CN104888767A - Noble metal oxide catalyst, and preparation and application thereof - Google Patents
Noble metal oxide catalyst, and preparation and application thereof Download PDFInfo
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Abstract
The invention relates to preparation and an application of a high-activity noble metal oxide catalyst. Active components of the catalyst comprise oxides of noble metals Ru, Ir and Rh, and a carrier is TiO2 or TiO2 modified SiO2, Al2O3, SnO2 cheap oxides. Through adjusting and changing the composition of different crystal forms of TiO2, strong interaction of the active noble metal oxides and TiO2 is improved, the dispersion degree of the noble metal oxides is significantly improved, and thus high-dispersion noble metal oxide catalyst with TiO2 or the TiO2 modified cheap oxides as the carrier is obtained. The method has the advantages of simple and easy implementation, convenient industrial production, extremely good repeatability and the like; prepared noble metal oxide particles are smaller in particle diameter and uniform in size. The catalyst has lower initial reaction temperature and high reaction stability in an N2O decomposition reaction, and has a good application prospect.
Description
Technical field
The invention belongs to catalyst preparation technical field, be specifically related to a kind of with TiO
2or through TiO
2the preparation method of the nano-noble metal oxide catalyst that the cheapness of modification is oxide carried, metal oxide containing precious metals (ruthenium-oxide, yttrium oxide, rhodium oxide) is active component, and is applied to nitrous oxide reaction.
Background technology
Nitrous oxide (N
2o) be a kind of main greenhouse gases, the environment of depending on for existence for the mankind causes very large destruction, thus seeks the N effectively eliminated in air
2o causes the very big concern of scientist; And, N
2o as a kind of novel green propellant, with the performance that it is superior, can cause the great interest of the scientists of space industry.Therefore, in the past few decades, scientist has done a large amount of research work, up to now, and research and development decomposing N
2the effective catalyst of O still has great importance in environmental protection and propellant.
Noble metal (Ru, Rh, Ir) is acknowledged as the effective catalyst dissociated to N-O key, thus becomes the N placed high hopes
2o decomposition catalyst.But, this type of noble metal, especially Ru, Ir are easily oxidized and generate oxide in oxidizing atmosphere, then agglomeration occur, and N
2inevitably O is had again in O decomposition reaction
2produce, this strongly limits simple substance noble metal catalyst at N
2the catalytic applications that O decomposes.Existing lot of documents report, the crystal structure adopting heat proof material, molecular sieve etc. stable is as perovskite, hexa-aluminate, MCM-41 etc., but owing to adopting these methods, the most noble metal as active specy is made to be embedded in these materials, greatly reduce the utilization ratio of noble metal, gained catalyst activity generally just can have good catalytic activity higher than 400 DEG C.
In addition, at N
2in O decomposition reaction, the activated centre of reaction is metallic state noble metal or its oxide, still disputable.Recently there are some researches show, titanium dioxide (TiO
2) ruthenium catalyst that supports is oxidized Cl processed at HCl
2reaction in there is good reactivity, author can be dispersed in TiO owing to ruthenium-oxide
2surface, and TiO
2and there is between ruthenium-oxide certain interaction.Although this seminar reported through H
2the Ir/TiO that high temperature reduction is obtained
2/ Al
2o
3catalyst (CN201010522923.5), its active component be metallic state Ir and catalyst temperature lower than when 250 DEG C without any activity.Up to the present, metal oxide containing precious metals (ruthenium-oxide, yttrium oxide, rhodium oxide), as active component, loads to TiO
2or through TiO
2the cheap oxide complex carrier of modification is applied to N
2o decomposition reaction, there is not been reported.
Summary of the invention
Technical problem solved by the invention is, provide a kind of low temperature namely have activity, stable performance, with TiO
2or through TiO
2the preparation method of nano-noble metal oxide (ruthenium-oxide, yttrium oxide, the rhodium oxide) catalyst that the cheapness of modification is oxide carried.
