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Catalytic combustion catalyst and preparing method thereof

A catalytic combustion and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. Inactivation of organic waste gas adaptability and other issues, to achieve the effect of strong processing adaptability, easy operation and industrial production, preparation method and equipment are simple

Active Publication Date: 2013-06-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the organic waste gas catalytic combustion catalysts mentioned above are prepared by the method of honeycomb carrier, slurry coating and precious metal impregnation. The catalytic combustion catalyst with noble metal as the active component has the advantage of high activity and has a high removal rate for ordinary organic waste gas, but , the above-mentioned catalysts have disadvantages and deficiencies such as poor stability, low activity, easy deactivation and poor adaptability to different organic waste gases when dealing with high-temperature and high-space-velocity organic waste gases, especially the catalytic combustion catalyst prepared by slurry coating cannot adapt to the gas volume The drastic change of the exhaust gas concentration and the drastic temperature change due to the fluctuation of the exhaust gas concentration. At this time, the catalyst coating will fall off due to aging, which will affect the effect of the catalyst, thereby reducing or even losing the catalytic combustion treatment ability of organic waste gas.

Method used

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  • Catalytic combustion catalyst and preparing method thereof
  • Catalytic combustion catalyst and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Soak the honeycomb ceramic carrier with a size of 100mm×100mm×50mm in dilute hydrochloric acid with a mass concentration of 1% for 2 hours, wash the carrier and the dilute acid liquid under microwave for 2 hours, take it out and blow dry, and place it in a refrigerator at 100°C. After 6 hours in an oven, the obtained carrier was fired for 5 hours to obtain a clean and dry honeycomb ceramic carrier for use.

[0021] Use distilled water as a solvent to prepare a cerium nitrate solution with a concentration of 0.3 mol / L, add an appropriate amount of citric acid to make the pH of the solution 4, stir at 70°C for 6 hours, and use ammonia water to adjust the pH value to 7.9 to produce stable cerium Sol spare.

[0022] Select the average particle size of 10 ~ 200nm, SiO 2 Ammonia cationic silica sol with a content of 25%, put the pretreated carrier into the silica sol for 30 minutes, take it out, blow out the slurry in the channel with compressed air, dry at 160°C for 6 hours...

Embodiment 2

[0025] Soak the honeycomb ceramic carrier with a size of 100mm×100mm×50mm in dilute hydrochloric acid with a mass concentration of 2% for 2 hours, wash the carrier and the dilute acid liquid under microwave for 2 hours, take it out, blow dry, and place it in a 110°C refrigerator. After 4 hours in an oven, the obtained carrier was fired for 5 hours to obtain a clean and dry honeycomb ceramic carrier for use.

[0026] Use distilled water as a solvent to prepare a cerium nitrate solution with a concentration of 0.15mol / L, add an appropriate amount of citric acid to make the pH of the solution 5, stir at 90°C for 4 hours, and use ammonia water to adjust the pH value to 8.5 to form a stable sol for later use .

[0027] Select the average particle size of 10 ~ 200nm, SiO 2 For decationized silica sol with a content of 30%, put the pretreated carrier into the silica sol for 15 minutes and take it out, blow out the slurry in the pores with compressed air, dry at 110°C for 4 hours, an...

Embodiment 3

[0030] Soak the honeycomb ceramic carrier with a size of 100mm×100mm×50mm in dilute hydrochloric acid with a mass concentration of 1% for 6 hours, wash the carrier and the dilute acid liquid under microwave for 4 hours, take it out and dry it, and place it in a 70°C refrigerator. After 6 hours in an oven, the obtained carrier was fired for 5 hours to obtain a clean and dry honeycomb ceramic carrier for use.

[0031] Use distilled water as a solvent to prepare a cerium nitrate solution with a concentration of 0.1mol / L, and add an appropriate amount of citric acid to make the pH of the solution 5, stir at 110°C for 12 hours, use ammonia water to adjust the pH value to 7.5, and form a stable sol for later use .

[0032] Select the average particle size of 10 ~ 200nm, SiO 2 For sodium cationic silica sol with a content of 20%, put the pretreated carrier into the silica sol for 40 minutes and take it out, blow out the slurry in the pores with compressed air, dry at 70°C for 4 hour...

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Abstract

The invention discloses a catalytic combustion catalyst and a preparing method thereof. Such catalytic combustion catalyst takes honeycomb ceramics as the carrier, and the surface of the honeycomb ceramics is respectively provided with a SiO2 coating and a CeO2 coating. Counted by the total weight of the coatings, the coatings contain 80wt%-95wt% of activated SiO2 and 5wt%-20wt% of CeO2. The surface of the coatings is loaded with activated components of metallic elements including Pt, Zr and La, in which the molar ratio of the metallic elements Pt, Zr and La is 0.1-1:1, 5-4.5:1.5-4. The carrying amount of activated component of precious metal Pt is 0.2-3.5g for each litre of catalyst. A method for preparing catalytic combustion catalyst, comprising the steps of preprocessing the carrier, preparing the sol, coating the carrier sol and loading the metal activated components. The catalytic combustion catalyst provided by the invention has very high coating firmness and high-temperature activity as well as stability in the process of catalyzing and combusting the organic waste gas; moreover, such catalytic combustion catalyst has good treatment effect for the waste gas with different high temperature and high air speed.

Description

technical field [0001] The invention relates to a catalytic combustion catalyst and a preparation method thereof, in particular to a highly active and stable 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, coating, and paint processing industries. A large amount of organic waste gas not only pollutes the environment, but also seriously endangers human health. 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 the characteristics of high efficiency and low temperature, and has been more and more widely used. In order to ensure the circulation of exhaust gas and reduce the loss of press...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J35/04B01J37/02B01D53/86B01D53/72
Inventor 刘新友陈玉香王学海
Owner CHINA PETROLEUM & CHEM CORP
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