Nickel-silicon catalyst suitable for methane dry reforming and preparation method thereof

Abstract

The invention discloses a nickel-silicon catalyst suitable for methane dry reforming and a preparation method thereof, and the preparation method comprises the following steps: firstly, preparing silicon dioxide-loaded nickel salt from silicon dioxide and nickel salt by an impregnation method, and then calcining the silicon dioxide-loaded nickel salt at a high temperature by using mixed melamine in an N2 atmosphere to obtain a silicon dioxide-loaded Ni-N-C material; and finally, calcining the silicon dioxide loaded Ni-N-C material in air to remove most of carbon to obtain the silicon dioxide loaded nickel-based catalyst. According to the invention, silicon dioxide is taken as a carrier, a Ni-N-C material loaded by silicon dioxide is calcined in air to remove most of carbon, the nickel-silicon catalyst with good nickel dispersibility is obtained, and the catalyst shows high activity and high stability in a methane dry reforming reaction.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a nickel-silicon catalyst suitable for dry reforming of methane and a preparation method thereof. Background technique [0002] In order to solve problems such as the greenhouse effect and environmental pollution caused by the extensive use of fossil fuels, it is necessary to develop carbon capture, storage and utilization technologies, which are expected to recover and reuse the carbon emitted through energy production. use. Methane dry reforming is a promising method because it can simultaneously convert the two main greenhouse gases, carbon dioxide and methane, into syngas (hydrogen and carbon dioxide). Continuous conversion to fuel to recycle CO 2 , on the other hand, the high endothermicity of methane dry reforming will enable efficient storage of renewable energy. [0003] Precious metals show excellent catalytic activity and anti-carbon depositi...

AI Technical Summary

Problems solved by technology

[0003] Noble metals exhibit excellent catalytic activity and anti-coking properties in methane dry reforming, but their high prices make them difficult to apply in industry

Nickel-based catalysts have attracted extensive attention from researchers due to their low cost and high catalytic activity. However, problems such as catalyst sintering and carbon deposition have hindered their commercial application.

Silica is often used as a substrate for dispersing nickel because of its excellent thermal stability and high specific surface area, while most nickel-silicon catalysts with better catalytic performance are prepared through complex and expensive routes, such as using silicon precursors It is still a challenge to prepare an encapsulated structure and obtain a catalyst with good catalytic performance by simple loading of commercial silica

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