CN104888767B - A kind of precious metal oxide catalyst and its preparation and application - Google Patents
A kind of precious metal oxide catalyst and its preparation and application Download PDFInfo
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Abstract
The present invention relates to a kind of preparations and its application of the precious metal oxide catalyst of high activity.The active component of the catalyst is the oxide of noble metal Ru, Ir, Rh, carrier TiO2Or through TiO2Modified SiO2、Al2O3、SnO2Etc. cheap oxide.The present invention passes through modulation TiO2Different crystal forms composition, improve active noble metals oxide and TiO2Between strong interaction, significantly improve the dispersion degree of metal oxide containing precious metals, and then obtain in TiO2Or through TiO2Modified cheap oxide is the precious metal oxide catalyst of high dispersive on carrier.The present invention has many advantages, such as that operation is simple, fabulous convenient for industrial production, repeatability, and the grain size of prepared Precious metal oxidation composition granule is smaller, size uniformity.Catalyst of the present invention is in N2There is lower initial reaction temperature, the stability of reaction is high, has good application prospect in O decomposition reactions.
Description
Technical field
The invention belongs to catalyst preparation technical fields, and in particular to one kind is with TiO2Or through TiO2Modified cheap oxidation
The preparation method of the nano-noble metal oxide catalyst of object load, metal oxide containing precious metals（Ruthenium-oxide, yttrium oxide, rhodium oxide）For
Active component, and it is applied to nitrous oxide reaction.
Background technology
Nitrous oxide (N2O) it is a kind of main greenhouse gases, environment for the survival of mankind is caused prodigious
It destroys, thus seeks to effectively eliminate the N in air2O causes the very big concern of scientist；Moreover, N2O can be used as a kind of new
The green propellant of type causes the great interest of the scientists of space industry with its superior performance.Therefore, in the past
Decades in, scientist has done a large amount of research work, up to now, research and development decompose N2The effective catalyst of O is still in ring
Border is protected and propellant aspect has great importance.
Noble metal（Ru、Rh、Ir）It is acknowledged as the effective catalyst dissociated to N-O keys, thus as the N to place high hopes2O
Decomposition catalyst.However, such noble metal, especially Ru, Ir are easy oxidation in oxidizing atmosphere generates oxide, then send out
Raw agglomeration, and N2Inevitably there is O again in O decomposition reactions2It generates, this strongly limits simple substance noble metal catalysts to exist
N2The catalytic applications that O is decomposed.Have lot of documents report, the crystal structure such as calcium titanium stablized using heat proof material, molecular sieve etc.
Mine, hexa-aluminate, MCM-41 etc., but due to using these methods so that the most of noble metal as active specy is wrapped
The utilization ratio for greatly reducing noble metal in these materials is buried, gained catalyst activity could generally have higher than 400 DEG C
There is preferable catalytic activity.
In addition, in N2In O decomposition reactions, the activated centre of reaction is metallic state noble metal or its oxide, Shang Youzheng
View.Recently some researches show that titanium dioxide（TiO2）The ruthenium catalyst supported aoxidizes Cl processed in HCl2Reaction in have it is preferable
Reactivity, author, which is attributed to ruthenium-oxide, can be dispersed in TiO2Surface, and TiO2Have centainly between ruthenium-oxide
Interaction.Although this seminar reported through H2Ir/TiO made from high temperature reduction2/Al2O3Catalyst
（CN201010522923.5）, active component is metallic state Ir and catalyst does not have any work when temperature is less than 250 DEG C
Property.Up to the present, metal oxide containing precious metals（Ruthenium-oxide, yttrium oxide, rhodium oxide）As active component, load to TiO2Or warp
TiO2It is applied to N on modified cheap oxide complex carrier2O decomposition reactions, there is not been reported.
Invention content
Technical problem solved by the invention be to provide a kind of low temperature is i.e. active, performance is stablized, with TiO2Or warp
TiO2Modified cheap oxide carried nano-noble metal oxide（Ruthenium-oxide, yttrium oxide, rhodium oxide）The preparation of catalyst
Method.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of nano-noble metal oxide catalyst that low temperature, that is, active, reactivity worth is stablized, it is characterised in that：
Active component is the one or two or more kinds in the oxide of noble metal Ru, Ir, Rh, carrier TiO2Or through TiO2Modified is honest and clean
Valence oxide passes through modulation TiO2Different crystal forms composition, improve metal oxide containing precious metals and TiO2Between strong interaction, in turn
The finely dispersed precious metal oxide catalyst in carrier surface is made.
