Self-optimizing alloy catalyst as well as preparation method and application thereof

Abstract

The invention belongs to the field of alloy catalysts, and particularly discloses a self-optimizating alloy catalyst and a preparation method and application thereof. The preparation method comprisesthe following steps that (1) Ag elementary substance, Cu elementary substance and Al elementary substance are subjected to vacuum melting, AgXCuYAlZ alloy is prepared, wherein X+Y+Z = 100 and the ratio of X to Y to Z is (15-30):(0.1-1):(69-84.9); (2) the alloy is subjected to melt-spinning to preapre an alloy strip; (3) the aluminum is removed from the alloy strip by using acid to obtain an initial catalyst; (4) electrochemical treatment then is carried out on the initial-state catalyst to segregate Cu on the Ag surface, thereby obtaining the catalyst. The alloy catalyst prepared by the invention is a catalytic material with a self-optimizing function, is stable in catalytic performance, is high in current density and catalytic efficiency after being optimized, is suitable for mass production, and is beneficial to industrial application.

Description

technical field [0001] The invention belongs to the field of alloy catalysts, and in particular relates to a self-optimizing alloy catalyst and its preparation method and application. Background technique [0002] The catalytic activity and stability of catalysts are two core issues in the field of catalysis. In the catalytic reaction of alloy catalysts, as the reaction time increases, the catalytic performance of the catalyst will generally decrease to varying degrees, especially involving nanoscale catalysts. , because of its high surface free energy, although it can have high-efficiency catalytic performance in a short period of time, it is extremely easy to condense as the working time increases, resulting in a decline in catalytic performance. [0003] CN101722009B discloses a nano-Au catalyst and its preparation method and application. It specifically discloses Au and additives supported on a mixed oxide mainly composed of copper oxide. The additives are selected from ...

AI Technical Summary

Problems solved by technology

The Ag / Cu double alloy catalyst of this technical solution has excellent thermal conductivity, electrical conductivity and high catalytic activity. As the reaction time increases, both Ag and Cu nanoparticles are extremely prone to agglomeration and sintering, and the catalytic performance continues to decline.

[0005] Therefore, the prior art still needs a catalyst that can solve the problem of poor catalyst stability and significantly reduced catalytic activity after long-term use.

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