Preparation method of perovskite type oxide modified activated carbon catalyst loaded with noble metal

Abstract

The invention discloses a preparation method of a perovskite type oxide modified activated carbon catalyst loaded with noble metal. The noble metal is platinum or palladium, and the noble meatl loading capacity is 1-5% by weight. The preparation method comprises the steps that 1, perovskite type oxide modified activated carbon is prepared; 2, the perovskite type oxide modified activated carbon isadded into an alkaline solution for uniform stirring, and heat-preservation impregnation is performed to obtain activated carbon slurry; 3, a noble metal compound is dissolved in diluted hydrochloricacid to obtain an active component solution; 4, the active component solution is added into the activated carbon slurry, and uniform stirring and heat-preservation impregnation are carried out to obtain activated carbon slurry containing the noble metal; 5, a reducing agent and lye are added into the activated carbon slurry containing the noble metal, filtration is performed after reduction to obtain a filter cake, and the filter cake is washed to obtain the perovskite type oxide modified activated carbon catalyst loaded with the noble metal. The prepared noble metal catalyst has high reactionactivity, high selectivity and good stability, and metal is not easily lost during use.

Description

technical field [0001] The invention belongs to the technical field of preparation of noble metal catalysts, and in particular relates to a preparation method of a perovskite-type oxide-modified activated carbon-supported noble metal catalyst. Background technique [0002] As a catalyst support for noble metals, activated carbon has the advantages of high specific surface area, rich pore structure, acid and alkali resistance, and easy recovery of precious metals. Precious metal catalysts prepared with activated carbon as a carrier have been widely used in the preparation and production of fine chemicals. Different types of activated carbon have different surface physical and chemical properties, resulting in large differences in the performance of the prepared catalysts. Therefore, the research on the influence of the modification of activated carbon support on the performance of noble metal catalysts has become a research hotspot in the field of noble metal catalyst prepar...

AI Technical Summary

Problems solved by technology

In this method, activated carbon is modified by perovskite-type oxides, and perovskite-type oxides with special catalytic effects are introduced into the activated carbon structure, and the surface structure of activated carbon is modified during the formation of perovskite-type oxides. It also plays a structural guiding role in the formation of perovskite-type oxides. The two interact and influence each other, overcoming the influence of impurities in activated carbon itself on the catalyst, and the disadvantages of single structure and low catalytic performance of perovskite-type oxides; On the modified activated carbon, according to its structural characteristics, adopt the deposition precipitation method to load precious metals, and use formaldehyde to reduce, which ensures the complete reduction of active metal components and the generation of "eggshell" distribution and small size in the pores of activated carbon. Precious metal particles, the prepared precious metal catalyst has high reactivity, high selectivity and good stability, and the metal is not easy to lose during use

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