WO2008067375A1 - Nox storage materials and traps resistant to thermal aging - Google Patents
Nox storage materials and traps resistant to thermal aging Download PDFInfo
- Publication number
- WO2008067375A1 WO2008067375A1 PCT/US2007/085759 US2007085759W WO2008067375A1 WO 2008067375 A1 WO2008067375 A1 WO 2008067375A1 US 2007085759 W US2007085759 W US 2007085759W WO 2008067375 A1 WO2008067375 A1 WO 2008067375A1
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- WO
- WIPO (PCT)
- Prior art keywords
- oxide
- particles
- ceria
- catalyst
- ceria particles
- Prior art date
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- 239000011232 storage material Substances 0.000 title claims abstract description 44
- 238000003878 thermal aging Methods 0.000 title description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 99
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims abstract description 91
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims abstract description 90
- 230000003197 catalytic effect Effects 0.000 claims abstract description 80
- 239000002245 particle Substances 0.000 claims abstract description 69
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 9
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 65
- 239000003054 catalyst Substances 0.000 claims description 52
- 238000003860 storage Methods 0.000 claims description 38
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 34
- 239000000446 fuel Substances 0.000 claims description 24
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 229910052788 barium Inorganic materials 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000576 coating method Methods 0.000 claims description 17
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 15
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 15
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 15
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 15
- 230000032683 aging Effects 0.000 claims description 14
- 239000011148 porous material Substances 0.000 claims description 12
- 229910044991 metal oxide Inorganic materials 0.000 claims description 9
- 150000004706 metal oxides Chemical class 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000010948 rhodium Substances 0.000 claims description 9
- 238000001694 spray drying Methods 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 9
- 229910052697 platinum Inorganic materials 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 8
- 241000907788 Cordia gerascanthus Species 0.000 claims description 7
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052703 rhodium Inorganic materials 0.000 claims description 7
- 229910052763 palladium Inorganic materials 0.000 claims description 6
- -1 platinum group metals Chemical class 0.000 claims description 6
- 239000003870 refractory metal Substances 0.000 claims description 6
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 4
- 229910052741 iridium Inorganic materials 0.000 claims description 3
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 3
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical group [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 102
- 239000002002 slurry Substances 0.000 description 11
- 239000010970 precious metal Substances 0.000 description 10
- 229910002761 BaCeO3 Inorganic materials 0.000 description 9
- 239000002131 composite material Substances 0.000 description 9
- 239000002594 sorbent Substances 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 8
- 229910052746 lanthanum Inorganic materials 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 238000001354 calcination Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 238000000354 decomposition reaction Methods 0.000 description 7
- 238000005470 impregnation Methods 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 6
- 239000002243 precursor Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000010953 base metal Substances 0.000 description 5
- 229910052593 corundum Inorganic materials 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- ITHZDDVSAWDQPZ-UHFFFAOYSA-L barium acetate Chemical compound [Ba+2].CC([O-])=O.CC([O-])=O ITHZDDVSAWDQPZ-UHFFFAOYSA-L 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 229910026161 MgAl2O4 Inorganic materials 0.000 description 3
- 229910052777 Praseodymium Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910052596 spinel Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000011246 composite particle Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 150000002823 nitrates Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- DUFCMRCMPHIFTR-UHFFFAOYSA-N 5-(dimethylsulfamoyl)-2-methylfuran-3-carboxylic acid Chemical compound CN(C)S(=O)(=O)C1=CC(C(O)=O)=C(C)O1 DUFCMRCMPHIFTR-UHFFFAOYSA-N 0.000 description 1
- RRKXGHIWLJDUIU-UHFFFAOYSA-N 5-bromo-8-chloroisoquinoline Chemical compound C1=NC=C2C(Cl)=CC=C(Br)C2=C1 RRKXGHIWLJDUIU-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- 229910021523 barium zirconate Inorganic materials 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- UEGPKNKPLBYCNK-UHFFFAOYSA-L magnesium acetate Chemical compound [Mg+2].CC([O-])=O.CC([O-])=O UEGPKNKPLBYCNK-UHFFFAOYSA-L 0.000 description 1
- 235000011285 magnesium acetate Nutrition 0.000 description 1
- 239000011654 magnesium acetate Substances 0.000 description 1
- 229940069446 magnesium acetate Drugs 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910001960 metal nitrate Inorganic materials 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000018537 nitric oxide storage Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9422—Processes characterised by a specific catalyst for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)
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- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
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- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
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- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/391—Physical properties of the active metal ingredient
- B01J35/393—Metal or metal oxide crystallite size
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/613—10-100 m2/g
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/615—100-500 m2/g
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/63—Pore volume
- B01J35/633—Pore volume less than 0.5 ml/g
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/64—Pore diameter
- B01J35/647—2-50 nm
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- Embodiments of the invention relate to nitrogen oxide storage materials and methods for their manufacture. More particularly, embodiments of the invention pertain to NO storage materials that are resistant to thermal aging and methods of making such materials.
