Supported cobalt-nitrogen doped carbon catalyst as well as preparation method and application thereof

Abstract

The invention discloses a supported cobalt-nitrogen doped carbon catalyst as well as a preparation method and an application thereof. The catalyst comprises a carrier and cobalt-nitrogen doped carbon,wherein the carrier is carbon powder or Ce-Al2O3, the cobalt-nitrogen doped carbon is produced from cobalt phthalocyanine by high-temperature in-situ pyrolysis in a nitrogen atmosphere, and the massof the cobalt-nitrogen doped carbon is 1%-20% of that of the carrier. The preparation method of the catalyst comprises the steps of placing cobalt phthalocyanine, the carrier and aids in a ball mill for full ball milling and then performing roasting at 400-1000 DEG C for 1-10 h in the nitrogen atmosphere. The catalyst is applied to a reaction for preparing aromatic amine through catalytic reduction of aromatic nitro-compounds and has higher catalytic activity, product selectivity and substrate universality, no solvent is used in the preparation process of the catalyst, and the preparation method is simple, environmentally friendly and pollution-free and has good industrial application prospects.

Description

technical field [0001] The invention relates to a supported cobalt-nitrogen doped carbon catalyst and its preparation method and application, belonging to the field of catalysts. Background technique [0002] Aromatic amine compounds are a very important class of organic chemical raw materials, mainly used in explosives, plastics, dyes, rubber, pesticides, paints and spices and other fields. There are many methods for synthesizing aromatic amines. Among them, the most common and economical route is to prepare aromatic amines by means of hydrogenation and reduction of aromatic nitro compounds as raw materials. This process is simple and the raw materials are easy to obtain, so it has been widely studied. Through the continuous efforts of scientists, the catalysts for the catalytic reduction of aromatic nitro compounds have gradually changed from heavily polluted iron powder to relatively expensive noble metals. Further, the cheap transition metal Co is currently the majority,...

AI Technical Summary

Problems solved by technology

[0004] Although the catalyst prepared by the above-mentioned method is effective in practical application, it is still unsatisfactory, and there are still at least the following problems: (1) the catalyst preparation process is complicated, usually at least three steps are required to prepare the catalyst, and more importantly The preparation process needs to use a large amount of organic solvents, which can easily cause serious environmental pollution; (2) Both methods of preparing catalysts need to use HF aqueous solution to further treat the catalyst, and HF aqueous solution is a highly corrosive and violent Toxic reagents, there are great safety hazards in the use process, not only that, the waste acid produced is also easy to cause environmental pollution; (3) In the process of using HF aqueous solution to treat the catalyst, not only the carrier SiO 2 will be removed, and part of the oxide of metal Co will also be lost. Therefore, the preparation yield of the catalyst is low and the preparation cost is high

[0005] The above method has the problems of complex process, serious environmental pollution, low catalyst preparation yield and high cost.

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