Method for producing raney nickel catalyst

Abstract

The invention provides a method for preparing a raney nickel catalyst. The method comprises the following steps: in the presence of solid sodium hydroxide and aluminum nickel alloy, leaching the solid mixture by distilled water, then reacting the mixture at a temperature of between 40 and 65 DEG C for 0.5 to 1 hour, removing lye on the upper layer; and in the atmosphere of hydrogen, washing the mixture by the distilled water until the mixture is neutral to obtain the raney nickel catalyst. The obtained raney nickel catalyst has specific surface area of between 80 and 220 square meters per gram, and has quite high activity which is even 3 to 4 times higher than that of the prior catalytic activity; besides, the method saves the time for preparing the catalyst compared with the prior catalyst; and because the catalyst also contains certain amount of aluminum metal, the method creates a condition for the further regeneration of the catalyst, and expands the application range of the catalyst. In particular in the reaction for preparing tetrahydrofuran through the hydrogenation of furan, the furan conversion rate is between 45 and 100 percent, and the selectivity of the tetrahydrofuran is between 70 and 100 percent.

Description

technical field [0001] The invention relates to a method for preparing a Raney nickel catalyst. Background technique [0002] Raney nickel (Raney Ni) catalyst is a very important industrial catalyst, because of its high activity, high selectivity and low production and use costs, it has been widely used in organic reduction reactions, such as: Catalytic hydrogenation and dehalogenation of olefins, aromatic rings, aldehydes, ketones, nitro groups, cyano groups, etc., is one of the important catalysts for industrial applications, because of its low cost, simple preparation, and high activity. It has always been the focus of catalyst researchers. [0003] Raney nickel catalyst was first discovered by Murray Raney (1885~1966) and applied for a patent in 1925. During preparation, first use NaOH solution to dissolve Al in Al-Ni alloy, then wash, the residue is a sponge-like skeleton structure, the catalyst mainly contains Ni and Al, and the total specific surface area is 50-130m...

AI Technical Summary

Problems solved by technology

Adding alloy powder to lye is a complex process that consumes time and is not easy to control

In addition, the residence time of the first batch of alloy added in the lye is much longer than that of the last batch of alloy added, so the obtained product will be very uneven

In the 1980s, it was mentioned that adding water to the mixed solution of NaOH and alloy powder, but the research on its in-depth and specific leaching conditions has not been reported, and the traditional leaching method is still used in industry