For achieving the above object, the technical scheme taked of the present invention is as follows:
Low temperature namely have activity, reactivity worth stable a nano-noble metal oxide catalyst, it is characterized in that: active component is one or two or more kinds in the oxide of noble metal Ru, Ir, Rh, carrier is TiO
2or through TiO
2the cheap oxide of modification, by modulation TiO
2different crystal forms composition, improve metal oxide containing precious metals and TiO
2between strong interaction, and then obtain the finely dispersed precious metal oxide catalyst at carrier surface.
The metal oxide containing precious metals of described catalyst accounts for the 1-55%(of vehicle weight content with elemental metal), TiO
2be 1:0-1:1 with the weight ratio of cheap oxide.
The concrete preparation process of catalyst of the present invention is as follows:
1) preparation of carrier:
The titanium dioxide of commercial rutile-type, Detitanium-ore-type or rutile and Detitanium-ore-type compound can be adopted (to be abbreviated as: F-TiO
2); Or prepare rutile, anatase by the hydrolysis of Ti salting liquid or there is the composite Ti O of different crystal forms composition
2carrier.
Also can adopt through TiO
2the cheap oxide carrier of modification, its preparation process is as follows: the Ti salting liquid of amount of calculation is placed in 0-80 DEG C of water-bath, when stirring, cheap oxide carrier is poured in Ti salting liquid, and drip aqueous slkali in Ti salting liquid, regulate solution ph and be maintained until 3-10, stir 2-6h, and leave standstill 2-6h, then filter rear 120 DEG C of oven dry, final 300-600 DEG C of calcining 2-12h;
2) preparation of active component precious metal oxide catalyst: adopt the infusion process improved, first regulate precious metal solution pH value and maintain 2-6, carrier is poured into, aging 1-10h is left standstill after mixing, after fully washing, 110 DEG C of oven dry, process 2-6h in oxidizing atmosphere at 200-500 DEG C, obtained finished catalyst;
The above-mentioned Ti salting liquid mentioned is TiCl
4, Ti (OC
4h
9)
4or Ti (SO
4)
2the aqueous solution in one or two or more kinds; Described precious metal solution is one or two or more kinds in ruthenium trichloride, nitryl nitric acid ruthenium, nitrosyl radical acetic acid ruthenium, acetylacetone,2,4-pentanedione ruthenium, rhodium chloride, rhodium nitrate, rhodium acetate, praseodynium rhodium, chloro-iridic acid; Described adjustment Ti salt and precious metal solution pH value aqueous slkali used comprise NH
3h
2o, Na
2cO
3, NaOH, K
2cO
3, KOH, (NH
4)
2cO
3in the aqueous solution of one or two or more kinds; Described oxidizing atmosphere is the one in air, air/nitrogen mixed gas, air/argon-mixed, air/helium gas mixture, oxygen/nitrogen mixed gas, oxygen/argon-mixed, oxygen/helium gas mixture.
Described precious metal oxide catalyst can be used for nitrous oxide reaction, can decomposing N at a lower temperature
2o also can keep its catalytic activity in long-time.
The application of described precious metal oxide catalyst in nitrous oxide reaction, its concrete reaction condition is: reaction gas consists of 0.5 ~ 60%N
2o, inert gas balances, reaction pressure normal pressure, reaction temperature 150-400 DEG C.
Catalyst of the present invention is a kind of very strong interaction based on existing between active component metal oxide containing precious metals (ruthenium-oxide, yttrium oxide, rhodium oxide) and titanium dioxide (a kind of composition in carrier or carrier).After in noble metal solution impregnated to carrier, under oxidizing atmosphere in heat treated process, due to the TiO in formed nanoscale precious metal oxide particle and carrier
2composition has very strong interaction, and nano-noble metal oxide particle is difficult to assemble sintering, thus prepares at carrier surface high degree of dispersion, uniform nanoscale precious metal oxide catalyst.And, strong interaction between metal oxide containing precious metals and carrier, the oxygen generated during nitrous oxide is reacted easier is transferred to carrier from precious metal surface and is carried out desorption, be conducive to the release of catalyst activity position and react again, thus greatly improving the reaction efficiency of nitrous oxide.
