Catalyst for catalytic combustion and preparation method thereof

A catalytic combustion and catalyst technology, which is applied in the direction of catalyst activation/preparation, combustion methods, physical/chemical process catalysts, etc., can solve the problems of easy cracking of the coating, unfavorable industrialization, peeling, etc., and achieve simple preparation methods, promotion of penetration, Good penetration and wetting properties

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problem that the coating is easy to crack and peel off, but the time and frequency of ultrasonic pretreatment are strictly controlled to avoid excessive coll

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

[0036] Cordierite pretreatment: The cordierite honeycomb ceramic is completely immersed in 5wt% nitric acid solution for 1 hour. After taking it out, it is rinsed with deionized water 3 times, and placed in an oven at 120°C for 10 hours to obtain Surface activated cordierite honeycomb ceramic carrier.

[0037] Preparation of aluminum sol: add 20 grams of pseudo-boehmite to 150 mL of deionized water, and add 7 grams of concentrated nitric acid dropwise while stirring. After stirring for a certain period of time, heating to 80°C, adding nitric acid dropwise to complete peptization, controlling the pH of the solution at 2-5, aging for 24 hours, to obtain a transparent aluminum sol with a content of 8wt% based on alumina.

[0038] Preparation of silicon-aluminum coating slurry: firstly mix 90 grams of aluminum sol with 6 grams of fumed silica, and add 4 grams of fatty alcohol polyoxyethylene ether (the molecular formula is RO(CH 2 CH 2 O) 5 H, where R is C 7 ~C 9 ) Af...

Example Embodiment

[0043] Example 2

[0044] After mixing 5 g / L platinum nitrate solution and 5 g / L palladium nitrate solution in equal volume, it is used as the active component liquid. Others are the same as in Example 1. The carrier coated with the silicon-aluminum coating and the composite coating obtained in this embodiment is ZT2, the final product is CT2, and the platinum-palladium loading is 0.05 wt% of the total weight of the catalyst.

Example Embodiment

[0045] Example 3

[0046] Cordierite pretreatment: the same as in Example 1.

[0047] Aluminum sol is a commercially available product (solid content is 15%, pH is 3-4).

[0048] Preparation of silicon-aluminum coating slurry: first mix 87 grams of aluminum sol with 10 grams of fumed silica, and add 3 grams of alkylphenol polyoxyethylene ether (the molecular formula is RC 6 H 4 O(CH 2 CH 2 O) n H, where R is C 9 ~C 12 , N is 9~12) After stirring and mixing for 30 minutes, the coating liquid can be obtained.

[0049] Preparation of composite coating slurry: add 54 grams of nano titanium dioxide (50-100nm), 32 grams of fumed white carbon black (10-80nm), and 17.2 grams of nano cerium oxide into 280ml of carbonic acid solution (0.2mol / L) and stir well Then, add 43 grams of aluminum sol to it, stir and mix for 90 minutes until uniform, add 4.3 grams of alkylphenol polyoxyethylene ether (the molecular formula is RC 6 H 4 O(CH 2 CH 2 O) n H, where R is C 9 ~C 12 , N is 9~12), stir and mix ...

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Abstract

The invention discloses a catalyst for catalytic combustion and a preparation method thereof. The catalyst takes cordierite honeycomb ceramics as a substrate, wherein a silicon-aluminum coating, a composite coating and an active ingredient are arranged on the surface of the substrate in sequence; based on the total weight of the catalyst, the catalyst contains 80 to 90 weight percent of the cordierite honeycomb ceramics, 2 to 9 weight percent of the silicon-aluminum coating, 3 to 10 weight percent of the composite coating, and 0.01 to 1 weight percent of the active ingredient, wherein the active ingredient is one or more of Pt, Pd, Rh, Ru and Ir, and preferably Pt or Pd; based on the total weight of the silicon-aluminum coating, the silicon-aluminum coating contains 10 to 50 weight percent of silicon dioxide and 50 to 90 weight percent of aluminum oxide; based on the total weight of the composite coating, the composite coating comprises 40 to 80 weight percent of titanium dioxide, 5 to 35 weight percent of silicon dioxide, 1 to 10 weight percent of aluminum oxide, and 10 to 40 percent of an auxiliary, wherein the auxiliary is selected from one or more of cerium oxide, zirconium oxide or lanthanum oxide. According to the catalyst for the catalysis of the combustion disclosed by the invention, the coating loading capacity is high; the firmness is high; the poisoning resistance and the activity of the catalyst are high; the preparation method is simple; therefore, the catalyst is suitable for industrial application.

Description

technical field [0001] The invention relates to a catalytic combustion catalyst and a preparation method thereof. Background technique [0002] Volatile organic compounds (VOCs) are produced in the petroleum refining industry and the electronics, printing, and paint processing industries. A large amount of organic waste gas is seriously endangering human health. Most VOCs have peculiar smell, damage certain organs of the human body, cause lesions, and even cause cancer; in addition, VOCs react photochemically with ozone to produce photochemical smog; some VOCs are flammable and explosive, which brings hidden dangers to enterprise production. With the improvement of people's living standards, the requirements for the living environment are getting higher and higher, and the effective treatment of this type of gas has attracted widespread attention. Among the technologies for treating VOCs, the catalytic combustion method has received more attention due to its low energy con...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J37/02F23G7/07
Inventor 杨爱霞刘淑鹤王学海陈玉香
Owner CHINA PETROLEUM & CHEM CORP
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