CN110586145B - Cerium-zirconium-aluminum composite material with high thermal stability, preparation method and application thereof - Google Patents
Cerium-zirconium-aluminum composite material with high thermal stability, preparation method and application thereof Download PDFInfo
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- CN110586145B CN110586145B CN201910831342.0A CN201910831342A CN110586145B CN 110586145 B CN110586145 B CN 110586145B CN 201910831342 A CN201910831342 A CN 201910831342A CN 110586145 B CN110586145 B CN 110586145B
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- -1 Cerium-zirconium-aluminum Chemical compound 0.000 title claims abstract description 105
- 239000002131 composite material Substances 0.000 title claims abstract description 70
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 32
- 239000010452 phosphate Substances 0.000 claims abstract description 32
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 32
- 238000001035 drying Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 20
- 150000000703 Cerium Chemical class 0.000 claims abstract description 18
- 239000003054 catalyst Substances 0.000 claims abstract description 18
- 150000003754 zirconium Chemical class 0.000 claims abstract description 18
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 9
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001392 phosphorus oxide Inorganic materials 0.000 claims abstract description 7
- VSAISIQCTGDGPU-UHFFFAOYSA-N tetraphosphorus hexaoxide Chemical compound O1P(O2)OP3OP1OP2O3 VSAISIQCTGDGPU-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001928 zirconium oxide Inorganic materials 0.000 claims abstract description 7
- 150000003017 phosphorus Chemical class 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000008367 deionised water Substances 0.000 claims description 23
- 229910021641 deionized water Inorganic materials 0.000 claims description 23
- 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 claims description 20
- OERNJTNJEZOPIA-UHFFFAOYSA-N zirconium nitrate Chemical compound [Zr+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O OERNJTNJEZOPIA-UHFFFAOYSA-N 0.000 claims description 20
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical group [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 12
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 12
- 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 11
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 11
- 229910000388 diammonium phosphate Inorganic materials 0.000 claims description 11
- 235000019838 diammonium phosphate Nutrition 0.000 claims description 11
- 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 claims description 5
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims description 5
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 5
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 5
- VGBWDOLBWVJTRZ-UHFFFAOYSA-K cerium(3+);triacetate Chemical compound [Ce+3].CC([O-])=O.CC([O-])=O.CC([O-])=O VGBWDOLBWVJTRZ-UHFFFAOYSA-K 0.000 claims description 5
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 5
- UJVRJBAUJYZFIX-UHFFFAOYSA-N nitric acid;oxozirconium Chemical compound [Zr]=O.O[N+]([O-])=O.O[N+]([O-])=O UJVRJBAUJYZFIX-UHFFFAOYSA-N 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
- 159000000013 aluminium salts Chemical class 0.000 claims description 2
- 229910000329 aluminium sulfate Inorganic materials 0.000 claims description 2
- HKVFISRIUUGTIB-UHFFFAOYSA-O azanium;cerium;nitrate Chemical compound [NH4+].[Ce].[O-][N+]([O-])=O HKVFISRIUUGTIB-UHFFFAOYSA-O 0.000 claims description 2
- DNXNYEBMOSARMM-UHFFFAOYSA-N alumane;zirconium Chemical compound [AlH3].[Zr] DNXNYEBMOSARMM-UHFFFAOYSA-N 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 23
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 8
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 48
- 238000001179 sorption measurement Methods 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 17
- 239000000126 substance Substances 0.000 description 14
- 238000002441 X-ray diffraction Methods 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 239000013078 crystal Substances 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 238000003860 storage Methods 0.000 description 11
- 239000012876 carrier material Substances 0.000 description 10
- 239000011259 mixed solution Substances 0.000 description 10
- RCFVMJKOEJFGTM-UHFFFAOYSA-N cerium zirconium Chemical compound [Zr].[Ce] RCFVMJKOEJFGTM-UHFFFAOYSA-N 0.000 description 9
- 239000010410 layer Substances 0.000 description 9
- 239000005696 Diammonium phosphate Substances 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 230000032683 aging Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003980 solgel method Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 239000002156 adsorbate Substances 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000002411 thermogravimetry Methods 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910017119 AlPO Inorganic materials 0.000 description 1
- 229910018512 Al—OH 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
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000006136 alcoholysis reaction Methods 0.000 description 1
- WLLURKMCNUGIRG-UHFFFAOYSA-N alumane;cerium Chemical compound [AlH3].[Ce] WLLURKMCNUGIRG-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000005180 public health Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
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- 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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- 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
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- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/14—Phosphorus; Compounds thereof
- B01J27/16—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr
- B01J27/18—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr with metals other than Al or Zr
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Abstract
The invention discloses a cerium-zirconium-aluminum composite material with high thermal stability, a preparation method and application thereof, relating to the technical field of catalytic materials, wherein the cerium-zirconium-aluminum composite material is expressed in an oxide form and comprises the following components: 40-90 wt% of alumina, 3-45 wt% of cerium oxide, 2-45 wt% of zirconium oxide and 1-10 wt% of phosphorus oxide. The material has large specific surface area and high temperature resistance, and can be used as an automobile exhaust catalyst carrier for application. The method for preparing the cerium-zirconium-aluminum composite material with high thermal stability comprises the steps of preparing a mixture A containing cerium salt, zirconium salt and aluminum salt in a liquid medium; adding a peptizing agent into the mixture A to obtain a sol B containing cerium salt, zirconium salt and aluminum salt; preparing a phosphate solution, adding the phosphate solution into the sol B, and stirring to obtain a sol C containing cerium salt, zirconium salt, aluminum salt and phosphorus salt; and standing the sol C at room temperature, and drying and roasting to obtain the cerium-zirconium-aluminum composite material with high thermal stability.
