CN105833862B - A kind of preparation method and application of nano oxidized platinum catalyst - Google Patents
A kind of preparation method and application of nano oxidized platinum catalyst Download PDFInfo
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 239000003054 catalyst Substances 0.000 title claims abstract description 56
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000243 solution Substances 0.000 claims abstract description 53
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims abstract description 33
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 28
- 229940049964 oleate Drugs 0.000 claims abstract description 21
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 150000003057 platinum Chemical class 0.000 claims abstract description 16
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims abstract description 12
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims abstract description 12
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims abstract description 12
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 12
- 239000005642 Oleic acid Substances 0.000 claims abstract description 12
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000084 colloidal system Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000012266 salt solution Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 16
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 12
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 claims description 12
- RCFVMJKOEJFGTM-UHFFFAOYSA-N cerium zirconium Chemical compound [Zr].[Ce] RCFVMJKOEJFGTM-UHFFFAOYSA-N 0.000 claims description 8
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 8
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 7
- NWAHZABTSDUXMJ-UHFFFAOYSA-N platinum(2+);dinitrate Chemical group [Pt+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O NWAHZABTSDUXMJ-UHFFFAOYSA-N 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims 1
- MUMZUERVLWJKNR-UHFFFAOYSA-N oxoplatinum Chemical compound [Pt]=O MUMZUERVLWJKNR-UHFFFAOYSA-N 0.000 abstract description 19
- 229910003446 platinum oxide Inorganic materials 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 12
- 239000011259 mixed solution Substances 0.000 abstract description 9
- 230000003197 catalytic effect Effects 0.000 abstract description 8
- 238000003756 stirring Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 235000011121 sodium hydroxide Nutrition 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 7
- 239000010970 precious metal Substances 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 150000004706 metal oxides Chemical class 0.000 description 4
- 229910000510 noble metal Inorganic materials 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000007872 degassing Methods 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 229910001868 water Inorganic materials 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910002621 H2PtCl6 Inorganic materials 0.000 description 1
- 229910019020 PtO2 Inorganic materials 0.000 description 1
- 230000010757 Reduction Activity Effects 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- YKIOKAURTKXMSB-UHFFFAOYSA-N adams's catalyst Chemical compound O=[Pt]=O YKIOKAURTKXMSB-UHFFFAOYSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 125000005211 alkyl trimethyl ammonium group Chemical group 0.000 description 1
- 229910002064 alloy oxide Inorganic materials 0.000 description 1
- SWLVFNYSXGMGBS-UHFFFAOYSA-N ammonium bromide Chemical compound [NH4+].[Br-] SWLVFNYSXGMGBS-UHFFFAOYSA-N 0.000 description 1
- HRHBQGBPZWNGHV-UHFFFAOYSA-N azane;bromomethane Chemical compound N.BrC HRHBQGBPZWNGHV-UHFFFAOYSA-N 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 description 1
- 229910000923 precious metal alloy Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
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- B01J35/20—Catalysts, in general, characterised by their form or physical properties characterised by their non-solid state
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- B01J35/61—Surface area
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Abstract
The invention discloses a kind of preparation method and applications of nano oxidized platinum catalyst, the specific steps are platinum salt solution is heated to 65 DEG C or so, then it is rapidly added oleate solution (oleic acid and excessive sodium hydroxide mixed solution), quickly 10 15min of stirring, obtain platinic hydroxide mixed solution, cetyl trimethylammonium bromide and 30% hydrogen peroxide is added into the solution again, stop reaction after 30 40min, nano oxidized Pt colloids solution is made, due to the presence of oleate and cetyl trimethylammonium bromide, nano oxidized platinum is uniformly dispersed in solution, AC100 is added into nano oxidized Pt colloids solution, RC25, the mixing drying of the materials such as RC35, it is sintered to 550 DEG C, nano oxidized platinum catalyst powder is made.The present invention improves specific surface area of the platinum oxide in catalyst material by preparing nanoscale platinum, and then improves platinum distributive law in the catalyst and service efficiency, achievees the purpose that make full use of and improve platinum oxide catalytic activity.
Description
Technical field
The invention belongs to catalytic field more particularly to a kind of preparation method and applications of nano oxidized platinum catalyst.
