CN1212889C - Catalytic combustion catalyst and preparing method thereof - Google Patents

Catalytic combustion catalyst and preparing method thereof Download PDF

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Publication number
CN1212889C
CN1212889C CN 02133123 CN02133123A CN1212889C CN 1212889 C CN1212889 C CN 1212889C CN 02133123 CN02133123 CN 02133123 CN 02133123 A CN02133123 A CN 02133123A CN 1212889 C CN1212889 C CN 1212889C
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coating
catalyst
catalytic combustion
air
aqueous solution
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CN1488435A (en
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李东旭
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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Abstract

The present invention relates to a catalytic combustion catalyst used for purifying organic waste gas, which is composed of a nubbly carrier framework made from honeycomb ceramic, a coating layer coated on the carrier framework, and active components of noble metal. The catalyst has the characteristics of no falling of the coating layer, good performance of high temperature resistance, and high effective utilization rate of the active constituents of the noble metal. The coating layer of the catalyst is composed of a composite oxide formed from Al2O3, SiO2 and one or a plurality of alkaline earth metal oxides, wherein the coating layer is firmly combined with the carrier framework made from the honeycomb ceramic and is difficult to fall during use. The coating layer has the components of the alkaline earth metal oxides and silicon dioxide, and the coating layer and the catalyst have good performance of high temperature resistance. Thereby, the active components of the noble metal are loaded by an immersion method and have the advantage of high utilization ratio, and the catalytic combustion catalyst is used for purifying organic waste gas.

Description

A kind of catalyst for catalytic combustion and preparation method thereof
1, technical field
The present invention relates to a kind of catalyst for catalytic combustion and preparation method thereof, more particularly, relate to a kind of catalyst for catalytic combustion that is used for the organic waste-gas purification processing and preparation method thereof.
2, background technology
Catalytic combustion is meant under the effect of catalyst as a kind of improvement method of organic exhaust gas, at the deep oxidation of catalyst surface generation organic molecule, makes organic exhaust gas be converted into harmless carbon dioxide and water.Therefore catalytic combustion is called complete oxidation or catalysis deep oxidation again.Catalytic combustion more and more comes into one's own as a kind of easy, practical organic waste-gas purification technology.Chinese patent 88100589 discloses a kind of " catalyst of purifying exhaust air and production method thereof ", this catalyst is made up of the honeycomb support of en-block construction and the coating that applies on it, this coating by zirconia, refractory inorganic oxide and the rare-earth oxide of load platinum group metal form catalyst composition.The method for making of this catalyst is with the moisture thin pulp coating honeycomb substrate of catalyst composition and calcines the carrier that has applied.The shortcoming of this Catalysts and its preparation method is: owing to directly use mixed oxide to prepare the moisture thin pulp of applying coating, coating is firm inadequately with combining of honeycomb ceramic carrier, the coating shedding phenomenon in use easily takes place, thereby reduces the serviceability of catalyst; And the platinum family noble metal component has quite a few to be covered by metal oxide, and the result greatly reduces the effective rate of utilization of noble metal.
3, summary of the invention
Purpose of the present invention just provides a kind of coating and combines firmly with the honeycomb ceramic carrier skeleton, the catalyst for catalytic combustion that the resistance to elevated temperatures that coating difficult drop-off in use, and noble metal effective rate of utilization is high is good, and provide this Preparation of catalysts method.
Catalyst for catalytic combustion of the present invention adopts the honeycomb support skeleton, and there is a coating on honeycomb support skeleton surface, and the percetage by weight of each ingredients constitute coating gross weight is in the coating: Al 2O 350%～85%, SiO 210%～40%, alkaline earth oxide 1%～10%.Alkaline earth oxide is meant any one or two kinds of above mixtures of MgO, CaO, BaO, is preferably MgO.Catalyst is an active component with Pt and/or the pd that loads on the coating, and the percentage by weight that active component accounts for total catalyst weight is 0.1%～0.5%.The preferred honeycomb ceramic carrier of honeycomb support skeleton.The specific area of coating is 200～300m 2/ g.
