Preparation method of adjustable-specific-area porous-structure nano multimetallic catalyst

Abstract

The invention relates to a preparation method of an adjustable-specific-area porous-structure nano multimetallic catalyst, which specifically comprises the steps of preparation of catalyst precursor precipitate, standing of precipitate, hydrothermal treatment on precipitate, reduction of precipitate, alkali washing of precipitate, water washing of precipitate and the like. Several soluble metal salt solutions and soluble alkalis are subjected to double decomposition reaction to generate the precipitate of hydroxides of the metals; the obtained precipitate and the mother solution system are stood for some time; the precipitate is subjected to hydrothermal treatment to further perform reduction by using hydrogen under certain conditions; the reduced metal-state substance is subjected to alkali washing treatment; and finally, the product is subjected to water washing to obtain the finished catalyst product. The invention creatively provides a preparation method of the non-supported multimetallic catalyst with adjustable specific area. The method has the advantages of short processing steps, simple operating process and no discharge of three wastes; and the catalyst has the advantages of uniform properties, stable catalytic performance, high catalytic activity and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a preparation method of a nano-scale multi-metal catalyst with an adjustable specific surface and a porous structure. Background technique [0002] There are many methods for preparing solid catalysts, among which impregnation method, precipitation method, co-precipitation method, microemulsion method, ion exchange method, chemical reduction method and chemical mixing method have been studied more. The above-mentioned preparation methods all consume time and energy in the catalyst preparation process, and all have the disadvantages of high energy consumption, uneconomical, etc., and therefore all have the problem of being unfavorable to industrialization. However, the co-precipitation method to prepare catalysts overcomes to a certain extent the low catalyst activity, short life, poor dispersion of active components on the carrier, low purity, less research, and far...

AI Technical Summary

Problems solved by technology

The above-mentioned preparation methods all consume time and energy in the catalyst preparation process, and all have disadvantages such as high energy consumption and uneconomical, so there are problems that are not conducive to industrialization

However, the co-precipitation method to prepare catalysts overcomes to a certain extent the low catalyst activity, short life, poor dispersion of active components on the carrier, low purity, less research, and far away from industrialization in other preparation methods. The cost of raw materials is relatively high, and the large-scale preparation is uneconomical. It also solves the problem of poor dispersion of active components, increases the specific surface and hydrophilicity of the catalyst, and improves the selectivity of the catalytic target product.