CN112044444A - Cobalt-aluminum catalyst modified by second main group element and preparation method and application thereof - Google Patents
Cobalt-aluminum catalyst modified by second main group element and preparation method and application thereof Download PDFInfo
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- CN112044444A CN112044444A CN202011052316.7A CN202011052316A CN112044444A CN 112044444 A CN112044444 A CN 112044444A CN 202011052316 A CN202011052316 A CN 202011052316A CN 112044444 A CN112044444 A CN 112044444A
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- cobalt
- aluminum
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- 239000003054 catalyst Substances 0.000 title claims abstract description 78
- BLJNPOIVYYWHMA-UHFFFAOYSA-N alumane;cobalt Chemical compound [AlH3].[Co] BLJNPOIVYYWHMA-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims abstract description 61
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims abstract description 43
- 229910001701 hydrotalcite Inorganic materials 0.000 claims abstract description 42
- 229960001545 hydrotalcite Drugs 0.000 claims abstract description 42
- 239000000725 suspension Substances 0.000 claims abstract description 27
- 238000007084 catalytic combustion reaction Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 150000003839 salts Chemical class 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 11
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 150000001868 cobalt Chemical class 0.000 claims abstract description 8
- 238000001354 calcination Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000002253 acid Substances 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 14
- 239000002585 base Substances 0.000 claims description 12
- DHEQXMRUPNDRPG-UHFFFAOYSA-N strontium nitrate Chemical compound [Sr+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O DHEQXMRUPNDRPG-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 10
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 claims description 10
- -1 preferably Chemical class 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910017052 cobalt Inorganic materials 0.000 claims description 9
- 239000010941 cobalt Substances 0.000 claims description 9
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000002425 crystallisation Methods 0.000 claims description 7
- 230000008025 crystallization Effects 0.000 claims description 7
- 239000002912 waste gas Substances 0.000 claims description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical group [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical group [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 claims description 6
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 6
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- 159000000009 barium salts Chemical class 0.000 claims description 4
- 159000000007 calcium salts Chemical class 0.000 claims description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 4
- 159000000003 magnesium salts Chemical class 0.000 claims description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 4
- 159000000008 strontium salts Chemical class 0.000 claims description 4
- UBXAKNTVXQMEAG-UHFFFAOYSA-L strontium sulfate Chemical compound [Sr+2].[O-]S([O-])(=O)=O UBXAKNTVXQMEAG-UHFFFAOYSA-L 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims description 2
- 229910001626 barium chloride Inorganic materials 0.000 claims description 2
- 239000001110 calcium chloride Substances 0.000 claims description 2
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 2
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims description 2
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 2
- 229940044175 cobalt sulfate Drugs 0.000 claims description 2
- 229910000361 cobalt sulfate Inorganic materials 0.000 claims description 2
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 claims description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 2
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 229910001631 strontium chloride Inorganic materials 0.000 claims description 2
- AHBGXTDRMVNFER-UHFFFAOYSA-L strontium dichloride Chemical compound [Cl-].[Cl-].[Sr+2] AHBGXTDRMVNFER-UHFFFAOYSA-L 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 18
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 abstract description 10
- 239000002243 precursor Substances 0.000 abstract description 8
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 abstract description 8
- 230000003197 catalytic effect Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 239000012266 salt solution Substances 0.000 description 18
- 239000012670 alkaline solution Substances 0.000 description 16
- 239000008367 deionised water Substances 0.000 description 16
- 229910021641 deionized water Inorganic materials 0.000 description 16
- 230000000694 effects Effects 0.000 description 12
- 238000005406 washing Methods 0.000 description 9
- 239000003513 alkali Substances 0.000 description 8
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 8
- QGUAJWGNOXCYJF-UHFFFAOYSA-N cobalt dinitrate hexahydrate Chemical compound O.O.O.O.O.O.[Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QGUAJWGNOXCYJF-UHFFFAOYSA-N 0.000 description 8
- 238000001816 cooling Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 7
- 239000000460 chlorine Substances 0.000 description 7
- 229910052801 chlorine Inorganic materials 0.000 description 7
- 229910000510 noble metal Inorganic materials 0.000 description 7