The preparation method of catalyst for catalytic combustion of the present invention comprises:
(1) slurry preparation of applying coating, detailed process is: add the gluey suspension that ammoniacal liquor is prepared aluminium hydroxide in aluminum nitrate aqueous solution, o'clock stop to add ammoniacal liquor in pH=6.5～7.0, add an amount of aluminum nitrate solution then, make and contain excessive aluminum nitrate in the suspension, the concentration of aluminum nitrate is 1～10gAl in the suspension 2O 3/ 1000mL.In this suspension, add the aqueous solution of Ludox and alkaline earth nitrate then according to each components contents in the coating in proportion, stir, mix the coating liquid of moisture thin pulp as honeycomb ceramic carrier coating with this.Add excessive aluminum nitrate and add alkaline earth nitrate and can bring into play the binding agent effect of nitrate when thermal decomposition, make the coating firm attachment on the honeycomb ceramic carrier surface.Alkaline earth nitrate is selected Mg (NO for use 3) 2, Ca (NO 3) 2, Ba (NO 3) 2Any one or two kinds of above mixtures, be preferably Mg (NO 3) 2The aqueous slurry of this applying coating is made up of alumine hydroxide colloid, Ludox, aluminum nitrate, alkaline earth nitrate and water, and slurries must be rarer, in case honeycomb ceramic carrier immerse slurries after the aperture by the slurries shutoff.The concentration of the slurries of applying coating is to contain 50～200g solid mixed oxide in every 1000mL slurries.Solid mixed oxide is meant the Al that coating forms after roasting 2O 3, SiO 2And alkaline earth oxide.
(2) honeycomb substrate skeleton applying coating, process be for to take out the honeycomb ceramic carrier skeleton in above-mentioned thin pulp behind the submergence certain hour, again through air drying and calcination process, promptly make and have firm coating and the good honeycomb ceramic carrier of resistance to elevated temperatures.
(3) the active metal component dipping supports noble metal active component Pt and/or Pd by infusion process, and drying, roasting then finally makes catalyst for catalytic combustion of the present invention.
The coating of catalyst of the present invention is a porous bigger serface material, and it not only provides and has reacted necessary enough surface areas, and makes the noble metal active component can be dispersed in the outer surface of carrier and bring into play effective function.The alkaline earth oxide that comprises in the coating can improve the resistance to elevated temperatures of coating and catalyst, makes catalyst can resist and adapt to recurrent temperature fluctuation and high temperature impact in the use, improves its service life.Add SiO in the coating 2On the one hand be for Al 2O 3The porous coating that is engaged in honeycomb ceramic carrier surface formation bigger serface also has the effect that improves coating and catalyst tolerates high-temperature behavior on the other hand so that support the noble metal active component.
The advantage of catalyst for catalytic combustion of the present invention is: coating combines firmly with the honeycomb ceramic carrier surface, thereby is difficult for taking place the coating shedding phenomenon in the use of catalyst; Simultaneously, owing to added SiO in the coating 2And alkaline earth oxide, catalyst for catalytic combustion has the good temperature resistance energy, makes catalyst can resist the catalyst high temperature deactivation that the reaction of surface generation vigorous oxidation causes in the use; Adopt infusion process to support the noble metal active component, the effective rate of utilization height of noble metal.
The characteristics of the inventive method are to prepare a kind of slurries of strong adhesion, this slurries have very strong adhesive force at honeycomb ceramic carrier Skeleton Table mask, and after high-temperature roasting, its adhesive force can further be strengthened, and helps forming the coating with the honeycomb ceramic carrier strong bonded greatly.