Background technology
Automobile exhaust gas purifying catalyst divides oxidation catalyst and one oxidation catalyst of reduction (three-way catalyst, Three-
WayCatalyst) two kinds.The seventies largely uses oxidation catalyst, into the eighties after large-scale popularization application ternary urge
Agent, by 1988, three-way catalyst accounted for 80%~90%.Using platinum or platinum palladium as active component, carrier is oxidation catalyst
γ-Al203 balls or added with γ-Al203.The ceramic honeycomb body of coating, function are nuisance CO and the HC conversions in being vented
For CO2 and water.For three-way catalyst using platinum rhodium as active component, carrier is the ceramic honeycomb added with γ-Al203 coatings, function
It is three kinds of nuisances (CO, HC and NOx) in being vented while eliminates, is changed into CO2, H2O and N2.
The catalytic performance and selectivity that precious metal oxide catalyst can not be substituted due to it, in oil, chemical industry, doctor
There is extremely important status in the fields such as medicine, pesticide, the energy.Especially in recent years, national economy develops rapidly, freeway net
All-round construction and living standard are greatly improved, and automobile gradually incorporates in people's daily life, are brought fast just for society
While sharp, a series of social concern is also brought, the discharge environmental pollution such as vehicle exhaust is serious, to a certain extent
It restricts the national economic development, endanger health of the masses as the key factor of social stability harmony is influenced.It is increasingly prominent in environmental problem
Go out with people to environmental protection pay attention to day by day under the new situation, motor vehicle exhaust emission problem increasingly cause society note that therefore
Using metal oxide containing precious metals as catalyst cleaning vehicle exhaust, the discharge of toxic gas is reduced, protects population health, promotes society
Meeting harmonious development is particularly important.Platinum oxide has excellent catalysis as a kind of typical precious metal oxide catalyst
Performance can largely reduce the toxic gas in motor vehicle exhaust emission, cause more and more to pay attention to, become car tail
Indispensable material in gas disposal accessory.Main material one of of traditional platinum oxide as catalyst, due to particle compared with
Greatly, the distribution specific surface area of the platinum oxide of equivalent in the catalyst is smaller, and the area contacted with gas is relatively fewer, and there are waves
The phenomenon that taking.Nano oxidized platinum since its scale is in nanometer scale there is larger specific surface area energy and higher catalysis to live
Property, therefore prepare nano oxidized platinum and can preferably reduce catalyst cost, save more Precious Metals Resources for country.
Traditional platinum-oxide catalyst making be a certain amount of platinum salt is made an addition to it is water-soluble by catalyst coat powder and weak acid
In the slurry of liquid mixed preparing and it is coated on catalyst support surface, the carrier for being then coated with catalyst is heated to 500 DEG C
It is sintered above.In sintering process, oxidized be changed into of platinum salt in slurry is attached to catalyst support surface and has
Nano oxidized platinum catalyst is made in the oxidation platinum particles of catalytic action.Presently, there are platinum oxide preparation method be by chloroplatinic acid
(H2PtCl6) or the congruent melting preparation at 500 DEG C of ammonium chloroplatinate [(NH4) 2PtCl6] and sodium nitrate.Earliest by Luo Jie Adams and
His student V.Voorhees is made.Platinum nitrate is first generated in the method, the latter decomposes to give off nitrogen oxides and oxygen again, must aoxidize
Platinum, the platinum oxide that this method is made not are nanoscale, and the characteristic of many nano materials can not embody in catalyst material
Come.
At a high temperature of oxidation platinum particles prepared by conventional method are formed in sintering process, atom is easy between different platinum particles
It spreads, therefore the platinum oxide in the catalyst support coatings of this method preparation is relatively large in diameter due to mutually bonding particle, about
It is hundreds of nanometers to tens microns, and may be sintered with other precious metal elements (such as rhodium) and form larger alloy body, this
The precious metal alloys catalytic activity that sample is formed is relatively weak, while this alloy and metal oxide containing precious metals are since particle is larger, ratio
Surface area is relatively small, will cause the noble metal of particle inner core part that can not be in direct contact with exhaust gas component, reduce noble metal
Effectively make full use of, cause waste in noble metal use.
