In-suit loaded type foam microporous precious metal catalyst, and preparation method thereof

Abstract

The invention discloses an in-suit loaded type foam microporous precious metal catalyst, and a preparation method thereof. According to the preparation method, an amorphous alloy wire with a cross section area of S0 (or a woven product of the amorphous alloy wire) is taken as a precursor, and is immersed in an acid solution for corrosion of the amorphous alloy at certain depth of the external surface of the amorphous alloy wire through dealloying reaction so as to obtain a nanometer porous precious metal catalytic layer, and at the same time, a amorphous wire core with a cross section area ofS(S<S0) is maintained as a structure support, so that the in-suit loaded type foam microporous precious metal catalyst with a foam microporous precious metal annular external shell catalytic layer andan internal amorphous wire core composite structure. The preparation method is low in cost, is simple in operation, and is controllable, and is capable of producing the precious metal catalyst material with an excellent structure and excellent performance.

Description

technical field [0001] The invention relates to the technical field of nanometer metal materials, in particular to an in-situ supported foam microporous noble metal catalyst and a preparation method thereof. Background technique [0002] A noble metal catalyst is a noble metal material that can change the rate of a chemical reaction without itself participating in the final product of the reaction. Since the d electron orbitals of noble metal elements are not filled, the surface is easy to adsorb reactants, and the strength is moderate, which is conducive to the formation of intermediate "active compounds", so it has high catalytic activity, and also has high temperature resistance, oxidation resistance, corrosion resistance, etc. Comprehensive excellent properties, is currently the most important catalyst material. [0003] In practical applications, in order to ensure the performance of the catalyst and reduce the amount of noble metal used as much as possible, the most e...

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Problems solved by technology

[0004] However, since the microstructure of the foam microporous noble metal catalyst is in the shape of three-dimensional "bridged" foam micropores, and generally exists in the form of strips or blocks, there is no good dispersibility, so it is difficult to obtain a catalyst similar to that of noble metal nanoparticles. The method used is loaded on the above carrier

In addition, since bulk or strip-shaped foamed microporous noble metal catalyst materials are generally brittle, it is difficult to process them into specific physical shapes and better mechanical structure stability without a carrier according to the needs of practical applications. catalyst material, thus greatly limiting its further wide application

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