Preparation method of raney nickel catalyst suitable for slurry reactor methanation and application thereof

Abstract

The invention discloses a preparation method a raney nickel catalyst suitable for slurry reactor methanation. The content of nickel in the raney nickel catalyst is 86wt%-95wt%, and the specific surface area of the raney nickel catalyst is between 85m<2> / g and 180m<2> / g. The raney nickel catalyst has the advantages of high intensity and activity and is suitable for slurry reactor methanation.

Description

technical field [0001] The invention relates to a Raney nickel catalyst and a preparation method, in particular to a Raney nickel catalyst suitable for slurry bed methanation, a preparation method and an application. Background technique [0002] Raney nickel (Raney Ni) catalyst is a very important industrial catalyst, which has high activity and selectivity and low production and use cost, and has been widely used in the catalytic hydrogenation reaction of organic matter. Raney Ni catalyst was first discovered by Murray Raney and applied for a patent in 1925. When the catalyst is prepared, the Al in the aluminum-nickel alloy is first dissolved with NaOH solution, and then washed. The residue is a skeleton structure similar to a sponge. The catalyst mainly contains Ni and Al, and the total specific surface area is 50-130m 2 / g. [0003] The traditional method of preparing Raney nickel is to extract the prepared nickel-aluminum alloy with a certain concentration of alkali s...

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Problems solved by technology

However, the particle size of the nickel foam in this preparation method has been fixed, and the nickel foam is impregnated with aluminum, and the particle size and pore structure of the nickel foam have substantial changes after the aluminum is extracted with alkali.

[0007] The methanation catalysts disclosed in the above two patents are all fixed-bed catalysts, but there are few reports about the application of Raney nickel to methanation. The preparation of industrial nickel-aluminum alloy powder or the use of finished Raney nickel catalyst, but the detailed preparation process of the catalyst using industrial nickel-aluminum alloy powder is not given in the patent, nor the performance characteristics of the catalyst; and the use of finished catalyst is mainly for fixed bed Catalysts developed whose catalyst structure and strength are not optimal for slurry bed reactors

Moreover, the catalyst prepared by this method has the defects of uneven distribution of pores and low mechanical strength. When the air velocity of the feed gas is large or the stirring speed is high, the catalyst is easily broken and falls off, reducing the catalytic performance of the catalyst.