Nanometer porous metal catalyst and its prepn

Abstract

The nanometer porous metal catalyst is alloy sheet of thickness 0.1-100 microns, width 0.1-20 microns and length 0.1-100 cm, in double-continuous nanometer porous structure of pore size and wall size 2-100 nm, comprising Au 80-100 at.% and Ag 0-20 at.%, and covered with black gold oxide. The preparation process of the nanometer porous metal catalyst is also disclosed, and the nanometer porous metal catalyst is prepared through electrochemical corrosion of alloy material inside strong electrolyte solution and via voltage. The nanometer porous metal catalyst has great specific surface area, and preparation process is simple and has convenient operation, high repeatability, no loss of noble metal material and other advantages.

Description

technical field [0001] The present invention relates to a novel nanostructure material catalyst and a preparation method thereof, in particular to a non-loaded catalyst that can be used for reactions such as CO oxidation at low temperature or room temperature, water gas transfer, hydrogenation and oxidation of unsaturated hydrocarbons, and reduction of nitrogen oxides. Type nanoporous metal catalyst and preparation method thereof. Background technique [0002] As we all know, Pt, Pd series noble metal catalysts have good catalytic activity, but such catalysts are expensive, the preparation process is relatively complicated, and they are prone to poisoning and lose their catalytic activity. Since the late 1980s, scientists discovered that gold nanoparticles loaded on metal oxide or activated carbon substrates have good catalytic activity (Masatake Haruta, Tetsuhiko Kobayashi "Method for the production of ultra-finegold particles immobilized on a metal oxide”US Patent, 4,839,...

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Problems solved by technology

However, these methods only focus on the corrosion of silver, and gold does not participate in the reaction. The porous gold structure of the resulting product has a relatively large pore wall size (usually above 8 nanometers), and the performance test results show that their catalytic activity is very low.

[0004] After searching, the method of preparing non-supported nanoporous metal catalysts by electrochemical corrosion of alloy materials has not been reported.

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