Nitrogen-and-phosphorus co-doped carbon-based cobalt catalyst and preparation method thereof, and synthetic method of saturated aliphatic primary amine

Abstract

The invention provides a nitrogen-and-phosphorus co-doped carbon-based cobalt catalyst and a preparation method thereof, and a synthesis method of saturated aliphatic primary amine. The nitrogen-and-phosphorus co-doped carbon-based cobalt catalyst comprises 0.5-15% of cobalt, 0.1-5% of phosphorus and 1-10% of nitrogen. The carbon-based cobalt catalyst has good catalytic hydrogenation activity, the nitrogen-doped carbon layer of the carbon-based cobalt catalyst has alkalinity, and the carbon layer has a coating structure, so the catalyst is high in stability, has relatively high catalytic activity and catalytic selectivity for synthesis of saturated aliphatic primary amine, and is wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a carbon-based cobalt catalyst co-doped with nitrogen and phosphorus, a preparation method and a synthesis method of saturated aliphatic primary amine. Background technique [0002] Amines are an important class of fine chemical intermediates, widely used in medicine, pesticides, dyes, polymer materials and other fields. Selective reduction of nitrile compounds is an important method for the preparation of primary amines. [0003] The corresponding products of hydrogenation of nitriles are primary amines, secondary amines and tertiary amines. In order to selectively obtain primary amines, it is necessary to maintain a certain alkalinity in the reaction system to suppress the formation of secondary and tertiary amines. The traditional method is to add a strong base such as sodium hydroxide into the reaction system, but a large amount of alkaline waste will be gene...

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Problems solved by technology

For example, CN111195523A and CN109456207A all adopt the above-mentioned process to prepare primary amine, and the yield reaches more than 90%, but these two kinds of methods all face the processing problem of tail gas containing ammonia

[0004] In addition, WO2007104663 uses a solid alkaline hydrogenation catalyst to achieve the selective reduction of nitriles to primary amines under ammonia-free conditions, preferably at 80-130°C and 10-65 bar, the yield can reach more than 98%, but the catalyst Poor stability, under continuous operating conditions, activity and selectivity continue to decline

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