Description
Technical Field
The invention relates to the technical field of catalytic materials, in particular to a cerium-zirconium-aluminum composite material with high thermal stability, a preparation method and application thereof.
Background
With the rapid development of the automobile industry in China, the environmental problems caused by the emission of automobile exhaust become increasingly prominent. In recent years, air pollution is serious in China, and pollution indexes of a plurality of central cities such as Beijing, Shenyang, Xian, Hangzhou and the like are frequently 'burst table'. The atmospheric pollution weather such as haze brings huge threats to human living environment, public health, urban landscape and the like.
The motor vehicle tail gas post-treatment catalyst is a key part for controlling the emission of the tail gas of the automobile and is also the most effective technical means for controlling the emission of the automobile in the world at present. In order to accelerate the treatment of atmospheric pollution in China, the Ministry of environmental protection in 12 months in 2016 issued by the State quality inspection Bureau of light automobile pollutant emission limits and measurement methods (six stages in China), the national VI standard changes the I-type experiment test cycle, the pollutant emission limits are tightened, the durable mileage of the post-treatment catalyst is increased, and the actual driving pollutant emission test is determined as a II-type experiment. The change of national VI working conditions and the tightening of regulations bring huge pressure to post-treatment catalyst manufacturers, and the high-performance motor vehicle exhaust purification catalyst meeting the national VI standards relates to three preparation technologies of preparation of carrier materials with high oxygen storage, high temperature resistance and high specific surface area, loading of noble metals and auxiliaries and coating of durable coatings, and needs the synergistic improvement of all the processes.
Because the advantages of oxygen storage and release performance of the cerium-zirconium composite oxide and high specific area of alumina are combined at the same time, the cerium-zirconium-aluminum composite material with high thermal stability becomes a latest generation carrier material for the aftertreatment of the tail gas of the motor vehicle. The research of the document appl.Catal.B78(2008)210-220 shows that alumina in the cerium-zirconium-aluminum composite material with high thermal stability can form a diffusion barrier layer in the cerium-zirconium composite oxide, so that the aggregation and growth of the cerium-zirconium composite oxide particles at high temperature are inhibited, and meanwhile, the transformation of gamma and delta phases to alpha phases is prevented by the cerium-zirconium composite oxide.However, the best specific surface area of the cerium-aluminum-based composite material prepared by impregnating cerium oxide and a stabilizer thereof on alumina by an impregnation method disclosed in patent CN1200954A and roasting at 900 ℃/10 hours is only 30m 2 And about/g. The cerium-zirconium-aluminum composite oxide consisting of 51 wt% of alumina, 14.2 wt% of cerium oxide and 34.8 wt% of zirconium oxide reported in patent WO2006/070201 has a specific surface area of only 43m after 1100 ℃/2 hours of heat aging 2 (ii) in terms of/g. The patent CN101745375B discloses a cerium-zirconium-aluminum-based composite oxide material, which is composed of 25-70 wt% of alumina, 20-60 wt% of ceria, 5-25 wt% of zirconia, 2-4.9 wt% of lanthanum oxide and 2-15 wt% of one or more stabilizing additives selected from rare earth oxides of Y, Eu, Gd, Tb and Sm. After the material is roasted at 1000 ℃/10 hours, the specific surface area is only maintained at 50-75 m 2 Between/g. It can be seen that although the existing cerium-zirconium-aluminum material shows good application prospects in the aspects of thermal stability, high oxygen storage, high specific surface area and the like, the specific surface area of the existing cerium-zirconium-aluminum material is seriously reduced after being calcined at 1000 ℃/10 hours, the performance of the existing cerium-zirconium-aluminum material for keeping the high specific surface area under the condition of long time and high temperature, namely the heat-resistant stability performance, still cannot meet the requirement of a catalyst carrier material, and the existing cerium-zirconium-aluminum material cannot be used as the carrier material in a motor vehicle exhaust aftertreatment catalyst facing to the national VI or higher standard.
Disclosure of Invention
The invention aims to provide a cerium-zirconium-aluminum composite material with high thermal stability, a preparation method and application, so as to overcome the problem that the existing cerium-zirconium-aluminum composite material is insufficient in thermal stability and meet the ultra-long durable requirement of a future motor vehicle exhaust aftertreatment catalyst.