The metal oxide containing precious metals of the catalyst account for the 1-55% of vehicle weight content（With elemental metal）, TiO2With it is honest and clean
The weight ratio of valence oxide is 1:0-1:1.
The specific preparation process of catalyst of the present invention is as follows：
1）The preparation of carrier：
Rutile-type, Detitanium-ore-type or the rutile of commercialization and the titanium dioxide (letter that Detitanium-ore-type is compound may be used
It is written as：F-TiO2)；Or rutile, anatase are prepared by the hydrolysis of Ti salting liquids or formed with different crystal forms compound
TiO2Carrier.
It can also use through TiO2Modified cheap oxide carrier, preparation process are as follows：The Ti salt of calculation amount is molten
Liquid is placed in 0-80 DEG C of water-bath, and in the case of stirring, cheap oxide carrier is poured into Ti salting liquids, and to Ti salting liquids
Middle dropwise addition aqueous slkali adjusts solution ph and maintains to 3-10, stirs 2-6h, and stand 2-6h, 120 DEG C of bakings after then filtering
It is dry, final 300-600 DEG C of calcining 2-12h；
2）The preparation of active component precious metal oxide catalyst：Using improved infusion process, solubilized precious metal is adjusted first
Liquid pH value simultaneously maintains 2-6, and carrier is poured into, and aging 1-10h is stood after mixing, after fully washing, 110 DEG C of drying,
2-6h, finished product catalyst are handled at 200-500 DEG C in oxidizing atmosphere；
Ti salting liquids mentioned above are TiCl4、Ti(OC4H9)4Or Ti (SO4)2Aqueous solution in one kind or two kinds with
On；The precious metal solution be ruthenium trichloride, nitryl nitric acid ruthenium, nitrosyl radical acetic acid ruthenium, acetylacetone,2,4-pentanedione ruthenium, rhodium chloride,
One or two or more kinds in rhodium nitrate, rhodium acetate, praseodynium rhodium, chloro-iridic acid；The adjusting Ti salt and solubilized precious metal
Aqueous slkali used in liquid pH value includes NH3·H2O、Na2CO3、NaOH、K2CO3、KOH、(NH4)2CO3In it is one or two or more kinds of
Aqueous solution；The oxidizing atmosphere is that air, air/nitrogen mixed gas, air/argon-mixed, air/helium gas mixture, oxygen/nitrogen are mixed
Close one kind in gas, oxygen/argon-mixed, oxygen/helium gas mixture.
The precious metal oxide catalyst can be used for nitrous oxide reaction, can decompose at a lower temperature
N2O simultaneously can keep its catalytic activity in a long time.
Application of the precious metal oxide catalyst in nitrous oxide reaction, specific reaction condition are：Instead
Should gas group become 0.5~60%N2O, inert gas balance, reaction pressure normal pressure, 150-400 DEG C of reaction temperature.
Catalyst of the present invention is to be based on active component metal oxide containing precious metals（Ruthenium-oxide, yttrium oxide, rhodium oxide）With titanium dioxide
Titanium（A kind of ingredient in carrier or carrier）Between a kind of existing very strong interaction.In noble metal solution impregnated to carrier
Afterwards, during heat treatment under oxidizing atmosphere, due to being formed by nanoscale precious metal oxide particle and carrier
TiO2Ingredient has very strong interaction, and nano-noble metal oxide particle is difficult to assemble sintering, thus prepares in carrier
Apparent height dispersion, uniform nanoscale precious metal oxide catalyst.Moreover, the strong phase between metal oxide containing precious metals and carrier
Interaction so that the oxygen generated in nitrous oxide reaction, which is easier transferred to from precious metal surface on carrier, to be taken off
It is attached, be conducive to the release of catalyst activity position and react again, to greatly improve the reaction efficiency of nitrous oxide.
Compared with the prior art the present invention, has the following advantages：
1, active component is Precious metal oxidation composition granule in prepared catalyst, and general catalyst is omitted using preceding necessary
Hydrogen reducing activates this process for taking time and effort, having security risk, and preparation method is simple, your prepared gold
It is smaller to belong to oxide particle grain size, is uniformly dispersed in carrier surface；
2, prepared precious metal oxide catalyst has nitrous oxide activity, urges at a lower temperature
Change efficient；
3, prepared nanoscale precious metal oxide particle particle in nitrous oxide reaction does not find aggregation length
Greatly, the activity of reaction keeps stablizing, and has good application prospect.