- the nitrogen oxide storage materials may be part of a catalytic trap used to treat exhaust gas streams, especially those emanating from lean-burn gasoline or diesel engines.
- NO x nitrogen oxides
- Conventional three-way conversion (“TWC") automotive catalysts are suitable for abating NO x , carbon monoxide a (“CO”) and hydrocarbon (“HC”) pollutants in the exhaust of engines operated at or near stoichiometric air/fuel conditions.
- CO carbon monoxide a
- HC hydrocarbon
- An air-to-fuel (“A/F”) ratio of 14.65:1 (weight of air to weight of fuel) is the stoichiometric ratio corresponding to the combustion of a hydrocarbon fuel, such as gasoline, with an average formula CHi.
- Engines especially gasoline-fueled engines to be used for passenger automobiles and the like, are being designed to operate under lean conditions as a fuel economy measure.
- Such future engines are referred to as “lean-burn engines”. That is, the ratio of air to fuel in the combustion mixtures supplied to such engines is maintained considerably above the stoichiometric ratio (e.g., at an air-to-fuel weight ratio of 18:1) so that the resulting exhaust gases are "lean", i.e., the exhaust gases are relatively high in oxygen content.
- lean-burn engines provide enhanced fuel economy, they have the disadvantage that conventional TWC catalysts are not effective for reducing NO x emissions from such engines because of excessive oxygen in the exhaust.
- Diesel engines provide better fuel economy than gasoline engines and normally operate 100% of the time under lean conditions, where the reduction of NOx is difficult due to the presence of excess oxygen.
- the catalyst/NOx sorbent is effective for storing NOx.
- a transient rich condition must be utilized to release / reduce the stored NOx to nitrogen.
- this transient reducing condition will require unique engine calibration or injection of a diesel fuel into the exhaust to create the next reducing environment.
- NO x storage (sorbent) components including alkaline earth metal oxides, such as oxides of Mg, Ca, Sr and Ba, alkali metal oxides such as oxides of Li, Na, K, Rb and Cs, and rare earth metal oxides such as oxides of Ce, La, Pr and Nd in combination with precious metal catalysts such as platinum dispersed on an alumina support have been used in the purification of exhaust gas from an internal combustion engine.
- alkaline earth metal oxides such as oxides of Mg, Ca, Sr and Ba
- alkali metal oxides such as oxides of Li, Na, K, Rb and Cs
- rare earth metal oxides such as oxides of Ce, La, Pr and Nd in combination with precious metal catalysts such as platinum dispersed on an alumina support
- precious metal catalysts such as platinum dispersed on an alumina support
- catalysts that use baria for NO x storage exhibit a problem in practical application, particularly when the catalysts are aged by exposure to high temperatures and lean operating conditions. After such exposure, such catalysts show a marked decrease in catalytic activity for NO x reduction, particularly at low temperature (200 to 350 0 C) and high temperature (450 0 C to 600°C) operating conditions.