Invention content
To solve the above problems, the present invention provides a kind of preparation method and applications of nano oxidized platinum catalyst.This hair
It is bright to improve specific surface area of the platinum oxide in catalyst material by preparing nanoscale platinum, and then improve platinum and be catalyzed
Distributive law in agent and service efficiency achieve the purpose that make full use of and improve platinum oxide catalytic activity.
To reach above-mentioned technique effect, the technical scheme is that：
A kind of preparation method of nano oxidized platinum catalyst, includes the following steps:Platinum salt is reacted into life with oleate solution
At platinic hydroxide mixed solution, cetyl trimethylammonium bromide is added in platinic hydroxide mixed solution and hydrogen peroxide carries out oxygen
Change reaction and nano oxidized Pt colloids solution is made.
Further to improve, the oleate solution is the mixed solution of oleic acid and sodium hydroxide, the PH of oleate solution
≥10。
It is further to improve, include the following steps：
Platinum salt solution is obtained Step 1: platinum salt is dissolved in deionized water, platinum salt solution is heated to 65 DEG C or so；
Step 2: preparing oleate solution：Fully dissolving then addition oleic acid is added in deionized water in sodium hydroxide, is made
Oleic acid, which fully dissolves, obtains oleate solution；Wherein PH >=10 of oleate solution, the oleate solution are sodium oleate solution；
Step 3: sodium oleate solution addition platinum salt solution reaction is obtained platinic hydroxide solution；
Step 4: addition cetyl trimethylammonium bromide and hydrogen peroxide solution aoxidize instead in platinic hydroxide solution
Nano oxidized Pt colloids solution should be made；The wherein final concentration of 0.01mol/L-0.05mol/ of cetyl trimethylammonium bromide
L；
Step 5: cerium zirconium compound oxide is added in nano oxidized Pt colloids solution, mixing drying is made nano oxidized
Platinum catalyst powder.
Further to improve, in the step 1, platinum salt is platinum nitrate.
It is further to improve, in the step 4, the final concentration of 5%-10% of hydrogen peroxide.
Further to improve, in the step 5, cerium zirconium compound oxide includes AC100, RC25 and RC35；AC100、
The mass ratio of RC25 and RC35 is：2:1:1；The mass ratio of cerium zirconium compound oxide and nano oxidized platinum is：100：1；Wherein,
AC100 includes 96%Al2O3And 4%La2O3；RC25 includes 5%La2O3, 5%Y2O3, 60%CeO2And 30%ZrO2；RC35 packets
Include 5%La2O3, 5%Y2O3, 30%CeO2And 60%ZrO2。
Further to improve, in the step 5, the temperature of drying is 550 DEG C.
Further to improve, the nano oxidized platinum is used as three-way catalyst.
The purposes of nano oxidized platinum made from a kind of preparation method of above-mentioned nano oxidized platinum catalyst, which is characterized in that
The nano oxidized platinum is used as three-way catalyst.
Advantages of the present invention：
1. platinum oxide prepared by is nanoscale, therefore specific surface area is larger, and catalytic performance is stronger；
2. the mixing addition of oleate and cetyl trimethylammonium bromide (CTAB) can in nano oxidized platinum preparation process
To prevent the aggregation of nano particle, therefore the distributive law of platinum in the catalyst can be improved in the effective size for controlling nano particle
And service efficiency, to fully improve the service efficiency of noble metal platinum.
Description of the drawings
Fig. 1 is the micrograph of nano oxidized platinum precipitation；
Fig. 2 is that 550 DEG C of TPR experimental results of nano oxidized platinum and common platinum-oxide catalyst compare.
Specific implementation mode
It is illustrated below by way of specific implementation mode and in conjunction with attached drawing to technical scheme of the present invention.
