A kind of preparation method of synthetic gas methanation catalyst

Abstract

The invention relates to a method for preparing a synthesis gas methanation catalyst. The preparation method of the catalyst firstly prepares a catalyst precursor A; then uses a reducing atmosphere to reduce the catalyst precursor A; and combines the reduced catalyst precursor A with The polyol solution is added to the autoclave for hydrogenation reaction, the reaction effluent is placed and then filtered and dried to obtain the catalyst precursor B; the active component precursor and the second auxiliary agent precursor are dissolved in water to obtain the solution C , and then add the catalyst precursor B, after drying and roasting, the catalyst is obtained. The method of the invention promotes the dispersion of more active components on the carrier surface, not only improves the utilization rate of active metals, but also improves the conversion rate of carbon monoxide and the selectivity of products.

Description

Technical field [0001] The invention relates to a preparation method of a synthesis gas methanation catalyst, in particular to a preparation method of a synthesis gas methanation supported nickel-based catalyst. Background technique [0002] Methanation refers to CO / CO 2 With H 2 Under certain temperature, pressure and catalyst, CH is generated 4 At present, this reaction is widely used in the removal of trace carbon in the synthesis of ammonia or hydrogen, the methanation of coke oven gas, and the production of natural gas from coal. Methanation is an important catalytic technology, especially in the field of fuel applications, which can be used to increase the calorific value of fuel gas and allow the conversion of coke oven gas, coal or biomass to natural gas. In recent years, with the rapid development of my country's coal-based substitute natural gas industry, methanation as one of the core technologies has received more and more attention. [0003] China is a country with "r...

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Problems solved by technology

[0006] Although the catalysts prepared by the above-mentioned patented methods have obtained better synthesis gas methanation reaction performance, because the reaction is a fast reaction (this kind of fast reaction is generally carried out under the condition of mass transfer control), the reactants in The reaction is completed when it reaches the outer surface of the catalyst, so the inner surface of the catalyst does not contribute much to the target reaction, which results in lower metal utilization in the carrier pores and increases the preparation cost of the catalyst

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