One aspect of the invention provides a cerium-zirconium-aluminum composite material with high thermal stability, which is expressed in an oxide form and comprises the following components in percentage by weight: 40-90 wt% of aluminum oxide, 3-45 wt% of cerium oxide, 2-45 wt% of zirconium oxide and 1-10 wt% of phosphorus oxide. The phosphate is combined with cerium, zirconium, aluminum and other elements to form CePO 4 、AlPO 4 The diffusion barrier layer is equal to the diffusion barrier layer, and the condensation of Al-OH and the agglomeration and sintering of CeZrOx in the aging process are inhibited, so that the cerium-zirconium aluminum material is obtainedThe specific surface area of the material is increased, and the aging resistance is enhanced. The cerium-zirconium-aluminum composite material with high thermal stability may contain, by weight, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90% of aluminum oxide, 3, 5, 10, 15, 20, 25, 30, 35, 40, 45% of cerium oxide, 2, 5, 10, 15, 20, 25, 30, 35, 40, 45% of zirconium oxide, and 1, 2, 3, 4, 5, 6, 7, 8, 9, 10% of phosphorus oxide, wherein the cerium-zirconium-aluminum composite material with high thermal stability has thermal stability in this range, and a high specific surface area can be maintained under high temperature conditions for a long time.
The further technical scheme is that the cerium-zirconium-aluminum composite material with high thermal stability is represented in an oxide form and comprises the following components: 40-60 wt% of aluminum oxide, 11-44 wt% of cerium oxide, 11-44 wt% of zirconium oxide and 5 wt% of phosphorus oxide. In a further technical scheme, the weight content of alumina in the cerium-zirconium-aluminum composite material with high thermal stability calculated by oxide can be 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59 and 60 percent; the cerium oxide may be present in an amount of 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45% by weight; the zirconia may be present in an amount of 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45% by weight; the content of the phosphorus oxide is preferably 5% by weight, including but not limited to the above range, in which the high thermal stability cerium-zirconium-aluminum composite material provided by the invention can not only maintain a large specific surface area under a high temperature condition for a long time, but also maintain a good oxygen storage capacity.
The invention also provides a preparation method of the cerium-zirconium-aluminum composite material with high thermal stability, which comprises the following steps:
s1: preparing a mixture a comprising a cerium salt, a zirconium salt and an aluminium salt in a liquid medium;
s2: adding a peptizing agent into the mixture A to obtain a sol B containing a cerium salt, a zirconium salt and an aluminum salt;
s3: preparing a phosphate solution, adding the phosphate solution into the sol B, and stirring to obtain a sol C containing cerium salt, zirconium salt, aluminum salt and phosphorus salt;
s4: and standing the sol C at room temperature, and drying and roasting to obtain the cerium-zirconium-aluminum composite material with high thermal stability.
Further, the step S1 specifically includes: and taking cerium salt, zirconium salt and aluminum salt, adding deionized water, and stirring to completely dissolve the cerium salt, the zirconium salt and the aluminum salt to obtain a mixture A.
In a further technical scheme, in the step S1, the cerium salt is one or more of cerium nitrate, ammonium cerium nitrate and cerium acetate; the zirconium salt is one or more of zirconium nitrate, zirconyl nitrate and zirconium acetate; the aluminum salt is one or more of aluminum nitrate and pseudo-boehmite.
According to a further technical scheme, in the step S2, the peptizing agent is ammonia water. The peptizing agent is used for dispersing insoluble matters into a colloid system by a chemical method. This is generally accomplished by adding a small amount of a suitable electrolyte, known as a peptizing agent, to the washed precipitate. Different peptizing substances require different peptizing agents, which are closely related to ions capable of being adsorbed on the crystal surfaces of the peptizing substances. Peptizers are also stabilizers of the formed colloids. The dispersion is stabilized due to the formation of an electric double layer around the colloidal particles.
Further technical solution is that step S3 specifically includes: and adding one or more of diammonium hydrogen phosphate and ammonium dihydrogen phosphate into deionized water to form a phosphate solution, adding the phosphate solution into the sol B, and stirring for 8-12 hours to obtain a sol C containing cerium salt, zirconium salt, aluminum salt and phosphorus salt. Adding phosphate solution into the sol B and stirring to make the phosphate solution fully dissolved and react with cerium salt, zirconium salt and aluminum salt to generate Ce-O-P, Zr-O-P, Al-O-P and other structures, wherein the stirring time can be 8, 9, 10, 11 and 12 hours, including but not limited to the above examples. When the stirring time is too short, the reaction is insufficient, and a stable chemical bond cannot be generated, so that the prepared cerium-zirconium-aluminum composite material has poor thermal stability.
Further technical solution is that step S4 specifically includes: and standing the sol C at the temperature of 20-30 ℃ for 12-24 hours, then drying the sol C in an oven at the temperature of 80-120 ℃, and finally roasting the sol C in a calciner at the temperature of 500-800 ℃ for 2-10 hours to obtain the cerium-zirconium-aluminum composite material with high thermal stability. And standing the sol C at the room temperature of 20-30 ℃, and standing at the temperature to obtain fine and stable crystal particles.
