CN114669296A - Blocky Ru-Pt organic waste gas purification catalyst and preparation method thereof - Google Patents

Blocky Ru-Pt organic waste gas purification catalyst and preparation method thereof Download PDF

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CN114669296A
CN114669296A CN202210470826.9A CN202210470826A CN114669296A CN 114669296 A CN114669296 A CN 114669296A CN 202210470826 A CN202210470826 A CN 202210470826A CN 114669296 A CN114669296 A CN 114669296A
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catalyst
bulk
coating
exhaust gas
gas purification
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CN114669296B (en
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袁贤鑫
袁越强
方萍
周晨倩
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Hangzhou Senfa Environmental Protection Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • B01J23/63—Platinum group metals with rare earths or actinides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/002—Mixed oxides other than spinels, e.g. perovskite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/14—Gaseous waste or fumes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The invention relates to a bulk Ru-Pt organic waste gas purifying catalyst and a preparation method thereof, wherein the catalyst is prepared by coating a layer of r-Al on a thin-wall cordierite ceramic honeycomb body2O3、CeO2The catalyst carrier is composed of composite oxides of CaO and SiO, and noble metals Ru and Pt are used as main active components. The total mass of the composite oxide coating accounts for 2.0-5.0% of the mass of the carrier. Preferably r-Al2O3、CeO2And the mass ratio of CaO to SiO is 1: 0.2-0.5: 0.05-0.1. The total loading capacity of the active component Ru-Pt is 0.1-0.5g/L, and the molar ratio of Ru to Pt is 2-10: 1. the bulk Ru-Pt organic waste gas purification catalyst prepared by the invention has the advantages of relatively low raw material cost, excellent catalyst performance, high activity and good stability. The whole process of the catalyst preparation process has no harm to the environmentThe waste water and the waste gas are discharged, and the industrial production is easy to realize.

Description

Blocky Ru-Pt organic waste gas purification catalyst and preparation method thereof
Technical Field
The invention relates to a blocky Ru-Pt organic waste gas purification catalyst and a preparation method thereof. The product is applied to catalytic purification of industrial organic waste gas, eliminates the harm of organic pollutants to the environment and human health, and belongs to an environment-friendly product. The preparation method and the application thereof belong to the technical field of catalysts.
Background
The industrial organic waste gas is widely related and can be generated in the production processes of industries such as organic chemical industry, pharmaceutical chemical industry, petrochemical industry, coating, painting, printing, automobile, machinery, electronics, furniture and the like. The Organic waste gas refers to gas containing Volatile Organic Compounds (VOC for short)S) For example, aromatic hydrocarbons with low boiling points, alkanes, alkenes, ketones, alcohols, aldehydes, acids, esters and organic compounds containing Cl, N and S, which are discharged into the atmosphere without treatment, have direct harm to human health, and are also the main factors of haze generation and photochemical pollution, so various methods must be adopted for treatment. One of the most effective methods for treatment is catalytic combustion! Catalytic combustion, high purification rate, no secondary pollution, low energy consumption, energy conservation and emission reduction. The purification of organic waste gas by catalytic combustion is a widely accepted and adopted technology, and the core of the technology is a catalyst.
Catalytic combustion catalysts define from the main active component two broad classes which can be divided into noble metal types and non-noble metal types. The organic waste gas purifying catalyst used in the market is a supported catalyst which mainly comprises noble metal and takes Pt, Pd or Pt-Pd combination or Pt, Pd and Ph combination (such as a three-way catalyst for purifying automobile exhaust) as an active component, and the shape of the supported catalyst is blocky and granular. Because of its high activity, good stability and wide adaptability (broad spectrum) to different kinds of VOCs, its advantages are good compatibility! But because the resource is scarce and the price is high, and the catalyst is easy to be poisoned by elements such As Cl, S, As, P, Pb and the like, the application is limited and restricted,
scientists engaged in catalyst research have been looking for precious metal additives and substitute elements or innovated preparation process in many ways, striving to reduce the content of precious metal and have high activity and stability catalyst. In the 80 s of the last century, the catalytic research of Hangzhou university leads modified natural mordenite which is used as a carrier to load trace (0.02-0.05%) of Pt or Pd to prepare a catalyst with excellent performance, the modified natural mordenite is widely popularized and applied in tin printing and can making and coating industries and is exported to Japan in 87 years in batches.
