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Catalytic combustion catalyst and preparing method thereof

A catalytic combustion and catalyst technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem that the combination of coating and honeycomb ceramic carrier is not strong enough, reduce the effective utilization rate of precious metals, and reduce the use of catalysts. performance and other issues, to achieve the effect of good high temperature resistance, high effective utilization, and not easy to peel off the coating

Inactive Publication Date: 2004-04-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of this catalyst and its preparation method is: due to the direct use of mixed oxides to prepare the water-containing slurry of the coated coating, the combination of the coating and the honeycomb ceramic carrier is not strong enough, and the coating is prone to peeling off during use, thereby Reduce the performance of the catalyst; and a considerable part of the platinum group noble metal component is covered by metal oxides, which greatly reduces the effective utilization of the noble metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] The preparation method of the catalytic combustion catalyst with firm coating bonding, high temperature resistance and effective utilization of precious metal active components comprises the following specific steps:

[0013] (1) Add ammoniacal liquor to the aluminum nitrate aqueous solution to prepare a colloidal suspension containing aluminum hydroxide, stop adding ammoniacal liquor when pH=6.5~7.0, and add an appropriate amount of aluminum nitrate solution to make the suspension contain an excessive amount of Aluminum nitrate, the concentration of aluminum nitrate in the suspension is 1-10gAl 2 o 3 / 1000mL. Then add the aqueous solution of silica sol and alkaline earth metal nitrate in proportion to the suspension according to the content of each component in the coating, stir evenly, and mix the aqueous slurry as the coating liquid of the honeycomb ceramic carrier coating. The alkaline earth metal nitrate is Mg(NO 3 ) 2 , Ca(NO 3 ) 2 , Ba(NO 3 ) 2 Any one or...

Embodiment 1

[0018] Measure 100mL concentration to be 50g Al 2 o 3 Al(NO 3 ) 3 Aqueous solution, slowly add 20% (V / V) dilute ammonia water to pH = 7.0 under stirring, add 2mL concentration of 50g Al 2 o 3 Al(NO 3 ) 3 Aqueous solution, continue stirring for 10 minutes, add 133mL concentration of 30g SiO 2 / 100mL solution of silica sol, then add 100mL concentration of 10g MgO / 100mL solution of Mg(NO 3 ) 2 For the aqueous solution, add clean water until the total volume of the aqueous slurry is 1000mL, stir until uniform, and use the aqueous slurry as the coating solution for the honeycomb ceramic carrier coating.

[0019] The size is 72×72×50mm, and the opening rate is 300cell / in 2 The honeycomb ceramic carrier skeleton is immersed in the above water-containing slurry, taken out after immersion for 10 minutes, and the residual slurry in the pores is removed with compressed air, then dried at 60°C for 15 hours in the air, and calcined at 550°C for 2 hours in the air to obtain the Ho...

Embodiment 2

[0022] Measure 110mL concentration to be 50g Al 2 o 3 Al(NO 3 ) 3Aqueous solution, under stirring, slowly add 20% (V / V) dilute ammonia water to pH = 6.5, add 4mL concentration of 50g Al 2 o 3 Al(NO 3 ) 3 Aqueous solution, continue stirring for 10 minutes, add 117mL concentration of 30g SiO 2 / 100mL solution of silica sol, then add 50mL concentration of Mg(NO 3 ) 2 Aqueous solution and 50mL Ba(NO 3 ) 2 For the aqueous solution, add clean water until the total volume of the aqueous slurry is 1000mL, stir until uniform, and use the aqueous slurry as the coating solution for the honeycomb ceramic carrier coating.

[0023] The size is 72×72×50mm, and the opening rate is 300cell / in 2 The honeycomb ceramic carrier skeleton is immersed in the above-mentioned water-containing slurry, taken out after 20 minutes of immersion, and the residual slurry in the pores is removed with compressed air, then dried at 100°C in the air for 8 hours, and calcined at 400°C in the air for 5 h...

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Abstract

The invention refers to a kind of catalyst in organic waster gas purification. It is made up of honeycomb pottery carrier and the paint layer on the carrier, and the precious metal active components. The layer has characters such as stable paint layer, excellent high temperature resistant performance, the efficiency is high. The paint layer is made up of Al2O3, SiO2 and a one kind of or more alkali metal oxide. The paint layer combines with the honeycomb pottery carrier stably.

Description

1. Technical field [0001] The invention relates to a catalytic combustion catalyst and a preparation method thereof, more specifically, to a catalytic combustion catalyst for purifying organic waste gas and a preparation method thereof. 2. Background technology [0002] As a treatment method for organic waste gas, catalytic combustion refers to the deep oxidation of organic molecules on the surface of the catalyst under the action of a catalyst, so that the organic waste gas is converted into harmless carbon dioxide and water. Therefore, catalytic combustion is also called catalytic complete oxidation or catalytic deep oxidation. Catalytic combustion, as a simple and practical organic waste gas purification technology, has attracted more and more attention. Chinese patent 88100589 discloses a "catalyst for purifying exhaust gas and its production method". This catalyst is composed of a honeycomb carrier with a monolithic structure and a coating on it. The catalyst composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01J23/40B01J35/04B01J37/025
Inventor 李东旭
Owner CHINA PETROLEUM & CHEM CORP
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