One aspect of the invention provides application of a cerium-zirconium-aluminum composite material with high thermal stability in the aftertreatment of automobile exhaust. For example, the cerium-zirconium-aluminum composite material with high thermal stability has large specific surface area and high temperature resistance, and can be used as a carrier material of a motor vehicle exhaust aftertreatment catalyst. When the cerium-zirconium-aluminum composite material is used as a carrier material of a motor vehicle exhaust aftertreatment catalyst, the cerium-zirconium-aluminum composite material with high thermal stability provided by the invention can be ground to obtain carrier material powder with a certain particle size, active metals Pt, Pd and Rh are loaded on the surface of the carrier material by a dipping method and a precipitation method independently or in combination with other cerium-zirconium materials, and then the carrier material powder is subjected to size mixing, coating and roasting to form the motor vehicle exhaust aftertreatment catalyst.
The invention takes phosphate solution as a thermal stability enhancing auxiliary agent to combine phosphorus with elements such as cerium, zirconium, aluminum and the like, thereby improving the aging resistance of the cerium-zirconium-aluminum material. The cerium-zirconium-aluminum material with enhanced thermal stability is prepared by adopting a sol-gel method. The sol-gel method is a method in which a certain salt is dissolved in water or other organic solvent to form a uniform salt solution, a sol is formed due to hydrolysis, alcoholysis, or a chelating reaction, and the sol is dried to become a gel. The loading of the active component of the catalyst prepared by the sol-gel method is accompanied with the sol-gel forming process, so that the chemical components of the catalyst prepared by the method are uniformly distributed. The material prepared by the invention has the advantages of single phase structure, large specific surface area, high-temperature environment resistance, simple preparation method and easily obtained raw materials, can be used as a carrier material of a motor vehicle exhaust aftertreatment catalyst, and is suitable for industrial production.
Drawings
FIG. 1 is a sample XRD pattern for fresh state of comparative example 1 and examples 1-3;
FIG. 2 is an XRD pattern of samples of comparative example 1 and examples 1-3 in the aged state.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to specific embodiments. It is to be understood that these descriptions are only illustrative and are not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Comparative example 1
294.3g of aluminum nitrate, 15.1g of cerium nitrate and 14.0g of zirconium nitrate are weighed and respectively added into deionized water to prepare 1mol/L solution. After the above solutions were mixed to prepare a cerium zirconium aluminum mixed solution, ammonia water having a concentration of 8 vol% was dropped at a flow rate of 10ml/min until the pH was 6.5. Standing at room temperature for 12h, drying the cerium-zirconium-aluminum sol in a 100 ℃ constant-temperature drying oven to constant weight, and then roasting in a muffle furnace at 500 ℃ for 3h to obtain a fresh-state high-thermal-stability cerium-zirconium-aluminum composite material. And roasting a part of fresh samples at 1000 ℃ for 10 hours to obtain the aged cerium-zirconium-aluminum composite material with high thermal stability.
Example 1
290.7g of aluminum nitrate, 15.1g of cerium nitrate and 14.0g of zirconium nitrate are weighed and respectively added into deionized water to prepare 1mol/L solution. After the above solutions were mixed to prepare a cerium-zirconium-aluminum mixed solution, ammonia water having a concentration of 8 vol% was added dropwise at a flow rate of 10ml/min until the pH was 6.5. 0.9g of diammonium phosphate is weighed and added into deionized water to prepare 1mol/L phosphate solution, and the phosphate solution is added into the cerium zirconium aluminum sol and stirred for 8 hours. Standing at room temperature for 12h, drying the cerium-zirconium-aluminum gel in a constant-temperature drying oven at 80 ℃ to constant weight, and then roasting in a muffle furnace at 500 ℃ for 3h to obtain the fresh cerium-zirconium-aluminum composite material with high thermal stability. And roasting a part of fresh samples at 1000 ℃ for 10 hours to obtain the aged cerium-zirconium-aluminum composite material with high thermal stability.
Example 2
275.9g of aluminum nitrate, 15.1g of cerium nitrate and 14.0g of zirconium nitrate are weighed and respectively added into deionized water to prepare 1mol/L solution. After the above solutions were mixed to prepare a cerium-zirconium-aluminum mixed solution, ammonia water having a concentration of 8 vol% was added dropwise at a flow rate of 10ml/min until the pH was 6.5. Weighing 4.7g of diammonium phosphate, adding the diammonium phosphate into deionized water to prepare 1mol/L phosphate solution, adding the phosphate solution into the cerium zirconium aluminum precipitated sol, and stirring for 10 hours. Standing at room temperature for 18h, drying the cerium-zirconium-aluminum gel in a constant-temperature drying oven at 100 ℃ to constant weight, and then roasting in a muffle furnace at 500 ℃ for 3h to obtain the fresh cerium-zirconium-aluminum composite material with high thermal stability. And roasting a part of fresh samples at 1000 ℃ for 10 hours to obtain the aged cerium-zirconium-aluminum composite material with high thermal stability.