4, the specific embodiment
Coating of the present invention in conjunction with firmly, preparation method with catalyst for catalytic combustion that resistance to elevated temperatures and noble metal active component be effectively used comprises following concrete steps:
(1) in aluminum nitrate aqueous solution, adds the gluey suspension that ammoniacal liquor is prepared aluminium hydroxide, o'clock stop to add ammoniacal liquor in pH=6.5～7.0, add an amount of aluminum nitrate solution, make and contain excessive aluminum nitrate in the suspension, the concentration of aluminum nitrate is 1～10gAl in the suspension 2O 3/ 1000mL.In this suspension, add the aqueous solution of Ludox and alkaline earth nitrate then according to each components contents in the coating in proportion, stir, mix the coating liquid of moisture thin pulp as honeycomb ceramic carrier coating with this.Alkaline earth nitrate is selected Mg (NO for use 3) 2, Ca (NO 3) 2, Ba (NO 3) 2Any one or two kinds of above mixtures, be preferably Mg (NO 3) 2The aqueous slurry of this applying coating is made up of alumine hydroxide colloid, Ludox, aluminum nitrate, alkaline earth nitrate and water, and slurries must be rarer, in case honeycomb ceramic carrier immerse slurries after the aperture by the slurries shutoff.The concentration of the slurries of applying coating is to contain 50～200g solid mixed oxide in every 1000mL slurries, and solid mixed oxide is meant the Al that coating forms after roasting 2O 3, SiO 2And alkaline earth oxide;
(2) block honeycomb ceramic carrier is immersed in above-mentioned moisture thin pulp, take out after 5～30 minutes, remove residual slurries in the hole, then 60～120 ℃ of dryings 5～15 hours in air, 400～650 ℃ of roastings are 1～5 hour in the air, obtain being coated with the honeycomb ceramic carrier of mixed oxide coatings;
(3) use H 2PtCl 6The aqueous solution or PdCl 2The mixed liquor that the aqueous solution or the two are made into by a certain percentage is as the maceration extract that supports the noble metal active component, starch the above-mentioned honeycomb ceramic carrier that has applied coating and in the noble metal maceration extract, flood taking-up after 10～40 minutes, remove the residual liquid in the honeycomb ceramic carrier hole, 100～120 ℃ of dryings 5～20 hours in air then, 500～650 ℃ of roastings are 1～5 hour in the air, promptly make catalyst for catalytic combustion of the present invention.Regulate concentration, dip time or the dipping number of times of noble metal maceration extract, the percentage by weight that makes noble metal active ingredients constitute total catalyst weight is 0.1%～0.5%
More specifically catalyst for catalytic combustion of the present invention and preparation method thereof is described in detail below in conjunction with embodiment.The present invention is not limited to the following examples.
Embodiment 1
Measuring 100mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution, under agitation the weak aqua ammonia that slowly adds 20% (V/V) is to pH=7.0, and adding 2mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution continued to stir after 10 minutes, and adding 133mL concentration is 30g SiO 2The Ludox of/100mL solution, adding 100mL concentration again is the Mg (NO of 10g MgO/100mL solution 3) 2The aqueous solution, adding water purification to moisture thin pulp cumulative volume is 1000mL, is stirred to evenly, with the coating liquid of this moisture thin pulp as honeycomb ceramic carrier coating.
To be of a size of 72 * 72 * 50mm, percent opening is 300cell/in 2The honeycomb ceramic carrier skeleton be immersed in the above-mentioned moisture thin pulp, submergence was taken out after 10 minutes, removed residual slurries in the hole with compressed air, then 60 ℃ of dryings 15 hours in air, 550 ℃ of roastings are 2 hours in the air, promptly make the honeycomb ceramic carrier with firm high-temperaure coating.
Compound concentration is the H of 0.4gPt/100mL solution 2PtCl 6Aqueous solution 1000mL is as noble metal active component maceration extract, to apply cated honeycomb ceramic carrier and in this maceration extract, flood taking-up after 20 minutes, blow away residual solution in the hole with compressed air, 120 ℃ of dryings 10 hours in air then, 500 ℃ of roastings are 5 hours in the air, promptly make catalyst for catalytic combustion.
Embodiment 2
Measuring 110mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution, under agitation the weak aqua ammonia that slowly adds 20% (V/V) is to pH=6.5, and adding 4mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution continued to stir after 10 minutes, and adding 117mL concentration is 30g SiO 2The Ludox of/100mL solution, adding 50mL concentration again is the Mg (NO of 10g MgO/100mL solution 3) 2The aqueous solution and 50mL concentration are the Ba (NO of 10g BaO/100mL solution 3) 2The aqueous solution, adding water purification to moisture thin pulp cumulative volume is 1000mL, is stirred to evenly, with the coating liquid of this moisture thin pulp as honeycomb ceramic carrier coating.
To be of a size of 72 * 72 * 50mm, percent opening is 300cell/in 2The honeycomb ceramic carrier skeleton be immersed in the above-mentioned moisture thin pulp, submergence was taken out after 20 minutes, removed residual slurries in the hole with compressed air, then 100 ℃ of dryings 8 hours in air, 400 ℃ of roastings are 5 hours in the air, promptly make the honeycomb ceramic carrier with firm high-temperaure coating.
Compound concentration is the H of 0.4gPt/100mL solution 2PtCl 6Aqueous solution 1000mL is as noble metal active component maceration extract, to apply cated honeycomb ceramic carrier and in this maceration extract, flood taking-up after 40 minutes, blow away residual solution in the hole with compressed air, 100 ℃ of dryings 20 hours in air then, 650 ℃ of roastings are 1 hour in the air, promptly make catalyst for catalytic combustion.