Embodiment 1
It weighs 1.5g platinum nitrate powder to be put into 250mL deionized waters, is allowed to fully dissolve, obtains platinum nitrate solution；Claim
4g sodium hydroxides are measured, is put into the beaker for the deionized water for filling 50ml, is sufficiently stirred, obtain sodium hydroxide solution；It is configuring
4mL oleic acid is added in good sodium hydroxide solution, and beaker is placed in ultrasonic cleaner to be vigorously stirred keeps oleic acid fully molten
Solution, (in solution until no bulk oleic acid), obtains sodium oleate solution (oleate solution), (amount that NaOH is added needs to keep
PH >=10 of sodium oleate solution)；By the good 250ml platinum nitrate solutions of above-mentioned configuration be heated to 65 DEG C or so (also can room temperature into
Row), the sodium oleate solution of preparation is then rapidly added when stirring platinum nitrate solution, you can obtain platinic hydroxide and oleate is mixed
Solution is closed, 10min is persistently stirred, reaction is made to be more uniformly distributed；50ml (0.1mol/L) ten is successively added in platinic hydroxide solution
Six alkyl trimethyl ammonium bromides (CTAB) [wherein the final concentration of CTAB to be maintained at (between 0.01mol/L-0.05mol/L] and
30% hydrogen peroxide solution [final concentration of hydrogen peroxide will be maintained between 5%-10%] of 100ml stops reaction after 30min, obtains
Nano oxidized Pt colloids solution is obtained, can be washed at this time by absolute ethyl alcohol, the nano oxidized platinum precipitation (see Fig. 1) of centrifugation acquisition,
Drying is sealed, and in addition to this, nano oxidized platinum is uniformly dispersed in colloidal solution at this time, and cerium is added into colloidal solution
Zirconium mixed oxide, i.e.,：50gAC-100 (96%Al2O3, 4%La2O3), 25gRC-25 (5%La2O3, 5%Y2O3, 60%
CeO2, 30%ZrO2), 25gRC-35 (5%La2O3, 5%Y2O3, 30%CeO2, 60%ZrO2) three kinds of materials, after being sufficiently stirred,
Drying, is sintered to 550 DEG C, and nano oxidized platinum catalyst powder, the wherein matter of cerium zirconium compound oxide and nano oxidized platinum is made
Measuring ratio is：100：1.Nano oxidized platinum catalyst made from this method can be preferably distributed in catalyst carrier, be obtained most
Good catalytic effect.Oxidation alloy platinum material made from the nano oxidized platinum catalyst material of making and ordinary sinter is subjected to TPR respectively
It tests (reaction of catalyst temperature programmed reduction), TPR tests unified parameters setting：Material weight range：Between 0.28-0.32g,
Reducing gas：5%H2+95%Ar, degassing gas：70%He+30%N2 (should use nitrogen or helium all can), degassing temperature
350 DEG C, 1.5 hours degassing time, gas flow is set as 80,30 DEG C/min of the rate of heat addition, and decaying shelves are adjusted to 64, sensor bridge
Stream IA is set as 150, He and H2 gas pressures are all adjusted to 0.07Mpa.
Experimental result Fig. 2 shows that nano oxidized platinum catalyst TPR tests the reduction of (reaction of catalyst temperature programmed reduction)
Peak area is significantly greater than the reduction peak of common platinum-oxide catalyst, it is seen then that catalyst reduction activity is apparently higher than common Platinum Nanoparticles.
In addition, the present invention nano oxidized platinum to the tolerance degree of high temperature obviously than the tolerance journey of common platinum-oxide catalyst
Degree is high.
The present invention prepares nano oxidized platinum using the precipitation method, in order to which the platinum oxide for overcoming the precipitation method to prepare is easy to form reunion
The phenomenon that body, is added oleate and cetyl trimethylammonium bromide (CTAB), prepares the nano oxidized platinum particles of monodisperse system, has
Body step：Platinum salt solution is heated to 65 DEG C or so first, is then rapidly added oleate solution (oleic acid and excessive hydroxide
Sodium mixed solution), 10-15min is quickly stirred, obtains platinic hydroxide mixed solution, then cetyl three is added into the solution
Methyl bromide ammonium (CTAB) and 30% hydrogen peroxide, stop reaction after 30-40min, nano oxidized Pt colloids solution be made, due to
The presence of oleate and cetyl trimethylammonium bromide (CTAB) surfactant, nano oxidized platinum are uniformly dispersed in colloid
It in solution, can be washed by absolute ethyl alcohol, centrifuge the nano oxidized platinum precipitation of acquisition, drying is sealed, and directly past can also be received
AC100 is added in rice platinum oxide colloidal solution, the mixing drying of the materials such as RC25, RC35 is sintered to 550 DEG C, is made nano oxidized
Platinum catalyst powder.