Example 3
257.5g of aluminum nitrate, 15.1g of cerium nitrate and 14.0g of zirconium nitrate are weighed and respectively added into deionized water to prepare 1mol/L solution. After the above solutions were mixed to prepare a cerium zirconium aluminum mixed solution, ammonia water having a concentration of 8 vol% was dropped at a flow rate of 10ml/min until the pH was 6.5. 9.3g of diammonium phosphate is weighed and added into deionized water to prepare 1mol/L phosphate solution, and the phosphate solution is added into the cerium zirconium aluminum precipitated sol and stirred for 12 hours. Standing at room temperature for 24h, drying the cerium-zirconium-aluminum gel in a constant-temperature drying oven at 120 ℃ to constant weight, and then roasting in a muffle furnace at 500 ℃ for 3h to obtain the fresh cerium-zirconium-aluminum composite material with high thermal stability. And roasting a part of fresh samples at 1000 ℃ for 10 hours to obtain the aged cerium-zirconium-aluminum composite material with high thermal stability.
The crystal structure of the fresh samples of comparative example 1, example 2 and example 3 was characterized by X-ray diffraction technique. X-ray diffraction analysis (XRD) is mainly used for analyzing phase structure of catalyst, and prepared powder sample is placed on X' pert Pro type X-ray diffractometer for analysis, its working voltage is 36 kilovolt (kV), working current is 30 milliampere (mA), and Cu target and Ka radiation source are adopted
A graphite monochromator with a scanning range ofThe 2 theta is 5-90 degrees, the experimental scanning range is 10-90 degrees, the step length is 0.02 degree, and the scanning speed is 10 degrees/min. And, the obtained data can be subjected to phase analysis and grain size calculation using MID Jade 6.5. X-ray diffraction analysis is a structural analysis method for a substance by utilizing X-ray diffraction caused by crystal formation to spatially distribute internal atoms. When X-rays having a certain wavelength are irradiated onto a crystalline substance, the X-rays are scattered by encountering regularly arranged atoms or ions within the crystal, and the phase of the scattered X-rays is enhanced in some directions, thereby exhibiting a characteristic diffraction phenomenon corresponding to the crystal structure. The diffracted X-rays satisfy the bragg (w.l.bragg) equation: 2dsin θ ═ n λ formula: λ is the wavelength of the X-rays; θ is the diffraction angle; d is the crystal plane spacing; n is an integer. The wavelength λ can be measured by a known X-ray diffraction angle, and the plane spacing, that is, the regular arrangement state of atoms or ions in the crystal can be determined. The substance structure of the sample crystal can be determined by comparing the obtained diffraction X-ray intensity and surface spacing with a known table, and this is qualitative analysis.
The size of the grains can be calculated using the Scherrer equation as shown in equation (1):
in the formula: 1.θ is the half-peak width;
2.D hkl crystal grain diameter in the normal direction of the crystal plane;
k is a Scherrer constant, and when the general requirement is not high, k is taken as l;
4. lambda is the X-ray wavelength and is 0.154056 nm;
5. beta is the half-height width of the diffraction peak of the measured sample, and needs to be converted into radian (rad) in the calculation process.
The XRD pattern shown in fig. 1 was obtained by X-ray diffraction analysis, and as can be seen from fig. 1, the positions of diffraction peaks of examples 1 to 3 were consistent with those of comparative example 1, and characteristic peaks of cubic cerium-zirconium solid solution appeared at 28.6 °, 33.2 °, 47.7 ° and 56.7 ° for 2 θ, and γ -Al appeared at 65.6 ° for 2 θ 2 O 3 Characteristic peak of (2).Using Scherrer's formula, using midjade6.5 software to assist in grain size calculation, we found that the grain sizes of cerium zirconium solid solutions of fresh samples provided in comparative example 1, example 2, and example 3 were: the particle size was 7.6nm for comparative example 1, 6.7nm for example 1, 6.6nm for example 2 and 6.7nm for example 3. Thus, the high thermal stability cerium zirconium aluminum composite material prepared in examples 1 to 3 of the present invention has a smaller grain size.
Fig. 2 shows XRD spectra of the aged samples subjected to high temperature treatment provided in comparative example 1, example 2 and example 3. As can be seen from fig. 2, the cerium-zirconium-aluminum composite materials prepared in examples 1 to 3 and having high thermal stability in an aged state provided by the present invention have the same characteristic peaks as those of comparative example 1, and the main phase structure is a cubic cerium-zirconium solid solution structure. However, the phosphorus content is too high, so that the cerium-zirconium solid solution characteristic peak of tetragonal phase appears at 2 θ of 29.7 °. Using Scherrer formula, the grain size calculation was performed with the aid of MID Jade6.5 software, and the grain sizes of the aged samples provided in comparative example 1, example 2, and example 3 were: comparative example 1 was 9.2nm, example 1 was 8.1nm, example 2 was 7.9nm, and example 3 was 8.0 nm. Therefore, the cerium-zirconium-aluminum composite material with high thermal stability prepared in the embodiments 1 to 3 of the invention can keep smaller grain size after long-time high-temperature aging treatment, so that the cerium-zirconium-aluminum composite material with high thermal stability provided in the embodiments 1 to 3 of the invention has better high temperature resistance.