- 229960001701 chloroform Drugs 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(2+);cobalt(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 229910001868 water Inorganic materials 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910001429 cobalt ion Inorganic materials 0.000 description 3
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000007853 buffer solution Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 1
- 229910017107 AlOx Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003444 anaesthetic effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- ZSIQJIWKELUFRJ-UHFFFAOYSA-N azepane Chemical compound C1CCCNCC1 ZSIQJIWKELUFRJ-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229940117389 dichlorobenzene Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 231100000025 genetic toxicology Toxicity 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 231100000171 higher toxicity Toxicity 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000000520 microinjection Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
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Classifications
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/78—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
-
- 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
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Catalysts (AREA)
Abstract
The invention belongs to the technical field of catalysts, and particularly relates to a cobalt-aluminum catalyst modified by a second main group element, and a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving cobalt salt, second main group element salt and aluminum salt, and uniformly mixing to obtain a suspension; (2) crystallizing the suspension liquid to obtain cobalt-aluminum hydrotalcite modified by the second main group element; (3) and calcining the obtained cobalt-aluminum hydrotalcite modified by the second main group element to obtain the catalyst. The invention adopts the cobalt-aluminum hydrotalcite modified by the second main group element as the precursor, can effectively control the defects of chloroform, carbon tetrachloride and the like generated by the cobalt-aluminum hydrotalcite derived composite oxide in the catalytic combustion of dichloromethane, has high catalytic activity and stability for the catalytic combustion of dichloromethane, and has low ignition temperature and low complete conversion temperature.
Description
Technical Field
The invention belongs to the technical field of catalysts, and particularly relates to a cobalt-aluminum catalyst modified by a second main group element, and a preparation method and application thereof.
Background
chlorine-Containing Volatile Organic Compounds (CVOCs), which are emitted in various industrial processes, can be roughly divided into aromatic chlorides, such as chlorobenzene, dichlorobenzene; examples of the chlorinated aliphatic hydrocarbon compounds include unsaturated chlorinated aliphatic hydrocarbons such as vinyl chloride and trichloroethylene, and saturated chlorinated aliphatic hydrocarbons such as methylene chloride and dichloroethane. Among various chlorine-containing organic compounds, methylene chloride seriously harms the environment and human health due to its anesthetic action and three-induced effects of genetic toxicology (mutagenic-carcinogenic-teratogenic). The catalyst for dichloromethane catalytic combustion is a supported noble metal (active components are noble metals such as Pt, Pd, Rh, Ru and the like) and non-noble metal oxide catalyst. The noble metal-loaded catalyst is expensive and low in abundance, and meanwhile, the noble metal-loaded catalyst is used for eliminating the chlorine poisoning and inactivation tendency and generating polychlorinated products with higher toxicity when the CVOCs are subjected to catalytic combustion, so that the wide application of the noble metal-loaded catalyst is limited. Non-noble metal oxide catalysts are a class of catalysts widely studied because of their good activity and low cost. The development of efficient and stable catalysts for catalytic combustion of dichloromethane is a problem to be solved urgently at present.
CN110327929A discloses a preparation method of a cobalt aluminum hydrotalcite derived composite oxide, which specifically comprises the following steps: (1) dissolving cobalt salt and aluminum salt in a solvent to obtain a salt solution, wherein the molar ratio of cobalt to aluminum is 1: 1-5: 1; then adding a certain amount of urea or hexamethyleneimine into the salt solution to obtain a mixed solution; (2) putting the mixed solution obtained in the step (1) into an oven for crystallization, wherein the crystallization temperature is 80-150 ℃, and the crystallization time is 6-24 hours, so as to obtain cobalt-aluminum hydrotalcite; (3) washing and drying the cobalt-aluminum hydrotalcite obtained in the step (2), and roasting at 400-550 ℃ for 3-6h to obtain a cobalt-aluminum hydrotalcite derived composite oxide, wherein the molar ratio of cobalt to aluminum is 1: 1-5: 1. when the cobalt-aluminum hydrotalcite catalyst prepared by the technical scheme is used for dichloromethane catalytic combustion, the catalyst has the advantages of low ignition temperature, low complete combustion temperature and the like, but when the dichloromethane catalytic combustion is carried out, the problems of trichloromethane, carbon tetrachloride and the like are easily generated, and unexpected negative effects are caused.
