Core-shell cerium oxide-coated nickel catalyst for methanation, and preparation method and application thereof

Abstract

The invention specifically relates to a core-shell cerium oxide-coated nickel catalyst for methanation, and a preparation method and application thereof, belonging to the field of preparation and application of methanation catalysts used for synthesis of substituted natural gas. The preparation method comprises the following steps: (1) preparation of core-shell nickel oleate-coated HPS sphere; (2) preparation of a precursor solution capable of forming a cerium oxide shell layer; and (3) preparation of a Ni-coated HPs-coated CeO2 precursor. The preparation method for the core-shell cerium oxide-coated nickel catalyst used for methanation is advanced, has accurate and detailed data and produces the catalyst with high quality and high purity, as high as 98%; the produced catalyst can effectively inhibit migration, agglomeration and sintering of the active component Ni at high temperature through confinement effect of the shell layer, prevents growth of Ni crystal grains to inhibit carbon deposit and has high catalytic activity, high methane selectivity and good stability; and the preparation method is an ideal method for preparation of the anti-sintering and anti-carbon deposit methanation catalyst.

Description

technical field [0001] The invention relates to the field of preparation and application of a synthetic replacement natural gas methanation catalyst, in particular to a core-shell type cerium oxide-coated nickel methanation catalyst and its preparation method and application. Background technique [0002] Energy and the environment are two major challenges facing the sustainable development of human society. my country's long-term coal-based energy consumption structure has led to increasingly prominent environmental problems. Among them, natural gas, as a clean energy with high calorific value, can effectively reduce the occurrence of smog weather and total carbon emissions. Therefore, the development of coal-based natural gas is of great significance to realize the clean and efficient utilization of coal and alleviate the contradiction between supply and demand of natural gas. [0003] The key technology of coal-to-natural gas is methanation reaction, which refers to CO o...

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Problems solved by technology

[0004] The present invention provides a core-shell type cerium oxide-coated nickel methanation catalyst and its preparation method and application in order to solve the problem that the catalyst activity of the methanation catalyst is reduced due to sintering and carbon deposition.

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