CN102000570A - Pd/Ce0.8Zr0.2O2/cordierite honeycomb ceramic monolithic catalyst, preparation method and application thereof - Google Patents
Pd/Ce0.8Zr0.2O2/cordierite honeycomb ceramic monolithic catalyst, preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a Pd/Ce0.8Zr0.2O2/cordierite honeycomb ceramic monolithic catalyst, a preparation method and application thereof. The catalyst is prepared by taking cordierite honeycomb ceramic which is eroded by hydrochloric acid as a first carrier, a cerium-zirconium composite oxide as a second carrier, and a precious metal, namely palladium (Pd) as an active ingredient; preparing a cerium-zirconium composite coating on the cordierite carrier by an immersion method; immersing the carrier into plating solution; and directly reducing palladium onto the cordierite honeycomb ceramic coated with the cerium-zirconium composite coating by the redox reaction of palladium chloride and sodium hypophosphite and the self-catalysis of the palladium. The preparation method improves the oxygen storage performance of the catalyst, improves high-temperature resistance, and realizes uniform load of nano-palladium particles on the carriers without embedding active sites; moreover, the using amount of the palladium is small, the utilization rate of the palladium is improved, the process is simple, the preparation period is short, and the production cost is low. The monolithic catalyst prepared by the method has high activity and high stability; and the methylbenzene can be oxidized into harmless carbon dioxide (CO2) and water (H2O) in the presence of the catalyst at the temperature of 220 to 300 DEG C.
Description
Technical field
The present invention relates to a kind of precious metals pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer and preparation method thereof, this catalyst are used for the catalytic combustion of toluene to be handled.
Background technology
No matter be production processes such as, rubber synthetic now in petrochemical industry, coating, medicine, in the technologies such as the degreasing of still printing, baking vanish, electronic devices and components, film fabric coating, all can discharge benzene,toluene,xylene, ethyl acetate, acetone, methyl alcohol, formaldehyde etc. and contain VOC (VOCs) (Volatile Organic Compounds) waste gas.These pernicious gas majorities are inflammable and explosive, and its a large amount of dischargings have not only produced to local region environment but also to earth environment and seriously influenced, and are one of reasons that causes Atmospheric Photochemical Smog, greenhouse effects and depletion of the ozone layer.Simultaneously, volatile organic waste gas is again the polluter that is detrimental to health, usually be accompanied by peculiar smell, stench distributes in air, eye, nose, respiratory tract to the people have spread effect, to internal organ and nervous system generation adverse effects such as the heart, lung, livers, even cause acute and slow poisoning, can carcinogenic, mutagenesis.
Production by Catalytic Combustion Process is when one of effective method of pre-treatment volatile organic waste gas (VOCs), be a kind of using energy source and exhaust gas treatment technology of efficient, environmental protection, it makes VOCs carry out flameless combustion under lower initiation temperature by the effect of catalyst and resolves into carbon dioxide and water.