Embodiment 3
Measuring 120mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution, under agitation the weak aqua ammonia that slowly adds 20% (V/V) is to pH=6.5, and adding 6mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution continued to stir after 10 minutes, and adding 116mL concentration is 30g SiO 2The Ludox of/100mL solution, adding 50mL concentration again is the Ca (NO of 10g CaO/100mL solution 3) 2The aqueous solution, adding water purification to moisture thin pulp cumulative volume is 1000mL, is stirred to evenly, with the coating liquid of this moisture thin pulp as honeycomb ceramic carrier coating.
To be of a size of 72 * 72 * 50mm, percent opening is 300cell/in 2The honeycomb ceramic carrier skeleton be immersed in the above-mentioned moisture thin pulp, submergence was taken out after 30 minutes, removed residual slurries in the hole with compressed air, then 80 ℃ of dryings 13 hours in air, 500 ℃ of roastings are 4 hours in the air, promptly make the honeycomb ceramic carrier with firm high-temperaure coating.
Compound concentration is the H of 0.4gPt/100mL solution 2PtCl 6Aqueous solution 1000mL is as noble metal active component maceration extract, to apply cated honeycomb ceramic carrier and in this maceration extract, flood taking-up after 10 minutes, blow away residual solution in the hole with compressed air, 100 ℃ of dryings 5 hours in air then, 600 ℃ of roastings are 2 hours in the air, promptly make catalyst for catalytic combustion.
Embodiment 4
Measuring 140mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution, under agitation the weak aqua ammonia that slowly adds 20% (V/V) is to pH=6.5, and adding 8mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution continued to stir after 10 minutes, and adding 83mL concentration is 30g SiO 2The Ludox of/100mL solution, adding 50mL concentration again is the Mg (NO of 10g MgO/100mL solution 3) 2The aqueous solution, adding water purification to moisture thin pulp cumulative volume is 1000mL, is stirred to evenly, with the coating liquid of this moisture thin pulp as honeycomb ceramic carrier coating.
To be of a size of 72 * 72 * 50mm, percent opening is 300cell/in 2The honeycomb ceramic carrier skeleton be immersed in the above-mentioned moisture thin pulp, submergence was taken out after 15 minutes, removed residual slurries in the hole with compressed air, then 100 ℃ of dryings 10 hours in air, 600 ℃ of roastings are 3 hours in the air, promptly make the honeycomb ceramic carrier with firm high-temperaure coating.
Compound concentration is the H of 0.4gPt/100mL solution 2PtCl 6Aqueous solution 1000mL is as noble metal active component maceration extract, to apply cated honeycomb ceramic carrier and in this maceration extract, flood taking-up after 30 minutes, blow away residual solution in the hole with compressed air, 120 ℃ of dryings 10 hours in air then, 550 ℃ of roastings are 4 hours in the air, promptly make catalyst for catalytic combustion.
Embodiment 5
Measuring 150mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution, under agitation the weak aqua ammonia that slowly adds 20% (V/V) is to pH=6.5, and adding 10mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution continued to stir after 10 minutes, and adding 80mL concentration is 30g SiO 2The Ludox of/100mL solution, adding 30mL concentration again is the Mg (NO of 10g MgO/100mL solution 3) 2The aqueous solution, adding water purification to moisture thin pulp cumulative volume is 1000mL, is stirred to evenly, with the coating liquid of this moisture thin pulp as honeycomb ceramic carrier coating.
To be of a size of 72 * 72 * 50mm, percent opening is 300cell/in 2The honeycomb ceramic carrier skeleton be immersed in the above-mentioned moisture thin pulp, submergence was taken out after 10 minutes, removed residual slurries in the hole with compressed air, then 120 ℃ of dryings 12 hours in air, 550 ℃ of roastings are 3 hours in the air, promptly make the honeycomb ceramic carrier with firm high-temperaure coating.
Compound concentration is the H of 0.4gPt/100mL solution 2PtCl 6Aqueous solution 1000mL is as noble metal active component maceration extract, to apply cated honeycomb ceramic carrier and in this maceration extract, flood taking-up after 20 minutes, blow away residual solution in the hole with compressed air, 120 ℃ of dryings 15 hours in air then, 550 ℃ of roastings are 3 hours in the air, promptly make catalyst for catalytic combustion.
Embodiment 6
Measuring 160mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution, under agitation the weak aqua ammonia that slowly adds 20% (V/V) is to pH=6.5, and adding 10mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution continued to stir after 10 minutes, and adding 53mL concentration is 30g SiO 2The Ludox of/100mL solution, adding 40mL concentration again is the Mg (NO of 10g MgO/100mL solution 3) 2The aqueous solution, adding water purification to moisture thin pulp cumulative volume is 1000mL, is stirred to evenly, with the coating liquid of this moisture thin pulp as honeycomb ceramic carrier coating.