- NO x absorbents that include baria suffer from the disadvantage that when exposed to temperatures above 450 0 C in the presence of CO2, barium carbonate forms, which becomes more stable than barium nitrate.
- barium tends to sinter and to form composite compounds with support materials, which leads to the loss of NO x storage capacity.
- NO x storage materials comprising barium fixed to ceria particles have been reported, and these NO x materials have exhibited improved thermal aging properties compared to the catalyst materials described above.
- improvements there is an ongoing need to improve the performance of NO x storage materials, particularly the ability of these materials to operate over a wide temperature range and to operate effectively after exposure to high temperature. It is also desirable to improve the kinetics of NO x oxidation (required in advance of NOx storage) and the kinetics of NOx reduction (required following NOx release) .
- NO x storage materials comprising barium fixed to ceria particles have been reported, and these NO x materials have exhibited improved thermal aging properties compared to the catalyst materials described above.
- aspects of the invention include nitrogen oxide storage materials, catalytic traps for the abatement of nitrogen oxide, methods for manufacturing both the nitrogen oxide storage materials and the catalytic traps for the abatement of nitrogen oxides, and methods of abating nitrogen oxide in an exhaust gas stream.
- the nitrogen oxide storage materials comprise ceria particles having alkaline earth oxides, for example, baria, supported on the particles, the ceria having a crystallite size of between about 10 and 20 nm and the alkaline earth oxides having a crystallite size of between about 20 and 40 nm.
- Other suitable alkaline earth oxides include oxides of Mg, Sr, and Ca.
- the composite particles have a BET surface area of between about 30 and 80 m2/g.
- a nitrogen oxide storage catalyst is provided comprising a coating on a substrate, the coating comprising a nitrogen oxide storage material comprising spray-dried ceria particles having baria supported on the particles.
- the coating of the nitrogen oxide storage catalyst further comprises at least one member of platinum group metals selected from the group consisting of platinum, palladium, rhodium, iridium and mixtures thereof supported on refractory oxide particles.
- the refractory oxide particles may be selected from the group consisting of aluminum oxide, mixed aluminum oxide and zirconium oxide, mixed aluminum oxide and lanthanum oxide, mixed aluminum oxide and cerium oxide, mixed aluminum oxide and magnesium oxide, and alumina oxide mixed with one or more of zirconia and lanthana.
- Another embodiment relates to a catalytic trap disposed in an exhaust passage of an internal combustion engine which operates periodically between lean and stoichiometric or rich conditions, for abatement of NOx in an exhaust gas stream which is generated by the engine.
- the catalytic trap comprises a catalytic trap material including a precious metal catalytic component effective for oxidizing NO to NO2 under lean conditions and promoting the reduction of released NO x to nitrogen under stoichiometric or rich conditions supported on a refractory metal oxide, and a NO x storage material effective for adsorbing the NO x under lean conditions and desorbing the NO x under stoichiometric or rich conditions, the NOx storage material comprising particles of ceria having alkaline earth carbonate supported on the ceria particles, having a crystallite size of between about 10 and 20 nm and the alkaline earth oxide having a crystallite size of between about 20 and 40 nm, and the catalytic trap material being disposed on a refractory carrier member.
- Still another embodiment relates to a method of making a nitrogen oxide storage material comprising mixing a solution of barium with ceria particles, spray drying the particles, heating the spray-dried particles, mixing the composite particles with a precious metal supported catalyst and coating the slurry mixture of particles on a substrate.
- Fig. 1 is a graph showing the nitrogen oxide conversion efficiency of a catalyst in accordance with an embodiment of the invention and a comparative reference catalyst;
- Fig. 2 is a graph comparing the nitrogen oxide storage capacity of various catalysts;
- Fig. 3 is a graph comparing the nitrogen oxide storage capacity of catalysts
- Fig 4 is a graph comparing the nitrogen oxide storage capacity of two catalysts
- Fig 5 is a graph comparing the nitrogen oxide storage capacity of two catalysts.