At present, the catalytic burning integral type catalyst adopts cordierite honeycomb ceramic as matrix mostly, and cordierite honeycomb ceramic has that low pressure drop, low thermal coefficient of expansion, geometrical surface are big, high mechanical properties and high heat resistanceheat resistant vibration advantages such as (1400 ℃ of heat resisting temperatures); Normal applying coating is as second carrier on the cordierite honeycomb ceramic surface, in numerous coating materials, and CeO
2-ZrO
2Compound be always since by the big quantity research of people, mainly be because this compound shows outstanding storage oxygen evolution performance, good high-temperature heat endurance and excellent low-temperature catalyzed performance.Therefore, CeO
2-ZrO
2Composite oxides are considered to have most at present the coating material of potential using value.Precious metals pd, Pt etc. have high catalytic activity, Heat stability is good, initiation temperature is low and lower to the requirement of reactor material etc., therefore, this class active constituent loading are had better industrial application prospects on carrier.Noble metal active component carrying method often adopts infusion process, disperses more evenly though the method prepares the catalyst active component, and the active component desired concn is big, the load capacity of wayward active component.People such as Zhang Qingbao have reported that in catalysis journal 29 (4) 373～378 soluble-salt with Ce, Zr and Pd is a precursor, adopt the method for disposable while immersion coating to prepare Pd/Ce
0.8Zr
0.2O
2/ substrate integer catalyzer, major defect are that prepared specific surface area of catalyst is less, only are 5.9m
2/ g, and active component Pd is unfavorable for improving the utilization rate of palladium easily by embedding, and the load capacity of palladium is wayward, and this point also can obviously be seen from the SEM figure that it is reported.People such as Li Yushan have reported in Industrial Catalysis 14 (7) 57-59 and have adopted electroless plating method to prepare the palladium fine catalyst on Al-Ce-Zr-Fe-Mn powder composite oxides, be applied to cleaning catalyst for tail gases of automobiles, but this fine catalyst is not suitable for being applied to the big integral catalyzer of diameter.People such as Li Yongfeng have reported in the patent of being declared and have directly adopted electroless plating method to prepare platinum palladium fine catalyst on cordierite honeycomb ceramic, have been applied to the toluene catalytically burning.Between platinum palladium noble metal and the cordierite honeycomb ceramic, lack the CeO of the well behaved high high-temp stability of storage oxygen evolution in the prepared catalyst of this method
2-ZrO
2Composite oxide coating is as second carrier, and at high temperature easy-sintering influences catalyst activity etc.Reported in patent (application number 200710029199.0) and carrying out chemical palladium-plating on the cordierite honeycomb ceramic behind the alkali corrosion, its committed step is that the cordierite ceramic carrier that will handle through highly basic is immersed in NaH earlier
2PO
2A period of time in the reducing solution is dipped into it in the solution of Pd again and plates palladium, repeats aforesaid operations twice, and add CeO in the solution of Pd
2, NiCl
26H
2O powder particle auxiliary agent carries out modification, improves the adsorbance and the dispersed uniform of palladium.Its major defect is CeO
2Particle is all insoluble in soda acid, so CeO
2Poor at the plating bath suspension, easily be deposited to the solution bottom, and Pd easily is attracted to CeO
2On the particle and co-precipitation is got off, cause Pd and CeO
2Loss reduces Pd and CeO
2Load capacity on the cordierite ceramic carrier; And this method does not form yet and contains CeO
2Second carrier of coating.And the present invention is applying CeO with infusion process earlier on the cordierite honeycomb ceramic of hcl corrosion
2-ZrO
2Coating adopts then and use PdCl simultaneously in same solution as second carrier
2Carry out chemical palladium-plating with reducing agent as plating bath, technology is more simple, more helps improving the utilization rate of palladium.Method of the present invention prepares Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer, and the catalytic combustion that is applied to toluene handles, and do not appear in the newspapers as yet.
Summary of the invention
The purpose of this invention is to provide a kind of Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer and its production and application, this catalyst are mainly used in the catalytic combustion of toluene and handle.
The present invention adopts the combination of infusion process and electroless plating method to prepare a kind of precious metals pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer, this integral catalyzer cordierite honeycomb ceramic after with hcl corrosion is first carrier, is second carrier with the cerium zirconium compound oxide of immersion process for preparing, is active component with the precious metals pd in the chemical plating load.Wherein the mol ratio of cerium zirconium is 4: 1, CeO
2-ZrO
2The load capacity of coating is 1.0～6.0wt%, and the precious metals pd load capacity is 0.06～0.6wt%, and specific area is 6.56-18.23m
2/ g.