Compared with the prior art the present invention, has the following advantages:
1, in prepared catalyst, active component is Precious metal oxidation composition granule, eliminate before general catalyst uses and must activate the operation that this took time and effort, had potential safety hazard by hydrogen reducing, and preparation method is simple, prepared metal oxide containing precious metals grain diameter is less, is dispersed in carrier surface uniformly;
2, prepared precious metal oxide catalyst, namely have nitrous oxide activity at a lower temperature, catalytic efficiency is high;
3, prepared nanoscale precious metal oxide particle particle in nitrous oxide reaction does not find agglomeration, and the activity of reaction keeps stable, has good application prospect.
Accompanying drawing explanation
Fig. 1 is 5%RuO prepared by embodiment 1
2/ P25-TiO
2angle of elevation annular dark-scanning transmission charge pattern (HAADF-STEM) photo of ruthenium oxide catalysts;
Fig. 2 is 5%RuO prepared by embodiment 1
2/ P25-TiO
2ruthenium oxide catalysts is through 300
oc30%N
2angle of elevation annular dark after O decomposition reaction-scanning transmission charge pattern (HAADF-STEM) photo;
Fig. 3 is 15%RuO prepared by embodiment 2
2/ P25-TiO
2high resolution scanning Electronic Speculum (HRTEM) photo of ruthenium oxide catalysts;
Fig. 4 is 20%IrO prepared by embodiment 3
2/ P25-TiO
2high resolution scanning Electronic Speculum (HRTEM) photo of yttrium oxide catalyst;
Fig. 5 is 30%Rh prepared by embodiment 4
2o
3/ P25-TiO
2high resolution scanning Electronic Speculum (HRTEM) photo of rhodium oxide catalyst;
Fig. 6 is 5%RuO prepared by embodiment 5
2/ 20%Rutile-TiO
2/ Al
2o
3the TEM photo of ruthenium oxide catalysts;
Fig. 7 is 5%RuO prepared by embodiment 6
2/ 20%Rutile-TiO
2/ SiO
2the TEM photo of ruthenium oxide catalysts;
Fig. 8 is 5%RuO prepared by embodiment 7
2/ 20%Rutile-TiO
2/ SnO
2the TEM photo of ruthenium oxide catalysts;
Fig. 9 is 5%RuO prepared by embodiment 8
2/ 20%F-TiO
2/ Al
2o
3the TEM photo of ruthenium oxide catalysts;
Figure 10 is the F-TiO of rutile and the Detitanium-ore-type compound adopting the method in embodiment 8 and formula to prepare
2the XRD collection of illustrative plates of carrier;
Figure 11 is P25-TiO in application examples 1
2the 5%RuO supported
2, 5%Ru catalyst active testing result figure;
Figure 12 is P25-TiO in application examples 2
2the 5%RuO supported
2, 5%Rh
2o
3, 5%IrO
2the active testing result figure of catalyst;
Figure 13 is P25-TiO in application examples 3
2the 5%RuO supported
2, 5%Rh
2o
3, 5%IrO
2catalyst is at 30%N
2stability resolution chart in O decomposition reaction;
Detailed description of the invention
Embodiment 1
5%RuO
2/ P25-TiO
2the preparation of ruthenium oxide catalysts:
Under room temperature, measure RuCl
3solution (30.91gRu/L) 2.55mL, drips NaOH solution (1mol/L) and regulates solution ph to 3, then by 1.5009g P25-TiO
2carrier is poured into, and continues to stir 4h, leaves standstill aging 6h, after fully washing, in 110 DEG C of dry 10h, finally 300 DEG C in air roasting 4h obtain 5%RuO
2/ P25-TiO
2ruthenium-oxide finished catalyst;
Embodiment 2
20%RuO
2/ P25-TiO
2the preparation of ruthenium oxide catalysts:
