Preparation method and application of integral combustion catalyst for platinum-based honeycomb iron-chrome-aluminium wire mesh

Abstract

The invention discloses a preparation method and application of an integral combustion catalyst for a platinum-based honeycomb iron-chrome-aluminium wire mesh. In the preparation method provided by the invention, a chemical plating technology is adopted, chloroplatinic acid is used as platinum salt, ethylenediamine and ethylene diamine tetraacetic acid disodium salt are used as a complexing agent, sodium borohydride is used a reducing agent, and an iron-chrome-aluminium wire mesh is used as a substrate; precious metals can be loaded directly without precoating an aluminum oxide film on the surface of the substrate of the metal wire mesh, therefore, the preparation method is simple and convenient, and the needed equipment is also very simple; the platinum component in the prepared catalyst is firmly loaded on the surface of the substrate of the metal wire mesh, therefore, no peeling and falling phenomena are caused in a bending test and an adhesion tape test; meanwhile, the content of platinum as the precious metal in the integral combustion catalyst prepared by the invention is only 0.05-0.3wt%, however, when the integral combustion catalyst is used for the catalytic combustion and purification treatment of methylbenzene, the conversion rate of the methylbenzene can be up to over 90% at lower temperature of about 180 DEG C, therefore, an excellent low-temperature catalytic purification effect is achieved.

Description

Technical field [0001] The invention relates to a preparation method and application of a platinum-based honeycomb iron-chromium-aluminum wire mesh integral combustion catalyst. Background technique [0002] Precious metals (Pd, Pt) are widely used in the catalytic combustion of volatile organic compounds (VOCs) due to their excellent low-temperature catalytic activity and good stability. At present, most of its supporting methods are impregnation methods, and it is rare to prepare monolithic catalysts by electroless plating technology to support precious metal active components. Chinese patent 201110064279.6 discloses a method for preparing a palladium-based honeycomb monolithic combustion catalyst, which adopts electroless plating technology, using palladium chloride as palladium salt, ammonia water as complexing agent, and sodium hypophosphite as reducing agent on stainless steel wire mesh The catalyst prepared by loading palladium has high activity, high temperature resistan...

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Problems solved by technology

[0003] Platinum has better low-temperature catalytic activity than palladium, but there are few reports on the preparation of monolithic combustion catalysts by direct chemical plating of platinum on iron-containing metal substrates by electroless plating technology, and the chemical plating solution formula of Chinese patent 201110064279.6 cannot make Platinum Deposition on FeCrAl Mesh

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