It is as follows that this invents concrete preparation process:
(1) to the surface preparation of cordierite honeycomb ceramic carrier: cordierite honeycomb ceramic carrier heated in the dilute hydrochloric acid solution of 10wt% boiled 30 minutes, take out with the clean back 120 ℃ of dry 1h of distilled water flushing;
(2) immersion process for preparing cerium zirconium composite: with Ce (NO
3)
36H
2O and Zr (NO
3)
45H
2O is mixing in 4: 1 in molar ratio, the citric acid of 1.2 times of metal ion total mole numbers is joined in the mixed solution of cerium zirconium, stir 60min under 40 ℃ of water-baths, the honeycomb ceramic carrier that step (1) was handled is impregnated in this mixed solution then, dipping 3h, solution residual in the hole is blown away in taking-up, natural air drying, 120 ℃ of dry 2h, 400 ℃ of roasting 1h in Muffle furnace, repeat said process again 2 times, make Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic carrier;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: it is 1～10.0g/L SnCl that the cordierite honeycomb ceramic carrier that step (2) was handled is impregnated into concentration
2With 5～10min in the sensitizing solution of 30mL/L hydrochloric acid, take out with distilled water and clean; Be immersed in the PdCl that concentration is 0.05～0.10g/L then
2With 5～10min in the activating solution of the hydrochloric acid of 1mL/L, take out with distilled water and clean;
(4) preparation chemical palladium plating solution: chemical plating fluid is by the PdCl of 0.05～0.50g/L
2, 5.0g/L 38wt% concentrated hydrochloric acid, the 25wt% ammoniacal liquor of 80mL/L and the ammonium chloride of 13.5g/L of inferior sodium phosphate, 23mL/L form;
(5) chemical palladium-plating: the honeycomb ceramic carrier that step (3) was handled is immersed in the chemical plating fluid, 30 ℃ of heated at constant temperature 30～60min, 40 ℃ of constant temperature 30～60min again, and then 50 ℃ of constant temperature 30～60min, last 60 ℃ of constant temperature do not produce to there being bubble, take out with distilled water and clean, at last at 120 ℃ of dry 2h, 120～900 ℃ of roasting 3h can obtain required Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer.
Preparation CeO in the described step (2)
2-ZrO
2The load capacity of coating is 1.0～6.0wt%.
The load capacity of precious metals pd is 0.06～0.60wt% in the integral catalyzer for preparing in the described step (5).
The hole density of above-mentioned used cordierite honeycomb ceramic is 400 hole/inches
2Thick with hole wall is the commercial product of 0.1mm.
The Pd/Ce of the present invention's preparation
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer is applicable to the catalytic combustion processing of toluene.
The present invention has following outstanding advantage and beneficial effect:
The present invention adopts infusion process and electroless plating method to prepare a kind of precious metals pd/Ce
0.8Zr
0.2O
2The integral catalyzer of/cordierite honeycomb ceramic, with the cordierite honeycomb ceramic behind the hcl corrosion is first carrier, cerium zirconium complex chemical compound is second carrier, precious metals pd is an active component, this integral catalyzer not only coat is firm, and having catalytic activity preferably, good temperature resistance and heat endurance are fit to industrialization promotion and use.
Production by Catalytic Combustion Process is removed toluene and is made toluene carry out flameless combustion under lower temperature by the effect of this integral catalyzer to resolve into carbon dioxide and water, can toluene be changed into CO fully at 220 ℃～300 ℃ with the catalyst of the present invention's preparation
2And H
2O is a kind of exhaust gas treatment technology of efficient, environmental protection.
Storage oxygen performance, heat-resisting quantity, heat endurance and realization nanometer palladium particulate that preparation method of the present invention can improve catalyst at carrier than uniform load, can be with active sites embedding (can clearly not see) from accompanying drawing 1, help improving the utilization rate of palladium, improve the catalytic performance of catalyst.
Description of drawings
Fig. 1 is the embodiment of the invention 4 obtained Pd/Ce
0.8Zr
0.2O
2The SEM figure of/cordierite honeycomb ceramic integral catalyzer.
The Pd/Ce that Fig. 2 prepares for the present invention
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer palladium, load capacity is to the graph of a relation that influences of toluene catalytically combustion transformation capability.