Measure RuCl
3solution (30.91gRu/L) 12.1mL, is placed in 60 DEG C of water-baths, drips NaOH solution (3mol/L) and regulates solution ph to 4, then by 1.501gP25-TiO
2carrier pours mixing into, continues to stir after 6h, leaves standstill aging 6h, after abundant washing, in 110 DEG C of dry 8h, finally at 300 DEG C of roasting 4h thus obtain 20%RuO in 10% oxygen/nitrogen mixed gas
2/ P25-TiO
2ruthenium-oxide finished catalyst;
Embodiment 3
15%IrO
2/ P25-TiO
2the preparation of yttrium oxide catalyst:
Measure H
2irCl
6solution (Ir weight fraction 19.8wt.%) 0.8913g, drips NaOH solution (3mol/L) and regulates solution ph to 5, then by 1.001g P25-TiO
2carrier is poured into, continues to stir after 8h, leaves standstill aging 6h, after abundant washing, in 110 DEG C of dry 12h, finally obtains 15%IrO at 500 DEG C in 10% oxygen/argon-mixed middle roasting 4h
2/ P25-TiO
2yttrium oxide finished catalyst;
Embodiment 4
30%Rh
2o
3/ P25-TiO
2the preparation of rhodium oxide catalyst:
Take RhCl
3solution (Rh weight fraction 19.26wt.%) 2.2252g, drips NaOH solution (3mol/L) and regulates solution ph to 7, then by 1.003g P25-TiO
2carrier is poured into, stirs after 8h and leaves standstill aging 6h, after abundant washing, in 110 DEG C of dry 16h, finally at 600 DEG C of roasting 6h thus obtain 30%Rh in 10% oxygen/helium gas mixture
2o
3/ P25-TiO
2rhodium oxide finished catalyst;
Embodiment 5
5%RuO
2/ 20%Rutile-TiO
2/ Al
2o
3the preparation of ruthenium oxide catalysts:
Measure TiCl
4solution (0.91mol/L, containing HCl concentration 2mol/L) 3.06mL, in beaker, opens and stirs, drip NH in 50 DEG C of water-baths
3h
2o solution (3mol/L), to pH=4, then pours 2.001g Al into
2o
3carrier, leaves standstill 12h after continuing to stir 8h, by carrier 12 0 DEG C oven dry after filtration, and 600 DEG C of roasting 4h, i.e. obtained rutile TiO
2the 20%Rutile-TiO of modification
2/ Al
2o
3complex carrier;
Measure RuCl
3solution (30.91gRu/L) 2.55mL, drips NaOH solution (1mol/L) and regulates solution ph to 3, then by 1.5009g20%Rutile-TiO
2/ Al
2o
3carrier is poured into, stirs after 4h and leaves standstill aging 6h, after fully washing, in 110 DEG C of dry 12h, finally 300 DEG C in 5% oxygen/nitrogen mixed gas roasting 4h obtain 5%RuO
2/ 20%Rutile-TiO
2/ Al
2o
3finished product ruthenium oxide catalysts.
Embodiment 6
5%RuO
2/ 20%Rutile-TiO
2/ SiO
2the preparation of ruthenium oxide catalysts:
Measure TiCl
4solution (0.91mol/L, containing HCl concentration 2mol/L) 3.06mL, in beaker, opens and stirs, drip (NH in 50 DEG C of water-baths
4)
2cO
3solution (2mol/L), to pH=5, then pours 2.001g Al into
2o
3carrier, leaves standstill 12h after continuing to stir 8h, by carrier 12 0 DEG C oven dry after filtration, and 600 DEG C of roasting 4h, i.e. obtained rutile TiO
2the 20%Rutile-TiO of modification
2/ SiO
2complex carrier;
Measure RuCl
3solution (30.91gRu/L) 3.41mL, drips KOH solution (1mol/L) and regulates solution ph to 5, then by 2.001g20%Rutile-TiO
2/ SiO
2carrier is poured into, stirs after 4h and leaves standstill aging 6h, after fully washing, in 110 DEG C of dry 8h, finally 400 DEG C in 2% oxygen/nitrogen mixed gas roasting 4h obtain 5%RuO
2/ 20%Rutile-TiO
2/ SiO
2finished product ruthenium oxide catalysts.