To be of a size of 72 * 72 * 50mm, percent opening is 300cell/in 2The honeycomb ceramic carrier skeleton be immersed in the above-mentioned moisture thin pulp, submergence was taken out after 25 minutes, removed residual slurries in the hole with compressed air, then 120 ℃ of dryings 5 hours in air, 580 ℃ of roastings are 3 hours in the air, promptly make the honeycomb ceramic carrier with firm high-temperaure coating.
Compound concentration is the H of 0.4gPt/100mL solution 2PtCl 6Aqueous solution 1000mL is as noble metal active component maceration extract, to apply cated honeycomb ceramic carrier and in this maceration extract, flood taking-up after 15 minutes, blow away residual solution in the hole with compressed air, 120 ℃ of dryings 12 hours in air then, 550 ℃ of roastings are 3 hours in the air, promptly make catalyst for catalytic combustion.
Embodiment 7
Measuring 170mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution, under agitation the weak aqua ammonia that slowly adds 20% (V/V) is to pH=6.5, and adding 10mL concentration is 50g Al 2O 3Al (the NO of/100mL solution 3) 3The aqueous solution continued to stir after 10 minutes, and adding 43mL concentration is 30g SiO 2The Ludox of/100mL solution, adding 20mL concentration again is the Mg (NO of 10g MgO/100mL solution 3) 2The aqueous solution, adding water purification to moisture thin pulp cumulative volume is 1000mL, is stirred to evenly, with the coating liquid of this moisture thin pulp as honeycomb ceramic carrier coating.
To be of a size of 72 * 72 * 50mm, percent opening is 300cell/in 2The honeycomb ceramic carrier skeleton be immersed in the above-mentioned moisture thin pulp, submergence was taken out after 5 minutes, removed residual slurries in the hole with compressed air, then 100 ℃ of dryings 12 hours in air, 650 ℃ of roastings are 1 hour in the air, promptly make the honeycomb ceramic carrier with firm high-temperaure coating.
Compound concentration is the H of 0.4gPt/100mL solution 2PtCl 6Aqueous solution 1000mL is as noble metal active component maceration extract, to apply cated honeycomb ceramic carrier and in this maceration extract, flood taking-up after 25 minutes, blow away residual solution in the hole with compressed air, 100 ℃ of dryings 8 hours in air then, 600 ℃ of roastings are 3 hours in the air, promptly make catalyst for catalytic combustion.
Embodiment 8
With concentration is the PdCl of 0.4gPd/100mL solution 2Aqueous solution 1000mL is as noble metal active component maceration extract, and all the other are with embodiment 5.
Embodiment 9
With concentration is the H of 0.4gPt/100mL solution 2PtCl 6The aqueous solution and concentration are the PdCl of 0.4gPd/100mL solution 2The equal-volume mixed liquor 1000mL of the aqueous solution is as the maceration extract of noble metal active component, and all the other are with embodiment 5.
Comparative Examples 1
Accurately take by weighing 75g and flooded the Al that supports 0.3% (weight) Pt 2O 3Powder and 3g MgO powder, mixing back adding 80mL concentration is 30g SiO 2The Ludox of/100mL solution adds the water purification agitation grinding then, is made into the moisture thin pulp of 1000mL.To be of a size of 72 * 72 * 50mm, percent opening is 300cell/in 2The honeycomb ceramic carrier skeleton be immersed in the above-mentioned moisture thin pulp, submergence was taken out after 10 minutes, removed residual slurries in the hole with compressed air, 120 ℃ of dryings 12 hours in air then, 550 ℃ of roastings are 3 hours in the air, promptly make the comparative catalyst.
The catalyst for catalytic combustion of the present invention's preparation is filled in the fixed-bed catalytic combustion reactor, be used for organic waste-gas purification and handle, the results are shown in Table 1.
The result of use of table 1 catalyst for catalytic combustion
Embodiment 1 2 3 4 5 6 7 8 9 Comparative Examples 1
Organic useless ︵ gas % ︶ purifying rate Reaction is initial 93 92 93 95 98 96 93 93 94 91
React 1000 h 90 90 91 93 96 93 90 91 92 78
Volume space velocity SV=40000h -1
Organic exhaust gas total hydrocarbon concentration=1000～8000 μ L/L;
Reactor inlet temperature=250 ℃.