Description of the drawings
Fig. 1 is 5%RuO prepared by embodiment 12/P25-TiO2Angle of elevation annular dark-scanning transmission of ruthenium oxide catalysts
Charge pattern（HAADF-STEM）Photo；
Fig. 2 is 5%RuO prepared by embodiment 12/P25-TiO2Ruthenium oxide catalysts are by 300oC30%N2O decomposition reactions
Angle of elevation annular dark-scanning transmission charge pattern afterwards（HAADF-STEM）Photo；
Fig. 3 is 15%RuO prepared by embodiment 22/P25-TiO2The high resolution scanning Electronic Speculum of ruthenium oxide catalysts（HRTEM）
Photo；
Fig. 4 is 20%IrO prepared by embodiment 32/P25-TiO2Aoxidize the high resolution scanning Electronic Speculum of iridium catalyst（HRTEM）
Photo；
Fig. 5 is 30%Rh prepared by embodiment 42O3/P25-TiO2The high resolution scanning Electronic Speculum of rhodium oxide catalyst（HRTEM）
Photo；
Fig. 6 is 5%RuO prepared by embodiment 52/20%Rutile-TiO2/Al2O3The TEM photos of ruthenium oxide catalysts；
Fig. 7 is 5%RuO prepared by embodiment 62/20%Rutile-TiO2/SiO2The TEM photos of ruthenium oxide catalysts；
Fig. 8 is 5%RuO prepared by embodiment 72/20%Rutile-TiO2/SnO2The TEM photos of ruthenium oxide catalysts；
Fig. 9 is 5%RuO prepared by embodiment 82/20%F-TiO2/Al2O3The TEM photos of ruthenium oxide catalysts；
Figure 10 is using the compound F-TiO of the rutile and Detitanium-ore-type of method and formula preparation in embodiment 82Carrier
XRD spectrum；
Figure 11 is P25-TiO in application examples 12The 5%RuO supported2, 5%Ru catalyst active testing result figure；
Figure 12 is P25-TiO in application examples 22The 5%RuO supported2、5%Rh2O3、5%IrO2The active testing result of catalyst
Figure；
Figure 13 is P25-TiO in application examples 32The 5%RuO supported2、5%Rh2O3、5%IrO2Catalyst is in 30%N2O decomposes anti-
Stability test chart in answering；
Specific implementation mode
Embodiment 1
5%RuO2/P25-TiO2The preparation of ruthenium oxide catalysts：
At room temperature, RuCl is measured3Solution（30.91gRu/L）NaOH solution is added dropwise in 2.55mL（1mol/L）Adjust pH value of solution
Value is to 3, then by 1.5009g P25-TiO2Carrier pours into, and continues to stir 4h, stands aging 6h, after fully washing, in
110 DEG C of dry 10h finally roast 4h at 300 DEG C in air and 5%RuO are made2/P25-TiO2Ruthenium-oxide finished catalyst；
Embodiment 2
20%RuO2/P25-TiO2The preparation of ruthenium oxide catalysts：
Measure RuCl3Solution（30.91gRu/L）12.1mL is placed in 60 DEG C of water-baths, and NaOH solution is added dropwise（3mol/L）It adjusts
Solution ph is saved to 4, then by 1.501gP25-TiO2Carrier pours into mixing, continues after stirring 6h, aging 6h is stood, through abundant
After washing, in 110 DEG C of dry 8h, 4h is finally roasted in 10% oxygen/nitrogen mixed gas at 300 DEG C to which 20%RuO be made2/P25-
TiO2Ruthenium-oxide finished catalyst；
Embodiment 3
15%IrO2/P25-TiO2Aoxidize the preparation of iridium catalyst：
Measure H2IrCl6Solution（Ir weight fractions 19.8wt.%）NaOH solution is added dropwise in 0.8913g（3mol/L）It adjusts molten
Liquid pH value is to 5, then by 1.001g P25-TiO2Carrier pours into, and continues after stirring 8h, stands aging 6h, after fully washing,
In 110 DEG C of dry 12h, finally 500 DEG C in 10% oxygen/argon-mixed middle roasting 4h to be made 15%IrO2/P25-TiO2Oxidation