In conclusion, the prior art still lacks a cobalt-aluminum hydrotalcite catalyst which can solve the problems of chloroform, carbon tetrachloride and the like generated during catalytic combustion.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a cobalt-aluminum composite oxide catalyst modified by a second main group element, which is obtained by roasting cobalt-aluminum hydrotalcite modified by the second main group element as a precursor, so that the problems of trichloromethane, carbon tetrachloride and the like generated during catalytic combustion are solved.
In order to achieve the above objects, according to one aspect of the present invention, there is provided a method for preparing a cobalt-aluminum catalyst modified with a second main group element, comprising the steps of:
(1) dissolving cobalt salt, second main group element salt and aluminum salt, and uniformly mixing to obtain a suspension;
(2) crystallizing the suspension liquid to obtain cobalt-aluminum hydrotalcite modified by the second main group element;
(3) and calcining the cobalt-aluminum hydrotalcite to obtain the catalyst.
Preferably, the ratio of the amount of the cobalt element substance of the cobalt salt, the amount of the second main group element substance of the second main group element salt, and the amount of the aluminum element substance of the aluminum salt is (2-4): (1-2): (1-2).
Preferably, in the step (1), the pH of the suspension is adjusted to 8-10 by adding alkali and strong base weak acid salt, and the amount of the alkali is as follows: (amount of cobalt element substance + amount of second main group element substance + amount of aluminum element substance) ═ 1-3: (2-5), the strong base and weak acid salt: amount of substance of aluminum element ═ 1-2: (2-4). The amount of the alkali and the strong base and the weak acid salt is added to control the pH value of the whole solution and adjust the pH value of the final suspension to be between 8 and 10; when the pH is from 8 to 10, the formation of the hydrotalcite-forming structure is favored.
Preferably, the second main group element salt comprises one of magnesium salt, calcium salt, strontium salt and barium salt;
preferably, the magnesium salt is one of magnesium nitrate, magnesium chloride and magnesium sulfate;
preferably, the calcium salt is one of calcium nitrate, calcium chloride and calcium sulfate;
preferably, the strontium salt is one of strontium nitrate, strontium chloride and strontium sulfate;
preferably, the barium salt is barium nitrate or barium chloride.
Preferably, the cobalt salt is one of cobalt chloride, cobalt nitrate and cobalt sulfate.
Preferably, the aluminum salt is one of aluminum nitrate, aluminum sulfate or aluminum chloride.
Preferably, the alkali is potassium hydroxide or sodium hydroxide, and the strong alkali weak acid salt is sodium carbonate or potassium carbonate.
Preferably, the crystallization in the step (2) is to heat the suspension in an oven or an oil bath, wherein the heating temperature is 80-150 ℃, and the crystallization time is 6-24 h; the calcination in the step (3) is roasting for 3 to 6 hours at the temperature of between 400 and 550 ℃.
According to another aspect of the present invention, there is provided a cobalt-aluminum catalyst modified with a second main group element, prepared according to the above-mentioned preparation method.
According to another aspect of the present invention, there is provided a cobalt aluminum catalyst for catalytic combustion of waste gas containing chlorinated hydrocarbon, preferably, the chlorinated hydrocarbon is dichloromethane, the volume ratio of the chlorinated hydrocarbon in the waste gas containing chlorinated hydrocarbon is 0.05% to 5%, each gram of the cobalt aluminum catalyst catalyzes the waste gas containing chlorinated hydrocarbon by 5L to 60L per hour, the reaction pressure during the catalytic combustion is 0.1Mpa to 0.5Mpa, and the reaction temperature is 50 ℃ to 400 ℃.