The Pd/Ce that Fig. 3 prepares for the present invention
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer, sintering temperature is to the graph of a relation that influences of toluene catalytically combustion transformation capability.
The specific embodiment
In order to further specify the present invention, enumerate following examples, but do not limit the scope of the invention.
Embodiment 1
(1) ceramic honey comb surface preparation: with hole density is 400 hole/inches
2With wall thickness be that the cordierite honeycomb ceramic of 0.1mm boiled in the 10wt% dilute hydrochloric acid solution 30 minutes, take out with the clean back 120 ℃ of dry 1h of distilled water flushing;
(2) immersion process for preparing cerium zirconium composite: configuration 0.16moL/L Ce (NO
3)
36H
2O, 0.04moL/L Zr (NO
3)
45H
2The mixed solution of O and 0.24moL/L citric acid, under 40 ℃ of water-baths, stir 60min, the honeycomb ceramic carrier that step (1) was handled is impregnated in this mixed solution then, dipping 3h takes out and blows away solution residual in the hole, natural air drying, 120 ℃ of dry 2h, 400 ℃ of roasting 1h in Muffle furnace repeat said process 2 times again, make Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic carrier;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: it is 10.0g/L SnCl that the cordierite honeycomb ceramic carrier that step (2) was handled is impregnated into concentration
2With 10min in the sensitizing solution of 30mL/L hydrochloric acid, take out with distilled water and clean; Be immersed in the PdCl that concentration is 0.10g/L then
2With 10min in the activating solution of the hydrochloric acid of 1mL/L, take out with distilled water and clean;
(4) preparation chemical palladium plating solution: chemical plating fluid is by the PdCl of 0.10g/L
2, 5.0g/L 38wt% concentrated hydrochloric acid, the 25wt% ammoniacal liquor of 80mL/L and the ammonium chloride of 13.5g/L of inferior sodium phosphate, 23mL/L form;
(5) chemical palladium-plating: the honeycomb ceramic carrier that step (3) was handled is immersed in the chemical plating fluid, 30 ℃ of 40min of heated at constant temperature, 40 ℃ of constant temperature 40min again, and then 50 ℃ of constant temperature 40min, last 60 ℃ of constant temperature do not produce to there being bubble, taking-up is cleaned with distilled water, and at last at 120 ℃ of dry 2h, 500 ℃ of roasting 3h can obtain 0.06wt%Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer;
(6) the catalytic combustion properties evaluation of integral catalyzer: the cuboid Pd/Ce that will be of a size of 15mm * 15mm * 25mm
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer is cut into and is 7mm * 7mm * 15mm cuboid, in the catalytic reaction stove of then this catalyst being packed into.
In the air band people reacting furnace of toluene by certain flow rate, its concentration is 4.0g/m
3, air speed is 10000h
-1The concentration of toluene in reactant and product adopts Agilent GC-6820 type gas chromatographicanalyzer (FID) to analyze, and evaluation result is seen accompanying drawing 2.
Embodiment 2
(1) ceramic honey comb surface preparation: press the method operation among the embodiment 1;
(2) immersion process for preparing cerium zirconium composite: press the method operation among the embodiment 1;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: press the method operation among the embodiment 1;
(4) preparation chemical palladium plating solution: press the method preparation among the embodiment 1, PdCl
2Concentration is 0.10g/L;
(5) chemical palladium-plating: press the method operation among the embodiment 1, can obtain 0.12wt%Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer;
(6) the catalytic combustion properties evaluation of integral catalyzer: press the method operation among the embodiment 1, evaluation result is seen accompanying drawing 2.
Embodiment 3
(1) ceramic honey comb surface preparation: press the method operation among the embodiment 1;
(2) immersion process for preparing cerium zirconium composite: press the method operation among the embodiment 1;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: press the method operation among the embodiment 1;
(4) preparation chemical palladium plating solution: press the method preparation among the embodiment 1, PdCl
2Concentration is 0.20g/L;
(5) chemical palladium-plating: press the method operation among the embodiment 1, can obtain 0.24wt%Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer;
(6) the catalytic combustion properties evaluation of integral catalyzer: press the method operation among the embodiment 1, evaluation result is seen accompanying drawing 2.