Iridium finished catalyst；
Embodiment 4
30%Rh2O3/P25-TiO2The preparation of rhodium oxide catalyst：
Weigh RhCl3Solution（Rh weight fractions 19.26wt.%）2.2252g NaOH solution is added dropwise（3mol/L）It adjusts molten
Liquid pH value is to 7, then by 1.003g P25-TiO2Carrier pours into, and aging 6h is stood after stirring 8h, after fully washing, in 110
DEG C dry 16h, finally roasts 6h to which 30%Rh be made at 600 DEG C in 10% oxygen/helium gas mixture2O3/P25-TiO2Rhodium oxide at
Product catalyst；
Embodiment 5
5%RuO2/20%Rutile-TiO2/Al2O3The preparation of ruthenium oxide catalysts：
Measure TiCl4Solution（0.91mol/L, the 2mol/L of concentration containing HCl）In 3.06mL to beaker, opened in 50 DEG C of water-baths
Stirring is opened, NH is added dropwise3·H2O solution (3mol/L) is subsequently poured into 2.001g Al to pH=42O3Carrier continues to stand after stirring 8h
0 DEG C of drying of carrier 12,600 DEG C of roasting 4h are obtained rutile TiO by 12h after filtering2Modified 20%Rutile-TiO2/
Al2O3Complex carrier;
Measure RuCl3Solution（30.91gRu/L）NaOH solution is added dropwise in 2.55mL（1mol/L）Solution ph is adjusted to 3,
Then by 1.5009g20%Rutile-TiO2/Al2O3Carrier pours into, and aging 6h is stood after stirring 4h, after fully washing, in
110 DEG C of dry 12h finally roast 4h at 300 DEG C in 5% oxygen/nitrogen mixed gas and 5%RuO are made2/20%Rutile-TiO2/Al2O3
Finished product ruthenium oxide catalysts.
Embodiment 6
5%RuO2/20%Rutile-TiO2/SiO2The preparation of ruthenium oxide catalysts：
Measure TiCl4Solution（0.91mol/L, the 2mol/L of concentration containing HCl）In 3.06mL to beaker, opened in 50 DEG C of water-baths
Stirring is opened, (NH is added dropwise4)2·CO3Solution (2mol/L) is subsequently poured into 2.001g Al to pH=52O3Carrier continues to stir quiet after 8h
12h is set, 0 DEG C of drying of carrier 12,600 DEG C of roasting 4h are obtained into rutile TiO after filtering2Modified 20%Rutile-
TiO2/SiO2Complex carrier;
Measure RuCl3Solution（30.91gRu/L）KOH solution is added dropwise in 3.41mL（1mol/L）Adjust solution ph to 5, so
Afterwards by 2.001g20%Rutile-TiO2/SiO2Carrier pours into, and aging 6h is stood after stirring 4h, after fully washing, in 110 DEG C
Dry 8h finally roasts 4h at 400 DEG C in 2% oxygen/nitrogen mixed gas and 5%RuO is made2/20%Rutile-TiO2/SiO2Finished product oxygen
Change ruthenium catalyst.
Embodiment 7
5%RuO2/20%Rutile-TiO2/SnO2The preparation of ruthenium oxide catalysts：
Measure TiCl4Solution（0.91mol/L, the 2mol/L of concentration containing HCl）In 3.06mL to beaker, opened in 50 DEG C of water-baths
Stirring is opened, Na is added dropwise2CO3Solution (2mol/L) is subsequently poured into 2.001g SnO to pH=32Carrier continues to stand 12h after stirring 8h,
0 DEG C of drying of carrier 12,600 DEG C of roasting 4h are obtained into rutile TiO after filtering2Modified 20%Rutile-TiO2/SnO2
Complex carrier;
Measure RuCl3Solution（30.91gRu/L）KOH solution is added dropwise in 2.55mL（1mol/L）Adjust solution ph to 5, so
Afterwards by 1.5008g20%Rutile-TiO2/SnO2Carrier pours into, and aging 6h is stood after stirring 4h, after fully washing, in 110 DEG C
Dry 8h finally roasts 6h at 500 DEG C in 0.5% oxygen/nitrogen mixed gas and 5%RuO is made2/20%Rutile-TiO2/SnO2Finished product
Ruthenium oxide catalysts.