The invention has the following beneficial effects:
(1) according to the invention, cobalt-aluminum hydrotalcite modified by a second main group element is used as a precursor, the cobalt-aluminum composite oxide catalyst modified by the second main group element is obtained by roasting, and through modification of the second main group element, divalent metal ions are added on the basis of the original binary metal composite oxide catalyst, so that charge imbalance is caused, acidity is increased, the cracking of carbon-chlorine bonds of pollutant molecules and the transfer of chlorine species in the catalytic combustion process of chlorine-containing organic pollutants are facilitated, and the generation of byproducts is inhibited while the activity of the catalyst is promoted;
(2) the invention can adjust the proportion of metal elements, change the composition of the sheet layer metal elements of the hydrotalcite, has different compositions and different ionic radiuses, can cause the distortion of the crystal structure of the catalyst, promote the increase of the surface area of the catalyst, can provide more active sites, and the divalent cobalt ions on the surface of the cobalt-based composite oxide catalyst are often active centers;
(3) according to the invention, alkali and strong base weak acid salt are added to form a buffer solution system, the pH value of the buffer solution system is adjusted to be 8-10, the formation of a hydrotalcite-generating structure is facilitated, and the stability of the ternary metal hydrotalcite can be improved;
(4) the catalyst prepared by the invention has the advantages of strong oxidation performance, large specific surface area, dual functions of acid and alkali, high thermal stability, strong water resistance, multiple active sites and the like, can provide more active sites, dual functions of acid and alkali and excellent redox performance, and is beneficial to the breakage of C-Cl bonds, C-H bonds and C-C bonds and the oxidation conversion of hydrocarbons.
(5) The catalyst prepared by the invention adopts air or oxygen-containing atmosphere as oxidant, has low ignition temperature and low complete combustion temperature, can stably convert methylene dichloride in waste gas into carbon dioxide, water and hydrogen chloride for a long time, and has no reduction of the activity of the catalyst.
Drawings
FIG. 1 is an XRD pattern of a cobalt aluminum hydrotalcite precursor modified with a second main group element according to the present invention.
Fig. 2 is an SEM image of a cobalt aluminum hydrotalcite-derived composite oxide of the present invention.
FIG. 3 is an XRD pattern of a cobalt aluminum hydrotalcite precursor modified by a second main group element according to the invention
FIG. 4 is a graph showing the effect of the catalytic stability of the catalyst of the present invention to methylene chloride.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
Example 1
A cobalt-aluminum catalyst modified by a second main group element is prepared by the following steps:
(1) dissolving 8.73g of cobalt nitrate hexahydrate, 3.85g of magnesium nitrate and 5.63g of aluminum nitrate in 50mL of deionized water, stirring to form a salt solution, dissolving 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, stirring to form an alkaline solution, quickly adding the alkaline solution into the salt solution, and uniformly mixing to obtain a suspension;
(2) heating the suspension in an oil bath at 80 ℃ for 24 hours under stirring, naturally cooling, filtering, and washing to obtain cobalt-aluminum hydrotalcite modified by the second main group element;
(3) the cobalt-aluminum hydrotalcite is baked in an oven at 110 ℃ for 24 hours and then baked at 500 ℃ for 4 hours to prepare Co2MgAlOxThe catalyst, in which x represents the uncertain amount of O in the final catalyst, is finally present in the form of oxides, without a completely defined stoichiometric ratio, the same applies hereinafter.
Example 2
The present embodiment is mainly different from embodiment 1 in that the second main group element is different, as described below;
a cobalt-aluminum catalyst modified by a second main group element is prepared by the following steps:
(1) dissolving 8.73g of cobalt nitrate hexahydrate, 3.54g of calcium nitrate and 5.63g of aluminum nitrate in 50mL of deionized water, stirring to form a salt solution, dissolving 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, stirring to form an alkaline solution, quickly adding the alkaline solution into the salt solution, and uniformly mixing to obtain a suspension;
(2) heating the suspension in an oil bath at 80 ℃ for 24 hours under stirring, naturally cooling, filtering, and washing to obtain cobalt-aluminum hydrotalcite modified by the second main group element;
(3) the cobalt-aluminum hydrotalcite is baked in an oven at 110 ℃ for 24 hours and then baked at 500 ℃ for 4 hours to prepare Co2CaAlOxA catalyst.
Example 3
The present embodiment is mainly different from embodiment 1 in that the second main group element is different, as described below;
a cobalt-aluminum catalyst modified by a second main group element is prepared by the following steps:
(1) dissolving 8.73g of cobalt nitrate hexahydrate, 3.17g of strontium nitrate and 5.63g of aluminum nitrate in 50mL of deionized water, stirring to form a salt solution, dissolving 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, stirring to form an alkaline solution, quickly adding the alkaline solution into the salt solution, and uniformly mixing to obtain a suspension;
(2) heating the suspension in an oil bath at 80 ℃ for 24 hours under stirring, naturally cooling, filtering, and washing to obtain cobalt-aluminum hydrotalcite modified by the second main group element;
(3) the cobalt-aluminum hydrotalcite is baked in an oven at 110 ℃ for 24 hours and then baked at 500 ℃ for 4 hours to prepare Co2SrAlOxA catalyst.