- Fig 6 is a SEM image of the spray dried and calcined
- a spray-dried NOx storage material comprising alkaline earth carbonate or mixtures of carbonates, for example, BaCO3 or mixtures of BaCO3 and MgCO3 supported on CeO2 particles is provided.
- the NOx storage material according to embodiments of the present invention demonstrates improved NOx storage capacity after thermal aging when used in a catalytic trap.
- methods of manufacturing NOx storage materials and catalytic traps including these storage materials are provided.
- Other embodiments of the invention pertain to a catalytic trap for abatement of NO x in an exhaust gas stream which is generated by an internal combustion engine which is operated periodically between lean and stoichiometric or rich conditions.
- the catalytic trap comprises a catalytic trap material including a catalytic component effective for promoting the reduction of NO x under stoichiometric or rich conditions supported on a refractory metal oxide and a NO x storage material effective for adsorbing the NO x under lean conditions and desorbing and reducing the NO x to nitrogen under stoichiometric or rich conditions, the NOx storage material comprising spray-dried particles of ceria having alkaline earth carbonate, for example, barium carbonate, supported on the ceria particles, the catalytic trap material being disposed on a refractory carrier member.
- Embodiments of this invention pertain to a process for abatement of NOx in an exhaust gas stream generated by an internal combustion engine which periodically operates alternately between lean and stoichiometric or rich conditions, comprising locating the above-described catalytic trap in an exhaust passage of the engine and treating the exhaust gas stream with a catalytic trap whereby at least some of the NOx in the exhaust gas stream is adsorbed by the catalytic trap during the periods of lean conditions and is desorbed from the catalytic trap and reduced to nitrogen during the periods of stoichiometric or rich conditions.
- the refractory metal oxide support of the catalytic trap may be porous in nature and has a high surface area such as alumina, for example, gamma-alumina.
- suitable support materials include titania, titania-alumina, zirconia, zirconia- alumina, baria-alumina, lanthana-alumina, lanthana-zirconia- alumina titania-zirconia, and mixtures thereof.
- the refractory metal oxide support will have a surface area of between about 5 and about 350 m2/g, and more particularly between about 100 and 200 m2/g.
- the support will be present on the coated substrate in the amount of about 1.5 to about 7.0 g/in3, for example between about 3 and 6 g/in3.
- a suitable support material for the precious metal is alumina, which may be doped with one or more other materials.
- the catalytic component preferably comprises a precious metal component, i.e., a platinum group metal component. Suitable precious metal components include platinum, palladium, rhodium and mixtures thereof.
- the catalytic component will typically be present in an amount of about 20 to about 200 g/ft3, more specifically, about 60 to 120 g/ft3.
- the NOx storage material employed in the catalytic trap according to embodiments of the present invention comprises a spray-dried NOx storage material comprising BaCO3 supported on CeO2 particles.
- the catalytic trap is disposed on a refractory carrier member.
- substrates include, for example, stainless steel, titanium, aluminum zirconate, aluminum titanate, aluminum phosphate, cordierite, mullite and corundum.
- the carrier member may be employed as a monolithic honeycomb structure, spun fibers, corrugated foils, layered materials, etc.
- a catalytic device employing a three-way conversion (“TWC") catalyst may be used in conjunction with the catalytic trap of the invention.
- TWC three-way conversion
- the TWC catalyst would typically include platinum, palladium and rhodium catalytic components dispersed on a high surface area refractory support and may also contain one or more base metal oxide catalytic components such as oxides of iron, manganese or nickel.
- Such catalysts can be stabilized against thermal degradation by expedients such as impregnating an activated alumina support with one or more rare earth metal oxides, e.g., ceria.
- Such stabilized catalysts can sustain very high operating temperatures. For example, if a fuel cut technique is utilized, temperatures as high as 1050 0 C may be sustained in the catalytic device.
