Catalyst with double-alloy composite micro-mesoporous structure as well as preparation method and application of catalyst

Abstract

The invention provides a catalyst with a double-alloy composite micro-mesoporous structure, a preparation method and application, the catalyst comprises a catalyst active component and a catalyst carrier, the catalyst active component comprises double alloys, the double alloys comprise a nickel-tin alloy and a nickel-lanthanum alloy, and the catalyst carrier comprises silicon dioxide with a micro-mesoporous structure; due to the existence of the double alloys, the electronic structure around active metal nickel particles can be effectively adjusted, adsorption and activation of methane and carbon dioxide are promoted, the activity of the catalyst is improved, and the carbon deposition resistance and the sintering resistance of the nickel particles are improved; through the silicon dioxidecatalyst carrier with the composite micro-mesoporous structure, the dispersity of active components of the catalyst can be improved, the sintering of nano nickel particles is inhibited, the carbon deposition phenomenon of the catalyst is reduced, and the activity and stability of the catalyst are improved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a catalyst with a double-alloy composite micro-mesoporous structure, a preparation method and an application. Background technique [0002] Methane (CH 4 ) and carbon dioxide (CO 2 ) is the main source of gas that causes the global warming effect, and is also an important carbon-containing resource. Promoting its efficient utilization of resources has important environmental protection significance and economic value. [0003] Through methane carbon dioxide (CH 4 -CO 2 ) reforming reaction can effectively utilize these two greenhouse gases to produce H 2 Syngas with a / CO ratio close to 1 is used as raw material for further carbonylation and Fischer-Tropsch synthesis to reduce CO 2 emission, which is of environmental significance. Also, by CH 4 -CO 2 The reforming reaction realizes the transformation of chemical energy, and can also transport external energy such as solar...

AI Technical Summary

Problems solved by technology

[0004]At present, in the CH4-CO2 reforming conversion process, the catalysts are mainly divided into noble metal catalysts (Ru, Pd, Pt, etc.) and non-noble metal catalysts (Fe, Co, Ni, etc.), among them, noble metal catalysts have good catalytic activity and carbon deposition resistance, but because noble metal catalysts are expensive, scarce resources, and under high temperature conditions The active components of noble metal catalysts will be sintered and lost, making it difficult to apply on a large scale; non-precious metal catalysts will cause catalyst deactivation faster due to carbon deposition and other reasons, so the stability of non-precious metal catalysts is poor, but non-precious metal catalysts are cheap and easy to obtain. Therefore, it has attracted much attention

Among non-precious metal catalysts, nickel has the best catalytic activity. However, nickel-based catalysts are prone to carbon deposition under long-term high-temperature reactions, which can easily cause catalyst deactivation.

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