Nickel-carbon catalyst, preparation method and application thereof

Abstract

The invention provides a nickel-carbon catalyst, a preparation method and application thereof in 2,2'-dipyridyl synthesis. The nickel-carbon catalyst takes a carbon material as a catalyst carrier, andtakes any one or a combination of several of nickel or nickel oxides as an active ingredient. The nickel-carbon catalyst has the characteristics of being low in price, high in activity, long in service life and high in selectivity in synthesizing 2,2'-dipyridyl.

Description

technical field [0001] The invention belongs to the fields of fine chemical industry and organic synthesis, and in particular relates to a preparation method of a nickel-carbon catalyst and its application in the synthesis of 2,2'-bipyridine. Background technique [0002] 2,2'-bipyridine is an important intermediate in chemical and pharmaceutical synthesis. The suitable industrial preparation method is to use pyridine as raw material for one-step dehydrogenation coupling to generate 2,2'-bipyridine. The key to this reaction lies in the activity of the catalyst. and longevity. The catalysts that have been reported include Raney nickel (GB897473) and supported nickel (US5416217). Among them, the highest catalytic activity of Raney nickel is 0.1g / g / h, the life is about 50h, and the activity of supported nickel catalyst is 0.05g / g / h. h, life expectancy is about 500h. Although the supported nickel catalyst produces more products per unit mass, its carrier is generally alumina, ...

AI Technical Summary

Problems solved by technology

Although the supported nickel catalyst produces more products per unit mass, its carrier is generally alumina, and the presence of acidic centers leads to the cracking of pyridine, which brings unnecessary by-products, such as piperidine and 2-picoline, etc., by-products The generation of increased separation steps of the process

In addition, the combination of nickel and alumina in the supported nickel catalyst supported by alumina is relatively firm, and it is not easy to recover metallic nickel.

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