- the catalytic device If the catalytic device is employed and is located upstream of the catalytic trap of the invention, the catalytic device would be mounted close to the exhaust manifold of the engine. In such an arrangement, the TWC catalyst would warm up quickly and provide for efficient cold start emission control. Once the engine is warmed up, the TWC catalyst will remove HC, CO and NOx from the exhaust gas stream during stoichiometric or rich operation and HC and CO during lean operation.
- the catalytic trap of the invention would be positioned downstream of the catalytic device where the exhaust gas temperature enables maximum NOx trap efficiency. During periods of lean engine operation, when NOx passes through the TWC catalyst, NOx is stored on the catalytic trap.
- the catalytic trap is periodically desorbed and the NOx is reduced to nitrogen under periods of stoichiometric or rich engine operation.
- a catalytic device containing a TWC catalyst may be employed downstream of the catalytic trap of the invention. Such catalytic device will serve to remove further amounts of HC and CO from the exhaust gas stream and, in particular, will provide for efficient reduction of the NOx to nitrogen under periods of stoichiometric or rich engine operation.
- the catalytic NOx-trap may be used in conjunction with a diesel oxidation catalyst (DOC) , and a catalyzed soot filter (CSF) ; where the DOC and CSF are placed either before or after the catalytic device of this invention.
- DOC diesel oxidation catalyst
- CSF catalyzed soot filter
- the several components of the catalytic trap material may be applied to the refractory carrier member, i.e., the substrate, as a mixture of two or more components or as individual components in sequential steps in a manner which will be readily apparent to those skilled in the art of catalyst manufacture.
- a typical method of manufacturing the catalytic trap of the present invention is to provide the catalytic trap material as a coating or layer of washcoat on the walls of the gas-flow passages of a suitable carrier member.
- This may be accomplished, by impregnating a fine particulate refractory metal oxide support material, e.g., gamma alumina, with one or more catalytic metal components such as a precious metal, i.e., platinum group, compound or other noble metals or base metals, drying and calcining the impregnated support particles and forming an aqueous slurry of these particles.
- a precious metal i.e., platinum group, compound or other noble metals or base metals
- Spray-dried particles of the bulk NOx sorbent may be included in the slurry.
- the NOx storage material or sorbent may be dispersed into the support, preferably in an impregnation operation, as described below.
- Activated alumina may be thermally stabilized before the catalytic components are dispersed thereon, as is well known in the art, by impregnating it with, e.g., a solution of a soluble salt of barium, lanthanum, zirconium, rare earth metal or other suitable stabilizer precursor, and thereafter drying (e.g., at 110 0 C for one hour) and calcining (e.g., at 550 0 C for one hour) the impregnated activated alumina to form a stabilizing metal oxide dispersed onto the alumina.
- a solution of a soluble salt of barium, lanthanum, zirconium, rare earth metal or other suitable stabilizer precursor e.g., a solution of a soluble salt of barium, lanthanum, zirconium, rare earth metal or other suitable stabilizer precursor, and thereafter drying (e.g., at 110 0 C for one hour) and calcining (e.g., at 550 0 C
- Base metal catalysts may optionally also have been impregnated into the activated alumina, for example, by impregnating a solution of a base metal nitrate into the alumina particles and calcining to provide a base metal oxide dispersed in the alumina particles.
- the carrier may then be immersed into the slurry of impregnated activated alumina and excess slurry removed to provide a thin coating of the slurry on the walls of the gas- flow passages of the carrier.
- the coated carrier is then dried and calcined to provide an adherent coating of the catalytic component and, optionally, the catalytic trap material, to the walls of the passages thereof.
- the carrier may then be immersed into a slurry of fine particles of component of the NOx storage material as a second or overlayer coating deposited over the layer of catalytic component.
- a magnesium component e.g., a solution of a magnesium salt such as magnesium nitrate, acetate, sulfate, hydroxide, etc., may be combined with the slurry of component of the NOx storage material or it may be applied as a third or overlayer coating deposited over the second layer of the NOx storage material.
