Cerium modified supported type nickel-based catalyst as well as preparation method and application thereof

Abstract

The invention discloses a cerium modified supported type nickel-based catalyst as well as a preparation method and an application thereof. In the catalyst, metallic nickel particles and metallic cerium particles are uniformly dispersed in surfaces and pore channels of titanium dioxide supporters. The preparation method of the catalyst comprises steps as follows: the titanium dioxide supporters are impregnated with a nickel nitrate and cerium nitrate mixed aqueous solution with an incipient-wetness impregnation method, dried, roasted and reduced in hydrogen stream, and the catalyst is prepared. The catalyst has lower preparation and use cost; compared with a traditional skeletal nickel catalyst, the catalyst overcomes side reactions of hydrogenated dehalogenation, addition of a dehalogenation inhibitor is not needed, selectivity of a product is high, quality of the product is good, and the catalyst can be applied to a reaction for preparing halogenated aromatic amine from haloaromatic nitrocompounds through catalytic hydrogenation.

Description

technical field [0001] The invention relates to a cerium-modified supported nickel-based catalyst, a preparation method and application thereof. Background technique [0002] Halogenated aromatic amines are an important class of organic chemical intermediates, widely used in the synthesis of fine chemicals such as medicine, dyes and pigments. [0003] Halogenated aromatic amines are generally prepared from halogenated aromatic nitro compounds through reduction reactions, mainly including chemical reduction and catalytic hydrogenation reduction. Chemical reduction methods include iron powder reduction method, alkali sulfide reduction method and hydrazine hydrate reduction method, etc., but these reduction methods have disadvantages such as large environmental pollution, low product yield, and poor product quality, and have been gradually eliminated. The catalytic hydrogenation reduction method has the advantages of high yield, good product quality, mild reaction environment,...

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Problems solved by technology

However, the preparation process of the modified catalyst is more complicated, and the addition of auxiliary elements increases the difficulty of recycling the precious metal catalyst.

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