Reaction equation is as follows：
Pt(OH)4+4H2O2→PtO2+6H2O+2O2
By the way that platinum salt solution is heated to 65 DEG C or so in the present invention, it is then rapidly added excessive sodium hydrate and oleic acid
(molar ratio of sodium hydroxide and oleic acid is 8 to mixed solution:1) 10min, is quickly stirred, platinic hydroxide and oleate mixing are obtained
Solution, then cetyl trimethylammonium bromide (CTAB) and 30% hydrogen peroxide (cetyl trimethyl are added into the solution
Ammonium bromide addition is：The final concentration of CTAB will be maintained between (0.01mol/L)-(0.05mol/L), hydrogen peroxide it is final anti-
A concentration of 5%-10% is answered, stops reaction after 30min, nano oxidized Pt colloids solution is made, is finally added into colloidal solution
Cerium zirconium compound oxide：AC100 (96%Al2O3, 4%La2O3), RC25 (5%La2O3, 5%Y2O3, 60%CeO2, 30%
ZrO2), RC35 (5%La2O3, 5%Y2O3, 30%CeO2, 60%ZrO2) etc. materials mixing drying, be sintered to 550 DEG C, be made receive
Rice platinum-oxide catalyst powder.
Nanometer surfactant oleate and cetyl trimethylammonium bromide (CTAB's) is used in mixed way, and makes obtained receive
Rice platinum oxide property is stablized, and can preferably control granular size.
The specific guiding embodiment of the present invention is above are only, but the design concept of the present invention is not limited thereto,
All changes for carrying out unsubstantiality to the present invention using this design, should all belong to the behavior for invading protection scope of the present invention.
Claims (5)
1. a kind of preparation method for the nano oxidized platinum catalyst being used for three elementary reactions, which is characterized in that include the following steps：
Platinum salt solution is obtained Step 1: platinum salt is completely dissolved in deionized water, platinum salt solution is heated to 65 DEG C or so；
Step 2: preparing oleate solution：Fully dissolving then addition oleic acid is added in deionized water in sodium hydroxide, makes oleic acid
Fully dissolving obtains oleate solution；Wherein pH >=10 of oleate solution, the oleate solution are sodium oleate solution；
Step 3: sodium oleate solution addition platinum salt solution reaction is obtained platinic hydroxide solution；
Step 4: cetyl trimethylammonium bromide and hydrogen peroxide solution progress oxidation reaction system are added in platinic hydroxide solution
Obtain nano oxidized Pt colloids solution；The wherein final concentration of 0.01mol/L-0.05mol/L of cetyl trimethylammonium bromide；
Step 5: cerium zirconium compound oxide is added in nano oxidized Pt colloids solution, mixing drying is made nano oxidized platinum and urges
Agent powder；
Cerium zirconium compound oxide includes AC100, RC25 and RC35；The mass ratio of AC100, RC25 and RC35 is：2:1:1；Cerium zirconium
The mass ratio of composite oxides and nano oxidized platinum is：100：1；Wherein, AC100 includes 96%Al2O3And 4%La2O3；RC25
Including 5%La2O3, 5%Y2O3, 60%CeO2And 30%ZrO2；RC35 includes 5%La2O3, 5%Y2O3, 30%CeO2With 60%
ZrO2。
2. the preparation method for the nano oxidized platinum catalyst of three elementary reactions as described in claim 1, which is characterized in that institute
It states in step 1, platinum salt is platinum nitrate.
3. the preparation method for the nano oxidized platinum catalyst of three elementary reactions as described in claim 1, which is characterized in that institute
It states in step 4, the final concentration of 5%-10% of hydrogen peroxide.
4. the preparation method for the nano oxidized platinum catalyst of three elementary reactions as described in claim 1, which is characterized in that institute
It states in step 5, the temperature of drying is 550 DEG C.
5. a kind of purposes of the nano oxidized platinum catalyst described in claim 1 being used for three elementary reactions, which is characterized in that described
Nano oxidized platinum is used as three-way catalyst.
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