Example 4
40g of pseudo-boehmite, 33.5g of ammonium ceric nitrate and 14.2g of zirconyl nitrate are weighed and respectively added into deionized water to prepare 1mol/L solution. After the above solutions were mixed to prepare a cerium-zirconium-aluminum mixed solution, ammonia water having a concentration of 8 vol% was added dropwise at a flow rate of 10ml/min until the pH was 6.5. 4.1g of ammonium dihydrogen phosphate is weighed and added into deionized water to prepare 1mol/L phosphate solution, and then the phosphate solution is added into the cerium zirconium aluminum precipitated sol and stirred for 10 hours. Standing at room temperature for 12h, drying the cerium-zirconium-aluminum gel in a 100 ℃ constant-temperature drying oven to constant weight, and then roasting in a muffle furnace at 600 ℃ for 8h to obtain a fresh-state high-thermal-stability cerium-zirconium-aluminum composite material. And roasting a part of fresh samples at 1000 ℃ for 10 hours to obtain the aging-state high-thermal-stability cerium-zirconium-aluminum composite material.
Example 5
73.6g of aluminum nitrate, 20g of pseudo-boehmite, 24.9g of cerium acetate and 23.9g of zirconium acetate are weighed and respectively added into deionized water to prepare 1mol/L solution. After the above solutions were mixed to prepare a cerium-zirconium-aluminum mixed solution, ammonia water having a concentration of 8 vol% was added dropwise at a flow rate of 10ml/min until the pH was 6.5. 4.7g of diammonium phosphate is weighed and added into deionized water to prepare 1mol/L phosphate solution, and the phosphate solution is added into the cerium zirconium aluminum gel and stirred for 10 hours. Standing at room temperature for 12h, drying the cerium-zirconium-aluminum gel in a constant-temperature drying oven at 100 ℃ to constant weight, and then roasting in a muffle furnace at 800 ℃ for 10h to obtain the fresh cerium-zirconium-aluminum composite material with high thermal stability. And roasting a part of fresh samples at 1000 ℃ for 10 hours to obtain the aged cerium-zirconium-aluminum composite material with high thermal stability.
Example 6
147.2g of aluminum nitrate, 12g of cerium acetate, 25.2g of cerium nitrate and 29.3g of zirconium acetate are weighed and respectively added into deionized water to prepare 1mol/L solution. After the above solutions were mixed to prepare a cerium zirconium aluminum mixed solution, ammonia water having a concentration of 8 vol% was dropped at a flow rate of 10ml/min until the pH was 6.5. 4.7g of diammonium phosphate is weighed and added into deionized water to prepare 1mol/L phosphate solution, and the phosphate solution is added into the cerium zirconium aluminum gel and stirred for 10 hours. Standing at room temperature for 12h, drying the cerium-zirconium-aluminum gel in a constant-temperature drying oven at 100 ℃ to constant weight, and then roasting in a muffle furnace at 500 ℃ for 2h to obtain the fresh cerium-zirconium-aluminum composite material with high thermal stability. And roasting a part of fresh samples at 1000 ℃ for 10 hours to obtain the aged cerium-zirconium-aluminum composite material with high thermal stability.
Example 7
147.2g of aluminum nitrate, 55.5g of cerium nitrate, 10.5g of zirconium nitrate and 6.6g of zirconium nitrate are weighed and respectively added into deionized water to prepare 1mol/L solution. After the above solutions were mixed to prepare a cerium zirconium aluminum mixed solution, ammonia water having a concentration of 8 vol% was dropped at a flow rate of 10ml/min until the pH was 6.5. 4.7g of diammonium phosphate is weighed and added into deionized water to prepare 1mol/L phosphate solution, and the phosphate solution is added into the cerium zirconium aluminum gel and stirred for 10 hours. Standing at room temperature for 12h, drying the cerium-zirconium-aluminum gel in a 100 ℃ constant-temperature drying oven to constant weight, and then roasting in a muffle furnace at 700 ℃ for 5h to obtain a fresh-state high-thermal-stability cerium-zirconium-aluminum composite material. And roasting a part of fresh samples at 1000 ℃ for 10 hours to obtain the aged cerium-zirconium-aluminum composite material with high thermal stability.