Embodiment 4
(1) ceramic honey comb surface preparation: press the method operation among the embodiment 1;
(2) immersion process for preparing cerium zirconium composite: press the method operation among the embodiment 1;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: press the method operation among the embodiment 1;
(4) preparation chemical palladium plating solution: press the method preparation among the embodiment 1, PdCl
2Concentration is 0.30g/L;
(5) chemical palladium-plating: press the method operation among the embodiment 1, can obtain 0.36wt%Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer.
(6) the catalytic combustion properties evaluation of integral catalyzer: press the method operation among the embodiment 1, evaluation result is seen accompanying drawing 2.
Embodiment 5
(1) ceramic honey comb surface preparation: press the method operation among the embodiment 1;
(2) immersion process for preparing cerium zirconium composite: press the method operation among the embodiment 1;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: press the method operation among the embodiment 1;
(4) preparation chemical palladium plating solution: press the method preparation among the embodiment 1, PdCl
2Concentration is 0.40g/L;
(5) chemical palladium-plating: press the method operation among the embodiment 1, can obtain 0.48wt%Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer;
(6) the catalytic combustion properties evaluation of integral catalyzer: press the method operation among the embodiment 1, evaluation result is seen accompanying drawing 2.
Embodiment 6
(1) ceramic honey comb surface preparation: press the method operation among the embodiment 1;
(2) immersion process for preparing cerium zirconium composite: press the method operation among the embodiment 1;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: press the method operation among the embodiment 1;
(4) preparation chemical palladium plating solution: press the method preparation among the embodiment 1, PdCl
2Concentration is 0.50g/L;
(5) chemical palladium-plating: press the method operation among the embodiment 1, can obtain 0.60wt%Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer;
(6) the catalytic combustion properties evaluation of integral catalyzer: press the method operation among the embodiment 1, evaluation result is seen accompanying drawing 2.
Embodiment 7
(1) ceramic honey comb surface preparation: press the method operation among the embodiment 1;
(2) immersion process for preparing cerium zirconium composite: press the method operation among the embodiment 1;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: press the method operation among the embodiment 1;
(4) preparation chemical palladium plating solution: press the method preparation among the embodiment 1, PdCl
2Concentration is 0.30g/L;
(5) chemical palladium-plating: press the method operation among the embodiment 1,120 ℃ of roasting 3h can obtain 0.36wt%Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer;
(6) the catalytic combustion properties evaluation of integral catalyzer: press the method operation among the embodiment 1, evaluation result is seen Fig. 3.
Embodiment 8
(1) ceramic honey comb surface preparation: press the method operation among the embodiment 1;
(2) immersion process for preparing cerium zirconium composite: press the method operation among the embodiment 1;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: press the method operation among the embodiment 1;
(4) preparation chemical palladium plating solution: press the method preparation among the embodiment 1, PdCl
2Concentration is 0.30g/L;
(5) chemical palladium-plating: press the method operation among the embodiment 1,300 ℃ of roasting 3h can obtain 0.36wt%Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer;
(6) the catalytic combustion properties evaluation of integral catalyzer: press the method operation among the embodiment 1, evaluation result is seen accompanying drawing 3.
Embodiment 9
(1) ceramic honey comb surface preparation: press the method operation among the embodiment 1;
(2) immersion process for preparing cerium zirconium composite: press the method operation among the embodiment 1;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: press the method operation among the embodiment 1;
(4) preparation chemical palladium plating solution: press the method preparation among the embodiment 1, PdCl
2Concentration is 0.30g/L;
(5) chemical palladium-plating: press the method operation among the embodiment 1,700 ℃ of roasting 3h can obtain 0.36wt%Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer;
(6) the catalytic combustion properties evaluation of integral catalyzer: press the method operation among the embodiment 1, evaluation result is seen accompanying drawing 3.