Example 4
The present example is different from example 3 mainly in that the molar ratios of the elements are different, specifically as follows;
a cobalt-aluminum catalyst modified by a second main group element is prepared by the following steps:
(1) dissolving 9.82g of cobalt nitrate hexahydrate, 2.38g of strontium nitrate and 5.63g of aluminum nitrate in 50mL of deionized water, stirring to form a salt solution, dissolving 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, stirring to form an alkaline solution, quickly adding the alkaline solution into the salt solution, and uniformly mixing to obtain a suspension;
(2) heating the suspension in an oil bath at 80 ℃ for 24 hours under stirring, naturally cooling, filtering, and washing to obtain cobalt-aluminum hydrotalcite modified by the second main group element;
(3) the cobalt-aluminum hydrotalcite is baked in an oven at 110 ℃ for 24 hours and then baked at 500 ℃ for 4 hours to prepare Co3SrAlOxA catalyst.
Example 5
The present example is different from example 3 mainly in that the molar ratios of the elements are different, specifically as follows;
a cobalt-aluminum catalyst modified by a second main group element is prepared by the following steps:
(1) dissolving 6.55g of cobalt nitrate hexahydrate, 4.76g of strontium nitrate and 5.63g of aluminum nitrate in 50mL of deionized water, stirring to form a salt solution, dissolving 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, stirring to form an alkaline solution, quickly adding the alkaline solution into the salt solution, and uniformly mixing to obtain a suspension;
(2) heating the suspension in an oil bath at 80 ℃ for 24 hours under stirring, naturally cooling, filtering, and washing to obtain cobalt-aluminum hydrotalcite modified by the second main group element;
(3) the cobalt-aluminum hydrotalcite is baked in an oven at 110 ℃ for 24 hours and then baked at 500 ℃ for 4 hours to prepare the CoSrAlOxA catalyst.
Example 6
The present example is different from example 3 mainly in that the molar ratios of the elements are different, specifically as follows;
a cobalt-aluminum catalyst modified by a second main group element is prepared by the following steps:
(1) dissolving 4.37g of cobalt nitrate hexahydrate, 6.35g of strontium nitrate and 5.63g of aluminum nitrate in 50mL of deionized water, stirring to form a salt solution, dissolving 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, stirring to form an alkaline solution, quickly adding the alkaline solution into the salt solution, and uniformly mixing to obtain a suspension;
(2) heating the suspension in an oil bath at 80 ℃ for 24 hours under stirring, naturally cooling, filtering, and washing to obtain cobalt-aluminum hydrotalcite modified by the second main group element;
(3) the cobalt-aluminum hydrotalcite is baked in an oven at 110 ℃ for 24 hours and then baked at 500 ℃ for 4 hours to prepare the CoSr2AlOxA catalyst.
Example 7
The present embodiment is mainly different from embodiment 1 in that the second main group element is different, as described below;
a cobalt-aluminum catalyst modified by a second main group element is prepared by the following steps:
(1) dissolving 8.73g of cobalt nitrate hexahydrate, 3.92g of barium nitrate and 5.63g of aluminum nitrate in 50mL of deionized water, stirring to form a salt solution, dissolving 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, stirring to form an alkaline solution, quickly adding the alkaline solution into the salt solution, and uniformly mixing to obtain a suspension;
(2) heating the suspension in an oil bath at 80 ℃ for 24 hours under stirring, naturally cooling, filtering, and washing to obtain cobalt-aluminum hydrotalcite modified by the second main group element;
(3) the cobalt-aluminum hydrotalcite is baked in an oven at 110 ℃ for 24 hours and then baked at 500 ℃ for 4 hours to prepare Co2BaAlOxA catalyst.