Embodiment 7
5%RuO
2/ 20%Rutile-TiO
2/ SnO
2the preparation of ruthenium oxide catalysts:
Measure TiCl
4solution (0.91mol/L, containing HCl concentration 2mol/L) 3.06mL, in beaker, opens and stirs, drip Na in 50 DEG C of water-baths
2cO
3solution (2mol/L), to pH=3, then pours 2.001g SnO into
2carrier, leaves standstill 12h after continuing to stir 8h, by carrier 12 0 DEG C oven dry after filtration, and 600 DEG C of roasting 4h, i.e. obtained rutile TiO
2the 20%Rutile-TiO of modification
2/ SnO
2complex carrier;
Measure RuCl
3solution (30.91gRu/L) 2.55mL, drips KOH solution (1mol/L) and regulates solution ph to 5, then by 1.5008g20%Rutile-TiO
2/ SnO
2carrier is poured into, stirs after 4h and leaves standstill aging 6h, after fully washing, in 110 DEG C of dry 8h, finally 500 DEG C in 0.5% oxygen/nitrogen mixed gas roasting 6h obtain 5%RuO
2/ 20%Rutile-TiO
2/ SnO
2finished product ruthenium oxide catalysts.
Embodiment 8
5%RuO
2/ 20% (F-TiO
2)/Al
2o
3the preparation of ruthenium oxide catalysts:
Measure TiCl
4solution (0.91mol/L, containing HCl concentration 2mol/L) 3.06mL, in beaker, opens and stirs, drip NH in 60 DEG C of water-baths
3h
2o solution (6mol/L) also finely tunes to keep to pH=6 frequently, then pours 2.001g Al into
2o
3carrier, leaves standstill 12h after continuing to stir 8h, by carrier 12 0 DEG C oven dry after filtration, and 600 DEG C of roasting 4h, the i.e. (F-TiO of obtained rutile and anatase compound
2)/Al
2o
3carrier, wherein the ratio of rutile-type and anatase is about 2:1.
Measure RuCl
3solution (30.91gRu/L) 2.55mL, drips KOH solution (1mol/L) and regulates solution ph to 3, then by 1.5009g20% (F-TiO
2)/Al
2o
3carrier is poured into, leaves standstill aging 6h, after fully washing, in 110 DEG C of dry 12h, finally obtain 5%RuO at 300 DEG C in 20% oxygen/helium gas mixture roasting 4h after stirring 3h
2/ 20% (F-TiO
2)/Al
2o
3finished product ruthenium oxide catalysts.
Application examples 1
The active testing condition of catalyst: fixed-bed micro-reactor, tube inner diameter 6mm, unstripped gas: 30%N
2o+Ar, air speed 30,000mL/g
cat./ h, normal pressure.P25-TiO
2the 5%RuO supported
2, 5%Ru catalyst active testing result, see Figure 11.
Figure 11 result shows, compared with the 5%Ru catalyst of identical load amount, and P25-TiO
2the 5%RuO supported
2catalyst is at N
2have higher catalytic activity in O decomposition reaction, this illustrates compared to metallic state Ru, RuO
2metal oxide is the active sites that a kind of catalytic efficiency is higher.This result verification also supports the theory of Catalyst Design of the present invention, and active component is the oxide of noble metal Ru, metal oxide containing precious metals and TiO
2between strong interaction, make metal oxide containing precious metals be highly dispersed at TiO
2or through TiO
2the cheap oxide of modification is on carrier.In addition, prepared particle diameter is less, the Precious metal oxidation composition granule of size uniformity is at N
2in O decomposition reaction, namely there is catalyzing N at 160 DEG C
2the activity that O decomposes, initial decomposition temperature is lower, and when 300 DEG C, conversion ratio is up to more than 80%, has good application prospect.