Example 8
147.2g of aluminum nitrate, 13.9g of cerium nitrate, 17.4g of zirconium nitrate, 20.24g of zirconyl nitrate and 18.6g of zirconium acetate are weighed and respectively added into deionized water to prepare a 1mol/L solution. After the above solutions were mixed to prepare a cerium-zirconium-aluminum mixed solution, ammonia water having a concentration of 8 vol% was added dropwise at a flow rate of 10ml/min until the pH was 6.5. 1.9g of diammonium hydrogen phosphate and 2.4g of ammonium dihydrogen phosphate are weighed and added into deionized water to prepare 1mol/L phosphate solution, and the phosphate solution is added into the cerium zirconium aluminum gel and stirred for 10 hours. Standing at room temperature for 12h, drying the cerium-zirconium-aluminum gel in a constant-temperature drying oven at 100 ℃ to constant weight, and then roasting in a muffle furnace at 500 ℃ for 3h to obtain the fresh cerium-zirconium-aluminum composite material. And roasting a part of fresh samples at 1000 ℃ for 10 hours to obtain the aged cerium-zirconium-aluminum composite material.
Example 9
147.2g of aluminum nitrate, 33.3g of pseudo-boehmite, 1.3g of cerium nitrate, 1.6g of ammonium ceric nitrate, 0.9g of cerium acetate, 1.0g of zirconyl nitrate and 1.7g of zirconium nitrate are weighed and respectively added into deionized water to prepare 1mol/L solution. After the above solutions were mixed to prepare a cerium-zirconium-aluminum mixed solution, ammonia water having a concentration of 8 vol% was added dropwise at a flow rate of 10ml/min until the pH was 6.5. 1.9g of diammonium hydrogen phosphate and 2.4g of ammonium dihydrogen phosphate are weighed and added into deionized water to prepare 1mol/L phosphate solution, and the phosphate solution is added into the cerium zirconium aluminum gel and stirred for 10 hours. Standing at room temperature for 12h, drying the cerium-zirconium-aluminum gel in a 100 ℃ constant-temperature drying oven to constant weight, and then roasting in a muffle furnace at 800 ℃ for 2h to obtain a fresh-state high-thermal-stability cerium-zirconium-aluminum composite material. And roasting a part of fresh samples at 1000 ℃ for 10 hours to obtain the aging-state high-thermal-stability cerium-zirconium-aluminum composite material.
Evaluation of specific surface area and oxygen storage Properties was carried out using fresh samples and aged samples subjected to high-temperature long-time treatment as provided in comparative example 1 and examples 1 to 9, wherein the specific surface area was determined by N 2 The adsorption-desorption experiment is commonly used for characterizing the specific surface area and the pore structure of the catalystAnd (4) counting. The experiment was carried out on a NOVA model 2000e physical adsorption apparatus on high purity N 2 Cleaning the calibrated empty pipe by ultrasonic as an adsorbate, weighing the empty pipe to be empty after drying, then filling 0.1g of sample to be tested, degassing on an adsorption instrument, heating to 150 ℃ at 30 ℃/min after degassing is finished, keeping the temperature for 15min, and then weighing the total mass m of the pipe filled with the sample General assembly The mass m of the sample can be obtained Sample (A) ＝m General assembly -m Pipe And finally, selecting a proper program on the adsorption instrument to acquire adsorption and desorption data. The specific surface area (surface area per unit mass of the sample, in general m) was calculated from the collected data by the multipoint BET method 2 In terms of/g). Wherein the enrichment of molecules, atoms or ions etc. in the vicinity of the material interface can be called adsorption, wherein physical adsorption provides a method for determining the surface area, the average pore size and the pore size distribution of the catalyst support material, the BET adsorption theory is based on the Langmuir adsorption theory, and the basic assumption of the BET adsorption model is that:
(1) adsorption sites are homogeneous in the thermodynamic and kinetic sense (uniform surface properties of the adsorbent), the heat of adsorption being independent of surface coverage;
(2) the adsorption molecules have no interaction and no transverse interaction;
(3) adsorption may be multi-molecular and not necessarily complete with a monolayer followed by another;
(4) the first layer of adsorption is that gas molecules directly act on the surface of the solid, and the adsorption heat (E1) of the first layer of adsorption is different from that of the later layers of adsorption; the second and subsequent layers are the same gas molecules, and the heat of adsorption of each layer is the same, and is the heat of liquefaction (EL) of the adsorbate.
And the evaluation of oxygen storage performance is to adopt a thermogravimetric analyzer to collect H at 550 DEG C 2 The weight loss at constant temperature reduction was calculated. Wherein, the thermogravimetric Analyzer (TGA) is an instrument for detecting the temperature-mass change relationship of a substance by using thermogravimetry. Thermogravimetry is the measurement of the mass of a substance as a function of temperature (or time) at a programmed temperature. When the substance to be measured is sublimated, vaporized, decomposed to gas or lost during heatingWhen water is crystallized, the quality of the substance to be measured changes. The thermogravimetric curve is not a straight line but decreases. By analyzing the thermogravimetric curve, the change of the measured substance in degree can be known, and the lost substance can be calculated according to the weight loss.
The samples of comparative example 1 and examples 1-9 were measured as oxides with the weight percentages of alumina, ceria, zirconia, and phosphorous oxide in the samples shown in table 1. The cerium-zirconium-aluminum composite material with high thermal stability provided by the invention does not exist in the form of simple oxides, but exists in the form of salts with various complex structures, and the measurement by adopting an oxide method is used for simplifying a method for representing the composition of the cerium-zirconium-aluminum composite material with high thermal stability. The fresh state samples and the aged state samples of comparative example 1 and examples 1 to 9 were subjected to the above-described test methods, and the BET (specific surface area) and Oxygen Storage Capacity (OSC) of each sample were obtained, and the results are shown in table 1.