Embodiment 8
5%RuO2/20%(F-TiO2)/Al2O3The preparation of ruthenium oxide catalysts：
Measure TiCl4Solution（0.91mol/L, the 2mol/L of concentration containing HCl）In 3.06mL to beaker, opened in 60 DEG C of water-baths
Stirring is opened, NH is added dropwise3·H2O solution (6mol/L) is to pH=6 and is finely tuned frequently to keep, and is subsequently poured into 2.001g Al2O3It carries
Body continues to stand 12h after stirring 8h, and by 0 DEG C of drying of carrier 12 after filtering, 600 DEG C of roasting 4h, obtain rutile and anatase is multiple
(the F-TiO closed2)/Al2O3The ratio of carrier, wherein rutile-type and anatase is about 2:1.
Measure RuCl3Solution（30.91gRu/L）KOH solution is added dropwise in 2.55mL（1mol/L）Adjust solution ph to 3, so
Afterwards by 1.5009g20% (F-TiO2)/Al2O3Carrier pours into, and aging 6h is stood after stirring 3h, dry in 110 DEG C after fully washing
Finally 5%RuO is made in 20% oxygen/helium gas mixture roasting 4h at 300 DEG C in dry 12h2/20%(F-TiO2)/Al2O3Finished product ruthenium-oxide
Catalyst.
Application examples 1
The active testing condition of catalyst：Fixed-bed micro-reactor, tube inner diameter 6mm, unstripped gas：30%N2O+Ar, it is empty
Fast 30,000mL/gcat./ h, normal pressure.P25-TiO2The 5%RuO supported2, 5%Ru catalyst active testing as a result, seeing Figure 11.
Figure 11 the result shows that, compared with the 5%Ru catalyst of identical load amount, P25-TiO2The 5%RuO supported2Catalyst exists
N2There is higher catalytic activity, this explanation is compared to metallic state Ru, RuO in O decomposition reactions2Metal oxide is a kind of catalysis
More efficient active sites.The result verification and the theory for supporting Catalyst Design of the present invention, active component are noble metal Ru
Oxide, metal oxide containing precious metals and TiO2Between strong interaction so that metal oxide containing precious metals are highly dispersed at TiO2Or warp
TiO2Modified cheap oxide is on carrier.In addition, prepared grain size is smaller, the Precious metal oxidation composition granule of size uniformity
In N2In O decomposition reactions, there is catalysis N at 160 DEG C2The activity that O is decomposed, initial decomposition temperature is relatively low, conversion ratio at 300 DEG C
It has been up to 80% or more, there is good application prospect.
Application examples 2
The active testing condition of catalyst：Fixed-bed micro-reactor, tube inner diameter 6mm, unstripped gas：30%N2O+Ar, it is empty
Fast 30,000mL/gcat./ h, normal pressure.P25-TiO2The 5%RuO supported2、5%Rh2O3、5%IrO2The active testing knot of catalyst
Fruit sees Figure 12.Figure 12 the result shows that, in N2In O decomposition reactions, although P25-TiO2The 5%Rh supported2O3、5%IrO2Catalyst is lived
Property be less than 5%RuO2Catalyst, but still preferable low temperature active is shown, there is catalysis N at 160-180 DEG C2O is decomposed
Activity.After catalytic reaction temperature is higher than 280 DEG C, 5%Rh2O3、5%IrO2The activity of catalyst is gradually and RuO2Catalyst phase
When even higher.
Application examples 3
The active testing condition of catalyst：Fixed-bed micro-reactor, tube inner diameter 6mm, unstripped gas：30%N2O+Ar, it is empty
Fast 30,000mL/gcat./ h, normal pressure, 300 DEG C of test temperature.P25-TiO2The 5%RuO supported2、5%Rh2O3、5%IrO2Catalyst
In 30%N2Stability test in O decomposition reactions.
Figure 13 the result shows that, in N2In the stability test of O decomposition reactions, P25-TiO2The 5%RuO supported2、5%Rh2O3
And 5%IrO2Catalyst, its activity will not reduce in at least 5000min tested, it is shown that good stable reaction
Property.
In conclusion the preparation method of catalyst of the present invention has, operation is simple, convenient for industrial production, repeated pole
The advantages that good, the grain size of obtained nano-noble metal oxide particle is smaller, size uniformity.Catalyst of the present invention is in N2O points
There is lower initial reaction temperature, the stability of reaction is high, has good application prospect in solution reaction.
Although specification has carried out detailed, specific description to catalyst preparation, it is apparent that this field researcher exists
Other obvious variations and content are still would conclude that after having read the description of this specification.Therefore, the present invention is not limited to texts
Middle specific embodiment, it is all to should also be included in the application with the content that spirit and scope of the invention is not disagreed.