Embodiment 10
(1) ceramic honey comb surface preparation: press the method operation among the embodiment 1;
(2) immersion process for preparing cerium zirconium composite: press the method operation among the embodiment 1;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: press the method operation among the embodiment 1;
(4) preparation chemical palladium plating solution: press the method preparation among the embodiment 1, PdCl
2Concentration is 0.30g/L;
(5) chemical palladium-plating: press the method operation among the embodiment 1,900 ℃ of roasting 3h can obtain 0.36wt%Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer;
(6) the catalytic combustion properties evaluation of integral catalyzer: press the method operation among the embodiment 1, evaluation result is seen accompanying drawing 3.
Claims (5)
1. Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer, it is characterized in that: the cordierite honeycomb ceramic of this integral catalyzer after with hcl corrosion is first carrier, cerium zirconium compound oxide with immersion process for preparing is second carrier, is active component with the precious metals pd in the chemical plating load.
2. described Pd/Ce of claim 1
0.8Zr
0.2O
2The preparation method of/cordierite honeycomb ceramic integral catalyzer is characterized in that may further comprise the steps:
(1) to the surface preparation of cordierite honeycomb ceramic carrier: cordierite honeycomb ceramic carrier heated in the dilute hydrochloric acid solution of 10wt% boiled 30 minutes, take out with the clean back 120 ℃ of dry 1h of distilled water flushing;
(2) immersion process for preparing cerium zirconium composite: with Ce (NO
3)
36H
2O and Zr (NO
3)
45H
2O mixes for 4:1 in molar ratio, the citric acid of 1.2 times of metal ion total mole numbers is joined in the mixed solution of cerium zirconium, stir 60min under 40 ℃ of water-baths, the cordierite honeycomb ceramic carrier that step (1) was handled is impregnated in this mixed solution then, dipping 3h, solution residual in the hole is blown away in taking-up, natural air drying, 120 ℃ of dry 2h, 400 ℃ of roasting 1h in Muffle furnace, repeat said process again 2 times, make Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic carrier;
(3) Ce
0.8Zr
0.2O
2The sensitization of/cordierite honeycomb ceramic carrier and activation processing: it is 1～10.0g/L SnCl that the cordierite honeycomb ceramic carrier that step (2) was handled is impregnated into concentration
2With 5～10min in the sensitizing solution of 30mL/L hydrochloric acid, take out with distilled water and clean; Be immersed in the PdCl that concentration is 0.05～0.10g/L then
2With 5～10min in the activating solution of the hydrochloric acid of 1mL/L, take out with distilled water and clean;
(4) preparation chemical palladium plating solution: chemical plating fluid is by the PdCl of 0.05～0.50g/L
2, 5.0g/L 38wt% concentrated hydrochloric acid, the 25wt% ammoniacal liquor of 80mL/L and the ammonium chloride of 13.5g/L of inferior sodium phosphate, 23mL/L form;
(5) chemical palladium-plating: the cordierite honeycomb ceramic carrier that step (3) was handled is immersed in the chemical plating fluid, 30 ℃ of heated at constant temperature 30～60min, 40 ℃ of constant temperature 30～60min again, and then 50 ℃ of constant temperature 30～60min, last 60 ℃ of constant temperature do not produce to there being bubble, take out with distilled water and clean, at last at 120 ℃ of dry 2h, 120～900 ℃ of roasting 3h can obtain required Pd/Ce
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer.
3. preparation method according to claim 2 is characterized in that: preparation CeO in the described step (2)
2-ZrO
2The load capacity of coating is 1.0～6.0wt%.
4. preparation method according to claim 2 is characterized in that: the load capacity of precious metals pd is 0.06～0.60wt% in the integral catalyzer for preparing in the described step (5).
5. the Pd/Ce of the described preparation method of claim 2 preparation
0.8Zr
0.2O
2/ cordierite honeycomb ceramic integral catalyzer is applicable to the catalytic combustion processing of toluene.
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