JP4630179B2 - 排気ガス浄化用触媒の製造方法 - Google Patents
排気ガス浄化用触媒の製造方法 Download PDFInfo
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- JP4630179B2 JP4630179B2 JP2005337091A JP2005337091A JP4630179B2 JP 4630179 B2 JP4630179 B2 JP 4630179B2 JP 2005337091 A JP2005337091 A JP 2005337091A JP 2005337091 A JP2005337091 A JP 2005337091A JP 4630179 B2 JP4630179 B2 JP 4630179B2
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- Prior art keywords
- catalyst
- exhaust gas
- pores
- storage material
- catalyst metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003054 catalyst Substances 0.000 title claims description 65
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 34
- 239000002184 metal Substances 0.000 claims description 34
- 239000011148 porous material Substances 0.000 claims description 31
- 239000011232 storage material Substances 0.000 claims description 28
- 238000000746 purification Methods 0.000 claims description 21
- 239000011164 primary particle Substances 0.000 claims description 20
- 239000011163 secondary particle Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000007872 degassing Methods 0.000 claims description 9
- 229910021645 metal ion Inorganic materials 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 229910052684 Cerium Inorganic materials 0.000 claims description 5
- 229910052726 zirconium Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 30
- 239000001301 oxygen Substances 0.000 description 22
- 229910052760 oxygen Inorganic materials 0.000 description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 20
- 239000000243 solution Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 239000000843 powder Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 7
- 238000011068 loading method Methods 0.000 description 7
- 239000011257 shell material Substances 0.000 description 7
- 230000003197 catalytic effect Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 229910000510 noble metal Inorganic materials 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000009849 vacuum degassing Methods 0.000 description 3
- 229910004625 Ce—Zr Inorganic materials 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- ITHZDDVSAWDQPZ-UHFFFAOYSA-L barium acetate Chemical compound [Ba+2].CC([O-])=O.CC([O-])=O ITHZDDVSAWDQPZ-UHFFFAOYSA-L 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- 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 2
- 238000010304 firing Methods 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- VXNYVYJABGOSBX-UHFFFAOYSA-N rhodium(3+);trinitrate Chemical compound [Rh+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VXNYVYJABGOSBX-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- RXSHXLOMRZJCLB-UHFFFAOYSA-L strontium;diacetate Chemical compound [Sr+2].CC([O-])=O.CC([O-])=O RXSHXLOMRZJCLB-UHFFFAOYSA-L 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- UJVRJBAUJYZFIX-UHFFFAOYSA-N nitric acid;oxozirconium Chemical compound [Zr]=O.O[N+]([O-])=O.O[N+]([O-])=O UJVRJBAUJYZFIX-UHFFFAOYSA-N 0.000 description 1
- UYXRCZUOJAYSQR-UHFFFAOYSA-N nitric acid;platinum Chemical compound [Pt].O[N+]([O-])=O UYXRCZUOJAYSQR-UHFFFAOYSA-N 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- NWAHZABTSDUXMJ-UHFFFAOYSA-N platinum(2+);dinitrate Chemical compound [Pt+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O NWAHZABTSDUXMJ-UHFFFAOYSA-N 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 238000005118 spray pyrolysis Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003764 ultrasonic spray pyrolysis Methods 0.000 description 1
Landscapes
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
上記二次粒子担体を触媒金属イオンの水溶液に分散させてなる懸濁液を、容器内で減圧脱気しつつ加熱することにより、水分を蒸発させ、触媒金属を上記二次粒子担体の表面及び上記細孔内に担持させる工程とを備えていることを特徴とする排気ガス浄化用触媒の製造方法である。
上記水溶液を上記触媒金属イオンとNOx吸蔵材となる金属イオンとの混合液とし、触媒金属及びNOx吸蔵材を上記二次粒子担体の表面及び細孔内に担持させることを特徴とする。
−実施例−
酸素吸蔵材を噴霧熱分解法によって調製した。すなわち、オキシ硝酸ジルコニウム、硝酸セリウム及び硫酸マグネシウムの各所定量を水に溶解させることにより、原料溶液を調製した(原料溶液調製)。ここで、硫酸マグネシウムは、中空状酸素吸蔵材を製造する際の一次粒子のシンタリングを抑制する、一次粒子同士の接触点を減らしつつ中空構造に導く、という作用を有するものとして、各種添加化合物の中から選定されたものであり、その添加量、濃度等は適宜決定することができる。
図1及び図2は実施例に係る酸素吸蔵材のTEM(透過型電子顕微鏡)写真である。この酸素吸蔵材は、図2に示すように、粒径が4〜10nmの一次粒子がシェル材となって凝集した中空状の二次粒子となったものであり、一次粒子間には孔径数nmの細孔が形成されている。
貴金属及びNOx吸蔵材の担持に、上記減圧脱気法に代えて常圧蒸発乾固法を採用する他は実施例と同じ方法で排気ガス浄化用触媒を得た。
酸素吸蔵材を平均粒径10nm未満の一次粒子が凝集した中実状(塊状)の二次粒子とする他は比較例1と同じ方法(常圧蒸発乾固)で排気ガス浄化用触媒を得た。触媒の組成は実施例と同じである。
上記実施例及び比較例1,2の各触媒について、大気雰囲気で750℃の温度に24時間保持するエージングを行なった後、モデルガス流通反応装置と排気ガス分析装置とを用いて、NOx浄化性能を調べた。
Claims (2)
- CeとZrとを含有する複酸化物よりなり且つ平均粒径10nm未満の一次粒子が凝集して内部に細孔を有するシェルが形成されている中空状の二次粒子担体を得る工程と、
上記二次粒子担体を触媒金属イオンの水溶液に分散させてなる懸濁液を、容器内で減圧脱気しつつ加熱することにより、水分を蒸発させ、触媒金属を上記二次粒子担体の表面及び上記細孔内に担持させる工程とを備えていることを特徴とする排気ガス浄化用触媒の製造方法。 - 請求項1において、
上記水溶液を上記触媒金属イオンとNOx吸蔵材になる金属イオンとの混合液とし、触媒金属及びNOx吸蔵材を上記二次粒子担体の表面及び上記細孔内に担持させることを特徴とする排気ガス浄化用触媒の製造方法。
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Publications (2)
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JP2007136421A JP2007136421A (ja) | 2007-06-07 |
JP4630179B2 true JP4630179B2 (ja) | 2011-02-09 |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002248347A (ja) * | 2001-02-23 | 2002-09-03 | Toyota Central Res & Dev Lab Inc | 複合酸化物粉末及び触媒とこれらの製造方法 |
JP2005334791A (ja) * | 2004-05-28 | 2005-12-08 | Toda Kogyo Corp | 排気ガス浄化用触媒及び同触媒用酸素吸蔵材 |
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2002248347A (ja) * | 2001-02-23 | 2002-09-03 | Toyota Central Res & Dev Lab Inc | 複合酸化物粉末及び触媒とこれらの製造方法 |
JP2005334791A (ja) * | 2004-05-28 | 2005-12-08 | Toda Kogyo Corp | 排気ガス浄化用触媒及び同触媒用酸素吸蔵材 |
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