Claims (8)
1. a kind of precious metal oxide catalyst is directly used in the application in nitrous oxide reaction, it is characterised in that：It uses
It is preceding without hydrogen reducing activate, active component be VIII group noble metal Ru, Ir, Rh oxide in one kind or two kinds with
On, carrier is rutile-type and the compound TiO of Detitanium-ore-type2, wherein rutile-type and the compound TiO of Detitanium-ore-type2Referred to as it
For：F-TiO2；Alternatively, for through F-TiO2Carry out the cheap oxide of surface modification, TiO2Weight ratio with cheap oxide is 1:
99-1:1, which includes：SiO2、Al2O3、SnO2One or two or more kinds in carrier,
Preparation method is specially：The oxide of VIII group noble metal is to use improved infusion process, adjusts precious metal salt first
Adhesive force of the precious metal salt solution on carrier and 2-6 is maintained when solution ph is to improve dipping, then poured into carrier molten
In liquid, aging 1-10 h, after fully washing, 110 are stood after mixingoC is dried, in 200-500oIt is roasted in oxidizing atmosphere under C
Processing, further makes active component metal oxide containing precious metals and F-TiO2Carrier or F-TiO2Between the cheap oxide that surface is modified
Interaction enhanced significantly improves metal oxide containing precious metals dispersion degree, obtains final finished catalyst；
With elemental metal, wherein metal oxide containing precious metals account for the 1-55% of vehicle weight content.
2. application described in accordance with the claim 1, it is characterised in that：The active component is ruthenium-oxide, yttrium oxide, rhodium oxide
In one or two or more kinds.
3. application described in accordance with the claim 1, it is characterised in that：Carrier is P25 titanium dioxide.
4. application described in accordance with the claim 1, it is characterised in that：
The selection and preparation of carrier：
TiO2：Using P25 titania supports；Or it is compound to prepare rutile and anatase by the hydrolysis of Ti salting liquids
TiO2Carrier (F-TiO2)；Cheap oxide carrier SiO2、Al2O3、SnO2Using commercialization finished product carrier or self-control sample；
Through TiO2Modified cheap oxide carrier, preparation process are as follows：The desired amount of Ti salting liquids are placed in 0-80oC water
In bath, in the case of stirring, cheap oxide carrier is poured into Ti salting liquids, and aqueous slkali is added dropwise into Ti salting liquids,
It adjusts solution ph and maintains to 3-10,2-6 h are stirred, and stand 2-6 h, 120 after then filteringoC is dried, final 300-
600 DEG C of calcining 2-12 h.
5. applying according to claim 4, it is characterised in that：
The Ti salting liquids are TiCl4、Ti(OC4H9)4Or Ti (SO4)2Aqueous solution；
The precious metal salt solution is ruthenium trichloride, nitryl nitric acid ruthenium, nitrosyl radical acetic acid ruthenium, acetylacetone,2,4-pentanedione ruthenium, tri-chlorination
A kind of in rhodium, rhodium nitrate, rhodium acetate, praseodynium rhodium, chloro-iridic acid or two kinds or more of solution；
It includes NH to adjust aqueous slkali used in Ti salt and precious metal solution pH value3·H2O、Na2CO3、NaOH、K2CO3、KOH、(NH4)2CO3In one or two or more kinds of aqueous solutions；The oxidizing atmosphere is air, air/nitrogen mixed gas, air/argon mixing
One kind in gas, air/helium gas mixture, oxygen/nitrogen mixed gas, oxygen/argon-mixed, oxygen/helium gas mixture.
6. applying according to claim 5, it is characterised in that：
The mass concentration of the Ti salting liquids is in 5-50%；
The mass concentration 1-45% of the precious metal salt solution；
The mass concentration of the aqueous slkali is 2-40%；
The volume fraction of oxygen is 0.1-21% in the oxidizing atmosphere.
7. application described in accordance with the claim 1, initial decomposition temperature is down to 160oC, at 300 DEG C high conversion rate up to 80%, and
Its catalytic activity can be at least kept in 5000 min.
8. application described in accordance with the claim 1, specific reaction condition are：Reaction gas group becomes 0.5 ~ 60% N2O, indifferent gas
Body balances, reaction pressure normal pressure, reaction temperature 150-400oC。
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| 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 |
| CN110404534B (en) * | 2019-07-03 | 2021-03-30 | 浙江大学 | High-efficiency chlorine poisoning resistant volatile organic compound catalytic oxidation catalyst and preparation method thereof |
| 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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