Comparative examples
Comparative example 1
The present example is mainly different from example 1 in that the second main group element is not added, as described below;
a cobalt-aluminum catalyst modified by a second main group element is prepared by the following steps:
(1) dissolving 8.73g of cobalt nitrate hexahydrate and 5.63g of aluminum nitrate in 50mL of deionized water, stirring to form a salt solution, dissolving 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, stirring to form an alkaline solution, quickly adding the alkaline solution into the salt solution, and uniformly mixing to obtain a suspension;
(2) heating the suspension in an oil bath at 80 ℃ for 24 hours under stirring, naturally cooling, filtering, and washing to obtain cobalt-aluminum hydrotalcite modified by the second main group element;
(3) the cobalt-aluminum hydrotalcite is baked in an oven at 110 ℃ for 24 hours and then baked at 500 ℃ for 4 hours to prepare Co2CaAlOxA catalyst.
And (5) testing and result analysis.
XRD and SEM topography testing. XRD patterns of the hydrotalcite and the derivative composite oxide thereof obtained in the examples are shown in the attached figures 1 and 3 respectively. As shown in the figure, the synthesized precursor has an obvious hydrotalcite structure, and the main body structure of the precursor is not obviously changed by adding the second main group elements. After roasting, the phase of the catalyst is changed, the cobalt-aluminum composite oxide and the cobalt-magnesium-aluminum composite oxide catalyst mainly have a cobaltosic oxide spinel structure, but the diffraction peak of the cobalt-magnesium-aluminum catalyst is widened, which shows that the specific surface area of the catalyst is increased. The composite oxide catalyst of cobalt-calcium-aluminum, cobalt-strontium-aluminum and cobalt-barium-aluminum has diffraction peaks of cobaltosic oxide spinel structure and diffraction peaks of second main group elements, which are caused by large ionic radius of calcium, strontium and barium, thereby causing distortion of crystal structure and having more defect sites.
2. And (4) performing catalytic test.
The catalysts prepared in examples 1 to 7 and comparative example 1 were subjected to methylene chloride combustion activity test on a fixed-bed microreactor (quartz with an inner diameter of 4 mm), and the amount of the catalyst was 200 mg. The dichloromethane is injected into a vaporization chamber by a 100 series KDS100 micro-injection pump of Stoelting company in America, and then is mixed with air to enter a reactor for combustion. The total flow is controlled by a mass flow meter, and the concentration of the dichloromethane is controlled at 1000 ppm. The reaction pressure was 0.1MPa, and the relationship between the conversion of methylene chloride and the reaction temperature is shown in the following Table, in which T10%, T50% and T90% are reaction temperatures required for the conversions to 10%, 50% and 90%, respectively. The maximum concentration of chloroform is the highest concentration of polychlorinated products detected when the catalyst is used in a catalytic combustion process of dichloromethane. The main reaction products of the catalyst for catalytic combustion of dichloromethane are carbon dioxide, water, hydrogen chloride and chlorine. The test results are shown in table 1 and fig. 4.
TABLE 1 catalytic combustion results of chloroform
Comparing examples 1-7 with comparative example 1, it can be seen that the catalyst prepared by the present invention uses cobalt aluminum hydrotalcite modified with a second main group element as a precursor, and the composite oxide catalyst is obtained after calcination, and the prepared catalyst has the advantages of strong oxidation performance, large specific surface area, dual functions of acid and base, high thermal stability, strong water resistance, many active sites, etc., so that the catalyst can provide more active sites, dual functions of acid and base, and excellent redox performance, and is beneficial to the breaking of C-Cl bond, C-H bond and C-C bond and the oxidative conversion of hydrocarbons, thereby improving the reaction activity and stability of catalyzing dichloromethane and the selectivity of products meeting the environment.
According to the invention, through the modification of the second main group element, namely through the modulation of the composition of the sheet metal element of the hydrotalcite, the ternary second main group element modified cobalt-aluminum composite oxide catalyst is obtained after roasting, divalent metal ions are added on the basis of the original binary metal cobalt-aluminum composite oxide catalyst, so that charge imbalance is caused, acidity is increased, the cracking of carbon-chlorine bonds and the transfer of chlorine species of pollutant molecules in the catalytic combustion process of chlorine-containing organic pollutants are facilitated, and the generation of byproducts is inhibited; meanwhile, the different ionic radii can cause the distortion of the crystal structure of the catalyst, promote the increase of the surface area of the catalyst and provide more active sites; in general, divalent cobalt ions on the surface of the cobalt-based composite oxide catalyst tend to be active centers, and the addition of divalent metal ions of the second main group element can increase the concentration of the divalent cobalt ions on the catalytic surface and increase the activity of the catalyst.