- the carrier is then dried and calcined to provide a finished catalyst trap member in accordance with one embodiment of the present invention.
- the alumina or other support particles impregnated with the catalytic component may be mixed with bulk or supported particles of the NOx storage material in an aqueous slurry, and this mixed slurry of catalytic component particles and NOx storage material particles may be applied as a coating to the walls of the gas-flow passages of the carrier.
- the washcoat of catalytic component material after being dried and calcined, is immersed (post-dipped) into a solution of a component (NOx storage material precursor compound (or complex) and a magnesium precursor compound (or complex) to impregnate the washcoat with the NOx storage material precursor.
- the impregnated washcoat is then dried and calcined to provide the NOx storage material dispersed throughout the washcoat.
- washcoat may be applied in successive impregnating/drying/calcining operations, e.g., to provide a bottom washcoat layer containing a platinum catalytic component in a bottom washcoat layer and a palladium and/or rhodium catalytic component in a top washcoat layer.
- the NOx storage material may be dispersed by impregnation into both the top and bottom layers .
- the exhaust gas stream which is contacted with the catalytic trap of the present invention is alternately adjusted between lean and stoichiometric/rich operating conditions so as to provide alternating lean operating periods and stoichiometric/rich operating periods.
- the exhaust gas stream being treated may be selectively rendered lean or stoichiometric/rich either by adjusting the air-to-fuel ratio fed to the engine generating the exhaust or by periodically injecting a reductant into the gas stream upstream of the catalytic trap.
- the composition of the present invention is well suited to treat the exhaust of engines, including diesel engines, which continuously run lean.
- a suitable reductant such as fuel, may be periodically sprayed into the exhaust immediately upstream of the catalytic trap of the present invention to provide at least local (at the catalytic trap) stoichiometric/rich conditions at selected intervals.
- Partial lean-burn engines such as partial lean-burn gasoline engines, are designed with controls which cause them to operate lean with brief, intermittent rich or stoichiometric conditions.
- BaCO3 and CeO2 were intimately mixed and finely dispersed in a weight ratio of between about 1:3 and about 1:5.
- Cerium oxide having a BET surface area of between about 50-150 m2/g was mixed with a solution of barium acetate such that the BaCO3/CeO2 composite had a BaCO3 content of about 10-30 wt%.
- the suspension of soluble barium acetate and CeO2 was then spray-dried at a temperature of between about 90 0 C and 120 0 C to obtain a solid mixture of barium acetate and ceria.
- the mixture was then heated at about 550 0 C to 800 0 C for about 2 hours to form particles of ceria having barium carbonate supported on the ceria particles.
- the resulting BaCO3 had a crystallite size of between about 20 and 40 nm.
- the BaCO3 and CeO2 crystallites formed particles with a size of between about 5 and 50 microns.
- the BET surface area of the particulate mixture is between about 30 and 80 m2/g.
- a precious metal can be supported on a refractory oxide according to the following description.
- Pt and Rh are impregnated onto A12O3 by an incipient wetness procedure to yield 1.8 weight percent Pt and 0.1 weight percent Rh.
- Pd is impregnated separately onto alumina to a Pd loading of 1.4 weight percent.
- a slurry mixture containing about 34 wt% of alumina previously mixed with Pt/Rh, about 9 wt% Pd on alumina, a solution of zirconium acetate with a content of about 3 wt% ZrO2, magnesium acetate to yield 9 wt% MgO, and 45 wt% BaCO3/CeO2 spray-dried powder is milled at pH 6-8 until a particle size of 11 micron (d90) is obtained.
- Ceramic or metallic honeycomb substrates are coated with the slurry in a dip coating manner and then dried in a dryer and subsequently calcined in a furnace under air at about 450 0 C
- the coating procedure is then repeated until a loading of about 4 - 6.5 g/in3 is achieved.
- the coating on the honeycomb catalyst comprises about 3 - 30 micron BaCO3/CeO2 particles and about 1 -20 micron alumina particles.