The research and development of the noble metal catalyst are still much since the century, the applied patents are not few, and some published massive noble metal organic exhaust gas purification catalysts can be generally selected:
[ CN106378132A ] catalyst examples 4 to 7 using cordierite ceramic honeycomb bodies as carriers had Pd contents of 0.09 to 0.18 wt% and Pt contents of 0.12 to 0.27 wt%. And nitrates of Zr, K, Rh, Ca, Mg, Na and the like are respectively added as auxiliary agents.
[ CN107876050A ] Pd, Pt, the total content of Ph is 0.6-2.0 g/L.
[ CN10831472A ] Pd, the total mass of Pt is 0.5-2.5 g/L.
[ CN103831104A ] Pd, the total content of Pt is 0.55 g/L.
Ru has been reported to be less useful in catalytic combustion catalysts. [ CN1251322A]Example 3, 0.06% Pt-Pd-Ru as active component, and example 4, 0.1% Pd-Ru as active component, were applied to CO, organic wastewater COD, NH, respectively3The treatment of-N and the preparation process are complex.
[CN113996291A]Example 10, supported on CuO, TiO2，Al2O3，SiO2The Pt-Ru catalyst of the composite oxide carrier has high catalytic activity on dichloromethane and methyl bromide, the load capacity of the Pt-Ru is higher than 1%, the mass ratio of the Pt to the Ru is 4:1, the Pt is taken as the main component, the production process is complex, and the problems of waste gas and waste water exist.
The above information shows that the loading of noble metals in the prior art is still relatively high, even if the minimum amount of noble metal is 500g per cubic meter of catalyst, the maximum amount is 2500g, some is usually 0.09-0.27 wt% or more, some is even more than 1% by mass, the raw material cost is high, and the preparation process is complicated. Some carriers or coatings are prepared by using nitrates of related metal elements, such as cerium nitrate, zirconium nitrate, copper nitrate, manganese nitrate, aluminum chloride and the like. The noble metal active components are reduced by alkaline solution such as (NaOH, KOH) reducing agent after being dipped and need to be washed to be neutral, and the problem of waste gas and waste water is inevitable in industrial batch production.
Up to now, an integral industrial application catalyst which takes Ru as a main active component and can have broad-spectrum excellent catalytic activity under low load has not been found.
Disclosure of Invention
The invention aims to provide a bulk Ru-Pt organic exhaust gas purification catalyst and a preparation method thereof, aiming at the defects of the prior art. The invention takes Ru as main component, adds a small amount of Pt to form a main active component taking Ru-Pt as main component, and loads the main active component on the coating r-Al2O3、CeO2、CaO、SiO2The carrier of the thin-wall cordierite ceramic honeycomb body of the composite oxide can obtain an industrial practical catalyst with high activity, good stability and broad spectrum under low load, and the preparation method is simple and environment-friendly.
The technical scheme adopted by the invention is as follows:
a bulk Ru-Pt organic exhaust gas purification catalyst having a commercial thin-walled cordierite ceramic honeycomb body (preferably 200-300 pores/inch 2 pore density) coated with a composite oxide coating of r-Al as the catalyst support2O3、CeO2CaO, and SiO2The total mass of the oxide coating is 2.0-5.0% of the mass of the catalyst carrier. The catalyst carrier is loaded with active components Ru and Pt, the total loading capacity of the active components is 0.1-0.5g/L, and the molar ratio of Ru to Pt is 2-10: 1.
wherein r-Al is2O3、CeO2、CaO、SiO2The mass ratio of (1): 0.2-0.5: 0.05-0.1
The method for preparing the blocky Ru-Pt organic waste gas purification catalyst is prepared by adopting the physical processes of powder sand pulping and dipping coating, is environment-friendly and specifically comprises the following steps:
1) preparation of coating slurry: weighing micron-sized r-Al2O3Micron-sized Ce (OH)3、Ca(OH)2And H2O is discharged after being circularly ground in a sand mill for a certain timeStanding for more than 24 hours, and enabling the dissolved pulp to be basically uniform from top to bottom without layering and sinking;
2) and (3) coating preparation: adjusting the concentration of the slurry obtained in step 1) according to the requirements of the water absorption rate and the coating load capacity of the cordierite ceramic honeycomb body, and adding neutral silica sol to ensure that the density d of the slurry is between 1.04 and 1.09; dipping the cordierite ceramic honeycomb body into the slurry for 30-60sec, taking out the cordierite ceramic honeycomb body, blowing off the channels of the honeycomb body and the residual slurry around the honeycomb body by using compressed air (recycling), standing and drying in the shade for 12-24 h;
3) coating bonding: placing the cordierite ceramic honeycomb body obtained in the step 2) in a high-temperature oven, heating to 100-minus-one temperature and preserving heat for 1-2h, then heating to 450-minus-one temperature and preserving heat for 3-5h, and cooling to obtain a catalyst carrier;
4) loading active components: dipping the catalyst carrier obtained in the step 3) in a precursor liquid of active components Ru and Pt for 3-5sec, and taking out the liquid which is blown off from the pore channels and the periphery by compressed air (recycling).