It can be seen from examples 3-6 that the hydrotalcite-derived composite oxide catalysts prepared with different molar ratios of cobalt, strontium and aluminum have different behaviors, such as light-off temperature (T:), for burning methylene chloride10) The temperature (T) at which the reaction rate is the fastest50) Complete conversion temperature (T)90) Andthe polychlorinated products have different selectivity, which is the result of the combined action of the redox performance and the acid performance of the catalyst in the catalytic combustion of dichloromethane, and the redox performance and the acid performance of the cobalt-strontium-aluminum composite oxides with different proportions are different, so the expressed effects are also different; in general, the cobalt aluminum hydrotalcite-derived composite oxide catalyst modified with Sr, a second main group element, showed better effects in both activity and selectivity than the comparative example.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A preparation method of a cobalt-aluminum catalyst modified by a second main group element is characterized by comprising the following steps:
(1) dissolving cobalt salt, second main group element salt and aluminum salt, and uniformly mixing to obtain a suspension;
(2) crystallizing the suspension liquid to obtain cobalt-aluminum hydrotalcite modified by the second main group element;
(3) and calcining the obtained cobalt-aluminum hydrotalcite modified by the second main group element to obtain the catalyst.
2. The production method according to claim 1, wherein a ratio of an amount of a cobalt element substance of the cobalt salt, an amount of a second main group element substance of the second main group element salt, and an amount of an aluminum element substance of the aluminum salt is (2-4): (1-2): (1-2).
3. The method according to claim 2, wherein the pH of the suspension is adjusted to 8 to 10 by adding a base and a weak acid salt of a strong base in the step (1), and the amount of the base is: (amount of cobalt element substance + amount of second main group element substance + amount of aluminum element substance) ═ 1-3: (2-5), the strong base and weak acid salt: amount of substance of aluminum element ═ 1-2: (2-4).
4. The method according to claim 1, wherein the second main group element salt comprises one of magnesium salt, calcium salt, strontium salt and barium salt;
preferably, the magnesium salt is one of magnesium nitrate, magnesium chloride and magnesium sulfate;
preferably, the calcium salt is one of calcium nitrate, calcium chloride and calcium sulfate;
preferably, the strontium salt is one of strontium nitrate, strontium chloride and strontium sulfate;
preferably, the barium salt is barium nitrate or barium chloride.
5. The method according to claims 1 to 4, wherein the cobalt salt is one of cobalt chloride, cobalt nitrate and cobalt sulfate.
6. The method according to claims 1 to 4, wherein the aluminum salt is one of aluminum nitrate, aluminum sulfate, or aluminum chloride.
7. The preparation method according to claim 3, wherein the base is potassium hydroxide or sodium hydroxide, and the strong base and weak acid salt is sodium carbonate or potassium carbonate.
8. The preparation method according to claim 1, wherein the crystallization in the step (2) is that the suspension is put into an oven or an oil bath for heating, the heating temperature is 80-150 ℃, and the crystallization time is 6-24 h; the calcination in the step (3) is roasting for 3 to 6 hours at the temperature of between 400 and 550 ℃.
9. A cobalt-aluminum catalyst modified with a second main group element, characterized by being prepared by the preparation method according to any one of claims 1 to 8.
10. The use of the cobalt-aluminum catalyst according to claim 9, wherein the use comprises catalytic combustion of waste gas containing chlorinated hydrocarbon, preferably, the chlorinated hydrocarbon is dichloromethane, the volume ratio of the chlorinated hydrocarbon in the waste gas containing chlorinated hydrocarbon is 0.05-5%, each gram of the cobalt-aluminum catalyst catalyzes the waste gas containing chlorinated hydrocarbon in 5-60L per hour, the reaction pressure during the catalytic combustion is 0.1-0.5 Mpa, and the reaction temperature is 50-400 ℃.
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| CN113877587A (en) * | 2021-11-10 | 2022-01-04 | 哈尔滨工业大学 | Preparation method and application of flaky cobalt-yttrium-aluminum ternary composite catalyst |
| CN113877587B (en) * | 2021-11-10 | 2024-01-05 | 哈尔滨工业大学 | Preparation method and application of flaky cobalt-yttrium-aluminum ternary composite catalyst |
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