Application examples 2
The active testing condition of catalyst: fixed-bed micro-reactor, tube inner diameter 6mm, unstripped gas: 30%N
2o+Ar, air speed 30,000mL/g
cat./ h, normal pressure.P25-TiO
2the 5%RuO supported
2, 5%Rh
2o
3, 5%IrO
2the active testing result of catalyst, is shown in Figure 12.Figure 12 result shows, at N
2in O decomposition reaction, although P25-TiO
2the 5%Rh supported
2o
3, 5%IrO
2catalyst activity is lower than 5%RuO
2catalyst, but still show good low temperature active, there is catalyzing N when 160-180 DEG C
2the activity that O decomposes.After catalytic reaction temperature is higher than 280 DEG C, 5%Rh
2o
3, 5%IrO
2the activity of catalyst gradually with RuO
2catalyst is suitable, even higher.
Application examples 3
The active testing condition of catalyst: fixed-bed micro-reactor, tube inner diameter 6mm, unstripped gas: 30%N
2o+Ar, air speed 30,000mL/g
cat./ h, normal pressure, probe temperature 300 DEG C.P25-TiO
2the 5%RuO supported
2, 5%Rh
2o
3, 5%IrO
2catalyst is at 30%N
2stability test in O decomposition reaction.
Figure 13 result shows, at N
2in the stability test of O decomposition reaction, P25-TiO
2the 5%RuO supported
2, 5%Rh
2o
3and 5%IrO
2catalyst, in tested at least 5000min, its activity can not reduce, and shows good reaction stability.
In sum, the preparation method of catalyst of the present invention has the advantages such as operation is simple, be convenient to industrial production, repeatability is fabulous, and the particle diameter of obtained nano-noble metal oxide particle is less, size uniformity.Catalyst of the present invention is at N
2have lower initial reaction temperature in O decomposition reaction, the stability of reaction is high, has good application prospect.
Although description has carried out detailed, concrete description to catalyst preparing, obviously this area researcher still can infer other apparent change and content after the description of having read this description.Therefore, the invention is not restricted to specific embodiment in literary composition, allly also should to be included in the application with the not contrary content of spirit and scope of the invention.
Claims (10)
1. a precious metal oxide catalyst, is characterized in that: active component is one or two or more kinds in the oxide of VIII noble metal Ru, Ir, Rh, and carrier is TiO
2or through TiO
2the SiO of modification
2, Al
2o
3, SnO
2one or two or more kinds in cheap oxide;
With elemental metal, wherein metal oxide containing precious metals accounts for the 1-55% of vehicle weight content.
2. according to precious metal oxide catalyst according to claim 1, it is characterized in that: described active component is one or two or more kinds in ruthenium-oxide, yttrium oxide, rhodium oxide.
3. according to precious metal oxide catalyst according to claim 1, it is characterized in that: described carrier, can be rutile TiO
2, Detitanium-ore-type TiO
2, P25 titanium dioxide and rutile-type and Detitanium-ore-type compound TiO
2(be simply referred to as: F-TiO
2); Or, also can be through above-mentioned TiO
2carry out the cheap oxide of surface modification, TiO
2be 1:99-1:1 with the weight ratio of cheap oxide, this cheap oxide comprises: SiO
2, Al
2o
3, SnO
2one or two or more kinds in carrier.
4. the preparation method of precious metal oxide catalyst described in a claim 1, it is characterized in that: the oxide of VIII noble metal loads on carrier by infusion process, through aging, dry, and 200-500 DEG C of roasting, to make active component metal oxide containing precious metals and TiO
2carrier (F-TiO
2) or through TiO
2interaction enhanced between the cheap oxide carrier of surface modification, while significantly improving metal oxide containing precious metals decentralization, obtains final finished catalyst.
5., according to preparation method according to claim 4, it is characterized in that:
The preparation of active component precious metal oxide catalyst: adopt the infusion process improved, first regulate precious metal salt solution pH value and maintain 2-6, carrier is poured in solution, aging 1-10h is left standstill after mixing, after fully washing, 110 DEG C of oven dry, process 2-6h in oxidizing atmosphere at 200-500 DEG C, obtained finished catalyst.
