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Method for preparing honeycomb ceramic type perovskite integral catalyst adopting goyazite oxide as coating

A monolithic catalyst and oxide coating technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve surface structure changes, easy peeling, damage, etc. problems, to avoid severe shedding and improve thermal stability

Inactive Publication Date: 2011-11-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in fact, due to 12SrO·7Al 2 o 3 The surface is extremely alkaline, and it is very easy to hydrolyze with water when it is mixed with water, resulting in changes and damage to its surface structure, so that it cannot achieve good contact with honeycomb ceramics after forming a slurry, and it is very easy to fall off when coating and firing. It is also easy to interact with the active components after passing through a high temperature environment, and it is difficult to effectively support the active components and improve the thermal stability of the catalyst.

Method used

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  • Method for preparing honeycomb ceramic type perovskite integral catalyst adopting goyazite oxide as coating

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: 12SrO·7Al 2 o 3 Preparation of coating material

[0027] Sr(NO 3 ) 2 and NaOH dissolved in a certain amount of deionized water, stirring at room temperature to Sr(NO 3 ) 2 NaOH was slowly added dropwise to the solution to the end point, left to crystallize, washed with deionized water and absolute ethanol, dried, and the obtained sample was mixed with Al 2 o 3 Mix according to the ratio of Sr / Al=12.5:14, ball mill, and roast at 900°C under the protection of nitrogen to obtain strontium aluminite oxide 12SrO·7Al 2 o 3 .

Embodiment 2

[0028] Example 2: Containing 12SrO·7Al 2 o 3 Preparation of Strontite Oxide Coated Honeycomb Ceramics

[0029] Get a certain amount of strontium aluminate oxide 12SrO 7Al that embodiment 1 makes 2 o 3 and ethanol (mass ratio 2:98), mixed and ball milled for 1 h to obtain 2wt% 12SrO·7Al 2 o 3 Coating slurry, then immersing the cordierite honeycomb ceramic skeleton in the slurry, taking it out after immersion for 20min, drying in the air, drying overnight at 110°C, and firing at 850°C for 6h, repeating the above steps of dipping, drying, drying, and roasting if necessary, 12SrO·7Al containing about 1wt% and 2wt% strontite oxide 2 o 3 Coated cordierite honeycomb ceramic substrate xS 12 A 7 (Org) / CH, wherein, x is the content of strontium aluminite on cordierite.

Embodiment 3

[0030] Example 3: Containing 12SrO·7Al 2 o 3 Preparation of Strontite Oxide Coated Honeycomb Ceramics

[0031] Get a certain amount of strontium aluminate oxide 12SrO 7Al that embodiment 1 makes 2 o 3 and ethanol (mass ratio of 8:92), mixed and ball milled for 2.5h to obtain 8wt% of 12SrO·7Al 2 o 3 Coating slurry, then immersing the cordierite honeycomb ceramic skeleton in the slurry, taking it out after immersion for 20min, drying in the air, drying overnight at 110°C, and firing at 850°C for 6h, repeating the above steps of dipping, drying, drying, and roasting if necessary, Obtained 12SrO·7Al containing 4wt% and 6wt% strontium aluminate oxide 2 o 3 Coated cordierite honeycomb ceramic substrate xS 12 A 7 (Org) / CH.

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Abstract

The invention discloses a method for preparing honeycomb ceramic type perovskite integral catalyst adopting goyazite oxide as a coating. The method comprises the following steps: (1) mixing goyazite oxide and alcohol solvent to prepare coating grout, loading goyazite oxide with target content by soaking the coating grout on the surface of honeycomb ceramics, drying and roasting to obtain a honeycomb ceramic carrier containing a goyazite oxide coating; (2) mixing perovskite type oxide and water to prepare active component grout, loading perovskite type oxide by soaking the active component grout on the surface of the honeycomb ceramic carrier containing the goyazite oxide coating, drying and roasting to obtain the integral catalyst. The coating grout prepared by adopting alcohol as the solvent can maintain the surface structure of the goyazite oxide and realize the close contact and effective coating between the goyazite oxide and honeycomb ceramics, and the prepared integral catalyst is obviously improved in aspects of catalytic activity, thermal stability, and the like.

Description

technical field [0001] The invention relates to a preparation method of a catalytic combustion catalyst, in particular to a preparation method of a honeycomb ceramic type perovskite monolithic catalyst coated with strontium aluminite oxide. Background technique [0002] As an exhaust gas treatment technology, catalytic combustion can effectively remove small molecule volatile organic compounds contained in exhaust gas and completely oxidize them to CO at a lower temperature. 2 and H 2 O. In recent years, with people's emphasis on environmental issues, this technology has received a lot of research at home and abroad. [0003] The key to catalytic combustion lies in the efficiency of the catalyst. The development of efficient catalysts is the key to catalytic combustion technology. The catalysts currently being studied can be divided into noble metal catalysts and non-noble metal oxide catalysts according to the type of active components. At present, in practice, in order ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/10B01J23/02B01J37/02B01J37/08B01D53/86B01D53/72
Inventor 张泽凯王占龙刘华彦卢晗锋陈银飞
Owner ZHEJIANG UNIV OF TECH
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