In the above scheme, further, the r-Al2O3The powder is three types of r-Al with different crystallinity, fineness and viscosity2O3Powder is compounded, and the three types are micron-sized r-Al specially used for coatings produced by Jiangsu crystal new material company Limited2O3Powder 404, 401, 409; in the coating preparation process, the properties and the proportion of the oxide powder and the uniformity of coating slurry are good and bad, so that the bonding strength, the temperature resistance, the specific surface area and the spatial structure of the coating are influenced, and finally the dispersion degree and the electronic structure of the active component and the synergistic effect of acidity and alkalinity are influenced.
Further, 1) the rotation speed of the sand mill is 1100-1600 rpm, and the circular grinding is carried out for 60-120 min.
Further, the precursors of the active components Ru and Pt in 4) may be ruthenium chloride, ruthenium nitrate, chloroplatinic acid, platinum chloride, and platinum nitrate. Ruthenium chloride and chloroplatinic acid are preferred.
Further, 4) after dipping the active component precursor solution, taking out the solution to be decomposed and activated by microwave heating, or taking out the solution to be placed in a high-temperature oven 100-120 ℃ after standing for 8-24h, preserving the heat for 1-2h, and then rising the temperature to 400-500 ℃ to preserve the heat for 3-5h to obtain the catalystAnd (3) preparing. Microwave heating decomposition is preferred, the microwave output power is 5-25 KW, the standing time is 5-15 min, and the microwave power and the standing time can be set according to the treatment amount. The precursor solution of the active component is soaked and loaded on the catalyst carrier and decomposed by microwave heating, which is more beneficial to Ru and Pt in r-Al2O3、CeO2、CaO、SiO2The composite oxide coating generates the coupling of high-dispersion space structure, electronic structure and acid-base property, and constructs a catalytic active group. Supplying of "active groups" to the catalytic combustion process [ O](active oxygen) rate with [ O ]]The recovery rate is balanced and stable operation is achieved.
The invention has the beneficial effects that:
1. the invention takes Ru and Pt as active components, and the active components mainly take Ru, and a layer of r-Al is coated on a thin-wall cordierite ceramic honeycomb body2O3、CeO2、CaO、SiO2The composite oxide is a catalyst carrier, and the active components are impregnated and loaded; obtaining a catalyst; the Ru-Pt catalyst has a co-catalysis effect, the loading capacity of the composite oxide is only 2.0-5.0% of the catalyst carrier, more importantly, the total loading capacity of the active component Ru-Pt in the catalyst is only 0.1-0.5g/L (less than 500g per cubic meter of catalyst, equivalent to 0.016-0.085 wt% through conversion), and the Ru-Pt is mainly Ru, so that the catalyst cost can be greatly reduced.
2. The invention has low active component load, and the prepared catalyst has high catalytic activity aiming at various industrial organic waste gases such as toluene, normal hexane, cyclohexanone, ethyl acetate and butanol, has lower initial reaction temperature for the complete oxidation of VOCs of different classes, and has quite good catalyst activity. The prepared catalyst is a very practical industrial organic waste gas purifying catalyst with broad spectrum.
3. The catalyst of the invention has no waste such as waste gas and waste water which are harmful to the environment in the preparation process, which is different from the existing catalyst preparation method.
Detailed Description
In the following examples, the catalyst activity was evaluated by selecting common pollutants in industrial organic waste gas, and using toluene, n-hexane, cyclohexanone, ethyl acetate, and butanol as representative target substances. But effectiveness is not limited to these ingredients.
Space velocity: 20000h-1
Concentration: 2000-6000mg/m3
The catalyst dosage is 20-25 ml. Taking one block from the block catalyst to be made into a cylinder, putting the cylinder into a stainless steel pipe, and heating the cylinder in a tubular furnace.
Method for analysis of organic substances:
gas chromatograph, capillary chromatographic column separation and hydrogen flame ionization detection.
Data processing: an N2000 type data processing station.
Example 1
1. Preparing coating slurry: weighing micron-sized r-Al2O3Powders 404, 401 each 200g, 409: 100g, micron-sized Ce (OH)3：120g，Ca(OH)2：10g，H2O: 5000g of the slurry is placed in a charging basket of a sand mill, the rotating speed of the sand mill is 1300 rpm, the sand mill is circularly sanded for 90min, the slurry is discharged and kept still for 24 hours, the slurry is not layered and does not sink, and the slurry is basically uniform from top to bottom.