Catalyst for catalytic combustion of the present invention is in evaluation procedure, and organic exhaust gas concentration fluctuates in 1000～8000 μ L/L scopes, the rapid variation of multiple high temp impact of catalyst surface experience and temperature.But each catalyst still keeps the higher organic waste-gas purification rate greater than 90% after turning round 1000 hours, so catalyst has resistance to elevated temperatures and thermal shock resistance preferably.Catalyst is not seen coating shedding in dipping process, though in use frequently experience the height fluctuation of temperature, do not take place to make reactivity decline phenomenon because of coating shedding yet.The catalyst of preparation also has higher purifying rate to organic exhaust gas in the Comparative Examples 1 when the reaction beginning, but reactivity decline is very fast, and through behind the 1000h, its purifying rate drops to 78%.In addition, the coating of catalyst has tangible obscission in the Comparative Examples 1 after the temperature shock of course of reaction, and this is to cause its organic waste-gas purification rate main reasons for decrease.Contrast finds that catalyst for catalytic combustion of the present invention has higher organic waste-gas purification rate by experiment, and in use the coating of honeycomb support is difficult for coming off, and catalyst has good high temperature resistant and thermal shock resistance.

Claims (10)

1, a kind of catalyst for catalytic combustion adopts the honeycomb support skeleton, and there is coating on honeycomb support skeleton surface, it is characterized in that the percetage by weight of each ingredients constitute coating gross weight in the described coating is: Al 2O 350%～85%, SiO 210%～40%, alkaline earth oxide 1%～10%, and dipping Pt and/or Pd are active metal component on the coating.
2,, it is characterized in that described alkaline earth oxide is selected from one or more among MgO, CaO and the BaO according to the described catalyst for catalytic combustion of claim 1.
3,, it is characterized in that described honeycomb support skeleton is the cellular structure ceramic carrier skeleton according to the described catalyst for catalytic combustion of claim 1.
4, the preparation method of the described catalyst for catalytic combustion of a kind of claim 1 is characterized in that may further comprise the steps:
(1) slurry preparation of applying coating;
(2) honeycomb substrate skeleton applying coating;
(3) active metal component dipping, dry, roasting;
Wherein the preparation process of the described applying coating slurries of step (1) is: add the gluey suspension that ammoniacal liquor is prepared aluminium hydroxide in aluminum nitrate aqueous solution, o'clock stop to add ammoniacal liquor in pH=6.5～7.0, add aluminum nitrate solution then, make and contain excessive aluminum nitrate in the suspension, the concentration of aluminum nitrate is 1～10gAl in the suspension 2O 3/ 1000mL adds the aqueous solution of Ludox and alkaline earth nitrate then in proportion in this suspension according to each components contents in the coating, stir, and mixes the coating liquid of moisture thin pulp as the honeycomb support coating with this.
5, in accordance with the method for claim 4, it is characterized in that described alkaline earth nitrate is selected from Mg (NO 3) 2, Ca (NO 3) 2And Ba (NO 3) 2In one or more.
6, in accordance with the method for claim 4, the concentration that it is characterized in that the slurries of described applying coating is to contain 50～200g solid mixed oxide in every 1000mL slurries.
7, in accordance with the method for claim 4, it is characterized in that described honeycomb support skeleton applying coating method is: the honeycomb support skeleton is taken out behind the submergence certain hour in thin pulp, through air drying and calcination process, promptly make the honeycomb support that contains coating again.
8, in accordance with the method for claim 7, it is characterized in that described honeycomb support skeleton Immersion time in thin pulp is 5～30 minutes, dry run is 60～120 ℃ of dryings 5～15 hours in air, and roasting process is 400～650 ℃ of roastings 1～5 hour in air.
9, in accordance with the method for claim 4, it is characterized in that described active metal component dipping process is for using H 2PtCl 6The aqueous solution or PdCl 2The mixed liquor that the aqueous solution or the two are made into by a certain percentage is as the maceration extract that supports the noble metal active component, and dip time is 10～40 minutes.
10, in accordance with the method for claim 4, it is characterized in that the dry run behind the described reactive metal dipping is 100～120 ℃ of dryings in air 5～20 hours, roasting process is 500～650 ℃ of roastings 1～5 hour in air.
CN 02133123 2002-10-10 2002-10-10 Catalytic combustion catalyst and preparing method thereof Expired - Lifetime CN1212889C (en)

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