- BaCO3 is fixed within the pores of the ceria particles in such a way that it does not migrate to the alumina particles. It is believed that the contact of BaCO3 and alumina would lead to the formation of inactive Ba/A12O3 composite compound formation upon aging, which has a reduced NOx storage capacity compared to BaCO3.
- catalytic traps Two catalytic traps were prepared, a first catalytic trap was prepared in accordance with Example 1 and a comparative catalytic trap was prepared in accordance with Comparative Example 2. Both catalytic traps A were evaluated after aging for 8 hours at 850 0 C.
- NOx NOx concentration (ppm)
- V volume flow (m3/h)
- V ldea i ideal molar volume (1/mol) at STP
- M 3 Molar weight of N02 (g/mol)
- dt time interval (s)
- Figure 1 demonstrates that the NOx storage capacity of catalytic trap prepared in accordance with Example 1 utilizing a spray-drying process exhibited superior capacity compared to the Comparative reference Example .
- Characterization of the impregnated powder included BET surface area measurement.
- fully formulated NOx trap catalysts were prepared using the procedures described in Example 1 that contain the particular Ba/Ceria composite material as NOx storage component.
- the NOx storage properties of the catalysts have been evaluated after aging for 8 hours at 850 0 C under air with 10% H20 in a laboratory reactor. The results are shown in Table I and Table II below.
- Table I shows the result of a variation of the BaCO3 and CeO2 concentration together with a variation of the ceria used. After impregnation, all samples were calcined at 550 0 C in air to decompose the impregnated Ba precursor into BaCO3. TABLE I
- sample C having a medium Ba concentration and a CeO2 material with a medium BET surface area and crystallinity .
- a high BET surface area and relative low Ba concentration is especially beneficial for NOx storage at 300 0 C. It is particularly interesting that sample D having the largest BaCO3 crystallite size after aging yields the best NOx storage at low temperature. In addition, increased Ba concentration resulted in decreased BET surface area and increase in CeO2 crystal size.
- the Ba/CeO2 is calcined after Ba impregnation at different temperatures. This is done to decompose the Ba precursor to the carbonate and to conditioning the composite for optimum NOx adsorption capacity.
- Table II demonstrates that a calcination temperature between 550 and 750 0 C after impregnation of Ba onto CeO2 provided the best results for NOx storage. The samples calcined within this temperature range had higher surface area and exhibited higher NOx storage after aging than a sample calcined at 850 0 C.
- a BaCO3 crystallite size of between about 20-50 nm, for example, 45 nm, and a CeO2 crystallite size of between about 25-30 nm in combination with a sufficient BET surface area after aging yielded the highest NOx storage at 400 0 C.
- Tables I and II an as-prepared BET surface area between 40-60 m2/g and a ceria crystal size between about 10- and 20 nm and a BaCO3 crystallite size of between about 20-and 40 nm yielded the best performance after aging.
- An example of a desirable morphology of spray dried and calcined BaCO3/CeO2 mixture is shown in the SEM image of Figure 6. Fig.
- Ceria Type and Doping [0050] Various types of ceria and doping with different materials were evaluated for effect on BET surface area and decomposition temperature of the barium carbonate.
- the decomposition temperature is the temperature at which Ba reacts with ceria to form BaCeO3.
- the samples below were prepared by an incipient wetness preparation instead of spray-drying prior to calcination. The results are shown in Table III:
- the preferred BaC03/Ce02/dopand material should have a BET surface area >10m2/g after aging and a high resistance towards reaction to BaCO3 as shown in table III.
- the support material for the precious metal tends to react with BaCO3 at a certain temperature. If this temperature for a specific material is reached most or all of the BaCO3 has formed a compound with the support material and this compound has much diminished tendency to adsorb NOx compared to BaCO3.
- ZrO2 doped aluminas and also La and ZrO2 doped materials have very thermally stable surface areas in presence of Ba.