2. Preparing a coating:
taking 10 cordierite ceramic honeycomb bodies (200 pores/inch 2) [100 × 50] and weighing the total mass of the cordierite ceramic honeycomb bodies as 2650.8g and the average mass of 265.1 g/block, immersing the cordierite ceramic honeycomb bodies in clear water for 30 minutes, taking out residual water which is blown off the pore channels and the periphery of the cordierite ceramic honeycomb bodies by compressed air, weighing the total mass as 3233.1g, increasing the mass as 582.3g and average water absorption as 22.0%.
Collecting total sol amount 1/2 of step 1, using H2And O, adjusting the density of the sol to about 1.06, adding 100ml of neutral silica sol, and fully and uniformly stirring.
Immersing 10 pieces of cordierite ceramic honeycombs into the obtained sol-gel slurry, taking out for 30-60sec, and blowing the residual slurry from the channels and the periphery of the honeycombs by using compressed air (recycling). Left to dry in the shade for 24 hours.
Coating bonding: coating the obtained layer with r-Al2O3，Ce(OH)3，Ca(OH)2And placing the silica sol slurry and the dried cordierite ceramic honeycomb body in a high-temperature furnace, heating to 120 ℃, preserving heat for 2 hours, heating to 500 ℃, preserving heat for 4 hours, and cooling to obtain the catalyst carrier. Weighing the total mass: 2716.4g, increment 65.6g, average r-Al2O3、CeO2、CaO、SiO2The total mass of the composite oxide accounts for 2.5 percent of the carrier.
3. Preparation of active liquid: according to the formula Ru: molar ratio of Pt 4:1 weighing RuCl3，H2PtCl6Active solution with 0.30% concentration is prepared.
4. Loading of active liquid: and (4) soaking the cordierite ceramic honeycomb carrier prepared in the step (2) in the active liquid prepared in the step (3) for 3-5sec, taking out, and blowing off residual liquid around the honeycomb carrier pore channels by using compressed air (recycling). Decomposing by microwave heating. The total Ru-Pt loading was 0.35g/L, based on configuration theory (same for each example below).
5. The activity of the catalyst is shown in a summary table according to the process conditions and the evaluation results.
Example 2
The catalyst carrier was the same as in example 1, and the active liquid was prepared in the same manner as in example 1, except that the catalyst carrier was composed of an active component Ru: the molar ratio of Pt is 3:1, and the concentration of the active liquid is 0.20%. The impregnation method was the same as in example 1, and the total loading of Ru-Pt was 0.23 g/L.
Example 3
The catalyst carrier, active component solution preparation, loading method and dry decomposition are the same as example 1, except that the active component Ru: pt molar ratio is 5: 1, the concentration of the active liquid is 0.38%, and the total loading amount of Ru-Pt is 0.44 g/L.
Example 4
Preparation of catalyst support the same procedure as in example 1, except that the remaining sol slurry of example 1 was coated twice, and the thickness of the coating was increased so that r-Al was present2O3、CeO2、CaO、SiO2The total mass of the carrier is 4.6 percent. Preparation method of active solution, impregnation loading and dryingThe decomposition method was the same as in example 1, and Ru: the molar ratio of Pt is 2:1, the concentration of the active liquid is 0.25%, and the total load of Ru-Pt is 0.29 g/L.
Example 5
The catalyst support was the same as in example 4. In contrast to example 4, Ru: the molar ratio of Pt is 4:1, the concentration of the active liquid is 0.16 percent, and the total loading of Ru and Pt is 0.19 g/L.
Example 6
The catalyst support was prepared in the same manner as in example 1, except that r-Al was in the order of microns2O3Instead, 400g of Ce (OH) are used3Changing to 200g, adjusting the density of coating paste to d 1.08, and coating r-Al2O3、CeO2、CaO、SiO2The total mass was 3.2% of the carrier. Active solution preparation, impregnation, dry decomposition the same as in example 1, except that Ru: the molar ratio of Pt is 6:1, the concentration of the active liquid is 0.2 percent, and the total load of Ru-Pt is 0.25 g/L.
Example 7
The catalytic support is identical to example 6, except for the difference from example 6 being Ru: the molar ratio of Pt is 8: 1, the concentration of the active liquid is 0.25%, and the total loading amount of Ru-Pt is 0.30 g/L.
Summary of catalyst Activity evaluation results and VOCs removal Rate
By temperature c is meant the pre-heating temperature of the simulated exhaust gas, i.e. the inlet temperature before the catalyst.