TABLE 1 evaluation of specific surface area and oxygen storage Properties in comparative example 1 and examples 1 to 9
As shown in Table 1, it can be seen that the cerium-zirconium-aluminum material sample provided in comparative example 1 has a specific surface area of 210m in the fresh state 2 (iv) g, the specific surface area of the aged cerium-zirconium-aluminum material sample after being calcined at 1000 ℃ for 10 hours is drastically reduced to 67m 2 (iv) g. It is thus seen that the high-temperature condition for a long time adversely affects the specific surface area of the conventional cerium-zirconium-aluminum material, which is an important index for evaluating the catalyst support material. In contrast, the specific surface area of the cerium-zirconium-aluminum composite material with high thermal stability provided by the embodiment of the invention can be kept in a better range after being roasted at 1000 ℃ for 10 hours, and the specific surface area is 230-341 m in a fresh state 2 The specific surface area of the sample roasted at 1000 ℃ for 10 hours can be maintained at 70-90 m 2 (ii) in terms of/g. Compared with the cerium zirconium aluminum material provided by the comparative example 1, the specific surface area and the oxygen storage capacity of the cerium zirconium aluminum materialThe amount is obviously improved. Compared with the existing cerium-zirconium-aluminum material, the cerium-zirconium-aluminum composite material with high thermal stability provided by the invention can still keep a better specific surface area after long-time high-temperature treatment, and has more excellent performance. The cerium-zirconium-aluminum composite material with high thermal stability provided by the embodiments 4 to 8 can also maintain a good oxygen storage amount under long-term high-temperature treatment, and the oxygen storage amount is reduced to 128 to 302 μmol/g less after being baked at 1000 ℃ for 10 hours.
It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (7)
1. A preparation method of a cerium-zirconium-aluminum composite material with high thermal stability is characterized in that the zirconium-aluminum composite material is expressed in an oxide form and comprises the following components: 40-90 wt% of aluminum oxide, 3-45 wt% of cerium oxide, 2-45 wt% of zirconium oxide and 1-10 wt% of phosphorus oxide, and the preparation method comprises the following steps:
s1: preparing a mixture a comprising a cerium salt, a zirconium salt and an aluminium salt in a liquid medium;
s2: adding a peptizing agent into the mixture A to obtain a sol B containing a cerium salt, a zirconium salt and an aluminum salt;
s3: preparing a phosphate solution, adding the phosphate solution into the sol B, and stirring for 8-12 hours to obtain a sol C containing cerium salt, zirconium salt, aluminum salt and phosphorus salt;
s4: standing the sol C at the temperature of 20-30 ℃ for 12-24 h, drying and roasting, and roasting in a roasting furnace at the temperature of 500-800 ℃ for 2-10 h; obtaining the cerium-zirconium-aluminum composite material with high thermal stability;
and in the step S2, the peptizing agent is ammonia water.
2. The method of claim 1, wherein the zirconium-aluminum composite material is represented in the form of oxide and has the following composition: 40-60 wt% of aluminum oxide, 11-44 wt% of cerium oxide, 11-44 wt% of zirconium oxide and 5 wt% of phosphorus oxide.
3. The method for preparing a cerium-zirconium-aluminum composite material with high thermal stability as claimed in claim 1 or 2, wherein the step S1 specifically comprises: and adding the cerium salt, the zirconium salt and the aluminum salt into deionized water, and stirring to completely dissolve the cerium salt, the zirconium salt and the aluminum salt to obtain a mixture A.
4. The method for preparing a cerium-zirconium-aluminum composite material with high thermal stability as claimed in claim 1 or 2, wherein in step S1, the cerium salt is one or more of cerium nitrate, ammonium cerium nitrate and cerium acetate; the zirconium salt is one or more of zirconium nitrate, zirconyl nitrate and zirconium acetate; the aluminum salt is one or more of aluminum nitrate and pseudo-boehmite.
5. The method for preparing a cerium-zirconium-aluminum composite material with high thermal stability according to claim 1 or 2, wherein the step S3 specifically comprises: and adding one or more of diammonium hydrogen phosphate and ammonium dihydrogen phosphate into deionized water to form a phosphate solution, adding the phosphate solution into the sol B, and stirring for 8-12 hours to obtain a sol C containing cerium salt, zirconium salt, aluminum salt and phosphorus salt.
6. The method for preparing a cerium-zirconium-aluminum composite material with high thermal stability according to claim 1 or 2, wherein the drying of step S4 is performed in an oven at a temperature of 80 to 120 ℃.
7. The application of the cerium-zirconium-aluminum composite material with high thermal stability prepared by the preparation method of claim 1 as a catalyst carrier for the aftertreatment of motor vehicle exhaust.
Priority Applications (1)
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