- the preferred alumina should have a BET surface area of 150-250 m2/g, a pore volume of 0.3-
- Al2O3/ZrO2 derived temperature prepared 4h after thermal support + 15% BaO of BaCO3 ( 0 C) (m2/g) 900 0 C treatment
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CA2671020A CA2671020C (en) | 2006-11-29 | 2007-11-28 | Nox storage materials and traps resistant to thermal aging |
BRPI0719512A BRPI0719512B1 (en) | 2006-11-29 | 2007-11-28 | nitrogen oxide storage catalyst, catalytic pickup, and method for manufacturing a nitrogen oxide storage material. |
KR1020097013366A KR101391005B1 (en) | 2006-11-29 | 2007-11-28 | Nox storage materials and traps resistant to thermal aging |
ES07854809.6T ES2458499T5 (en) | 2006-11-29 | 2007-11-28 | Method for preparing a NOx storage material |
EP07854809.6A EP2104567B2 (en) | 2006-11-29 | 2007-11-28 | Method of making a NOx storage material |
MX2009005675A MX2009005675A (en) | 2006-11-29 | 2007-11-28 | Nox storage materials and traps resistant to thermal aging. |
JP2009539458A JP2010510884A (en) | 2006-11-29 | 2007-11-28 | Thermal aging resistant NOx storage materials and traps |
CN200780050588XA CN101610844B (en) | 2006-11-29 | 2007-11-28 | NOx storage materials and traps resistant to thermal aging |
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US11/564,494 US20080120970A1 (en) | 2006-11-29 | 2006-11-29 | NOx Storage Materials and Traps Resistant to Thermal Aging |
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WO2009158266A2 (en) * | 2008-06-27 | 2009-12-30 | Cabot Corporation | Process for producing exhaust treatment catalyst powders, and their use |
WO2010012677A1 (en) * | 2008-07-31 | 2010-02-04 | Basf Se | NOx STORAGE MATERIALS AND TRAPS RESISTANT TO THERMAL AGING |
JP2010260046A (en) * | 2009-04-07 | 2010-11-18 | Toyota Central R&D Labs Inc | Catalyst for cleaning exhaust gas |
WO2011015615A1 (en) | 2009-08-05 | 2011-02-10 | Basf Se | Treatment system for gasoline engine exhaust gas |
WO2011154912A1 (en) | 2010-06-10 | 2011-12-15 | Basf Se | Nox storage catalyst with reduced rh loading |
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Also Published As
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EP2104567B2 (en) | 2017-08-16 |
DE202007019493U1 (en) | 2013-04-10 |
ZA200904435B (en) | 2010-09-29 |
EP2644271A1 (en) | 2013-10-02 |
AR064038A1 (en) | 2009-03-11 |
JP2010510884A (en) | 2010-04-08 |
US8022010B2 (en) | 2011-09-20 |
KR101391005B1 (en) | 2014-04-30 |
US20120023915A1 (en) | 2012-02-02 |
EP2644271B1 (en) | 2017-08-30 |
BRPI0719512B1 (en) | 2018-12-11 |
BRPI0719512A2 (en) | 2013-12-31 |
CN101610844B (en) | 2013-03-20 |
ES2458499T3 (en) | 2014-05-05 |
CA2671020A1 (en) | 2008-06-05 |
DE202007019526U1 (en) | 2013-04-16 |
ES2650736T3 (en) | 2018-01-22 |
EP3257582A1 (en) | 2017-12-20 |
EP2104567B1 (en) | 2014-03-26 |
CN101610844A (en) | 2009-12-23 |
US8592337B2 (en) | 2013-11-26 |
US20090304564A1 (en) | 2009-12-10 |
RU2009124599A (en) | 2011-01-10 |
ES2458499T5 (en) | 2017-12-26 |
EP2104567A1 (en) | 2009-09-30 |
KR20090101913A (en) | 2009-09-29 |
US20080120970A1 (en) | 2008-05-29 |
CA2671020C (en) | 2016-06-21 |
MX2009005675A (en) | 2009-06-30 |
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