Figure BDA0003622341190000071
As can be seen from the table, the bulk Ru-Pt organic waste gas purification catalyst provided by the invention has lower initial reaction temperature for complete oxidation of different types of VOCs, and the activity of the catalyst is quite good. It is preferable to use the product in small batch in the related factory for treating organic waste gas.

Claims (9)

1. A blocky Ru-Pt organic waste gas purification catalyst is characterized in that:
the catalyst is produced as a thin-walled cordierite ceramic honeycomb coated with an oxide coatingThe body is used as a catalyst carrier, and the oxide coating component is r-Al2O3、CeO2CaO, and SiO2The total mass of the oxide coating is 2.0-5.0% of the mass of the catalyst carrier, active components Ru and Pt are loaded on the catalyst carrier, the total loading of the active components is 0.1-0.5g/L, and the molar ratio of Ru to Pt is 2-10: 1.
2. a bulk Ru-Pt organic exhaust gas purification catalyst as recited in claim 1, wherein r-Al is selected from the group consisting of2O3、CeO2、CaO、SiO2The mass ratio of (1): 0.2-0.5: 0.05-0.1.
3. The bulk Ru-Pt organic exhaust gas purification catalyst as claimed in claim 1, wherein the thin-walled cordierite ceramic honeycomb has a pore density of 200-300 pores/inch2。
4. The method for preparing the bulk Ru-Pt organic exhaust gas purification catalyst according to claim 1, wherein the coating is prepared by a physical process of powder sand slurrying and dip coating, and specifically comprises the following steps:
1) preparation of coating slurry: weighing micron-sized r-Al2O3Micron-sized Ce (OH)3Powder, Ca (OH)2Powder and H2Grinding O in a sand mill at a high speed for a certain time in a circulating way, discharging and standing for more than 24 hours to ensure that the dissolved pulp is not layered and does not sink, and the upper part and the lower part are basically uniform;
2) preparing a coating: according to the requirements of water absorption rate and coating load capacity of cordierite ceramic honeycomb body, adding neutral silica sol and H into the obtained solution2O, the density d of the dissolved pulp is 1.04-1.09; dipping the cordierite ceramic honeycomb body into the slurry for 30-60sec, taking out the cordierite ceramic honeycomb body, blowing off the channels of the honeycomb body and the residual slurry on the periphery of the honeycomb body by using compressed air, standing and drying in the shade for 12-24 h;
3) coating bonding: placing the cordierite ceramic honeycomb body obtained in the step 2) in a high-temperature oven, heating to 100-120 ℃, preserving heat for 1-2h, heating to 450-550 ℃, preserving heat for 3-5h, and cooling to obtain a catalyst carrier;
4) loading active components: immersing the catalyst carrier obtained in the step 3) in a precursor liquid of active components Ru and Pt for 3-5sec, and taking out the liquid which is blown off from the pore channel and the periphery by using compressed air.
5. The method for preparing a bulk Ru-Pt organic exhaust gas purifying catalyst according to claim 4, wherein r-Al is2O3The powder is three types of r-Al with micron-sized powder, different crystallinity, different fineness and different viscosity2O3Powder is compounded, and the three types are micron-sized r-Al specially used for coatings produced by Jiangsu crystal new material company Limited2O3Powders 404, 401, 409.
6. The preparation method of the bulk Ru-Pt organic exhaust gas purification catalyst according to claim 4, wherein 1) the rotation speed of a sand mill is 1100-1600 rpm, and the cyclic grinding is performed for 60-120 min.
7. The method for preparing a bulk Ru-Pt organic exhaust gas purifying catalyst according to claim 4, wherein the precursors of the active components Ru and Pt in 4) are selected from ruthenium chloride, ruthenium nitrate and chloroplatinic acid, platinum chloride and platinum nitrate, preferably ruthenium chloride and chloroplatinic acid.
8. The preparation method of the bulk Ru-Pt organic exhaust gas purification catalyst according to claim 4, wherein the catalyst is prepared by taking out the active component precursor solution after dipping in 4) and decomposing and activating by microwave heating, or taking out the active component precursor solution after dipping and standing for 8-24h, then placing the active component precursor solution in a high-temperature oven at 100-120 ℃ for 1-2h, and then heating to 400-500 ℃ and preserving the temperature for 3-5 h.
9. The method for preparing a bulk Ru-Pt organic exhaust gas purifying catalyst according to claim 8, wherein the catalyst is decomposed and activated by microwave heating, the microwave output power is 5-25 KW, and the stay time is 5-15 min.
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