6., according to the preparation method described in claim 4 or 5, it is characterized in that:
The selection of carrier and preparation:
TiO
2: commercial rutile-type, Detitanium-ore-type or P25 titania support can be adopted; Or prepare rutile, anatase by the hydrolysis of Ti salting liquid or there is the rutile of different crystal forms composition and the TiO of anatase compound
2carrier (F-TiO
2); Cheap oxide carrier SiO
2, Al
2o
3, SnO
2adopt commercialization finished product carrier or self-control sample;
Through TiO
2the cheap oxide carrier of modification, its preparation process is as follows: the Ti salting liquid of aequum is placed in 0-80 DEG C of water-bath, when stirring, cheap oxide carrier is poured in Ti salting liquid, and drip aqueous slkali in Ti salting liquid, regulate solution ph and be maintained until 3-10, stir 2-6h, and leave standstill 2-6h, then filter rear 120 DEG C of oven dry, final 300-600 DEG C of calcining 2-12h.
7., according to preparation method according to claim 5, it is characterized in that:
Described Ti salting liquid is TiCl
4, Ti (OC
4h
9)
4or Ti (SO
4)
2the aqueous solution;
Described precious metal salt solution is the solution of a kind of in ruthenium trichloride, nitryl nitric acid ruthenium, nitrosyl radical acetic acid ruthenium, acetylacetone,2,4-pentanedione ruthenium, rhodium chloride, rhodium nitrate, rhodium acetate, praseodynium rhodium, chloro-iridic acid or more than two kinds;
Described adjustment Ti salt and precious metal solution pH value aqueous slkali used comprise NH
3h
2o, Na
2cO
3, NaOH, K
2cO
3, KOH, (NH
4)
2cO
3in the aqueous solution of one or two or more kinds; Described oxidizing atmosphere is the one in air, air/nitrogen mixed gas, air/argon-mixed, air/helium gas mixture, oxygen/nitrogen mixed gas, oxygen/argon-mixed, oxygen/helium gas mixture.
8., according to preparation method according to claim 7, it is characterized in that:
The mass concentration of described Ti salting liquid is at 5-50%;
The mass concentration 1-45% of described precious metal salt solution;
The mass concentration of described aqueous slkali is 2-40%;
In described oxidizing atmosphere, the volume fraction of oxygen is 0.1-21%.
9. precious metal oxide catalyst described in a claim 1 can be used in nitrous oxide reaction, and initial decomposition temperature can be low to moderate 160 DEG C, and when 300 DEG C, conversion ratio is up to 80%, and at least can keep its catalytic activity in 5000min.
10. the application of precious metal oxide catalyst described in claim 1 in nitrous oxide reaction, its concrete reaction condition is: reaction gas consists of 0.5 ~ 60%N
2o, inert gas balances, reaction pressure normal pressure, reaction temperature 150-400 DEG C.
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| CN109569594A (en) * | 2018-11-29 | 2019-04-05 | 全球能源互联网研究院有限公司 | A kind of titanate supports noble metal base analysis oxygen elctro-catalyst and preparation method thereof |
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| CN110075831A (en) * | 2019-05-28 | 2019-08-02 | 中山大学 | A kind of iridium loaded catalyst and preparation method thereof for low-concentration methane catalysis burning |
| CN110075831B (en) * | 2019-05-28 | 2022-07-15 | 中山大学 | Iridium supported catalyst for catalytic combustion of low-concentration methane and preparation method thereof |
| WO2021000672A1 (en) * | 2019-07-03 | 2021-01-07 | 浙江大学 | High-efficiency anti-chlorine poisoning catalyst for catalytic oxidation of volatile organic compound and preparation method therefor |
| CN114561662A (en) * | 2022-03-21 | 2022-05-31 | 天津大学 | PEM (proton exchange membrane) electrolyzed water catalyst, and preparation method and application thereof |
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