Heterogeneous catalyst for selective hydrogenation reaction of aryl nitro-compound and application of heterogeneous catalyst

Abstract

The invention discloses a heterogeneous catalyst for selective hydrogenation reaction of an aryl nitro-compound. The heterogeneous catalyst consists of 10-90 weight percent of base metal particles and 10-90 weight percent of nitrogen-doped carbon nano tubes, wherein the nitrogen content in the nitrogen-doped carbon nano tubes is 0.01-20.0 weight percent. The preparation method comprises the following steps: by taking a carbohydrate as a raw material, uniformly mixing the carbohydrate with an artificial template agent in the presence of base metal salts, preserving the temperature of 400-650 DEG C for 0.5-2 hours in an inert atmosphere, raising the temperature to 700-1200 DEG C, and calcining for 0.5-2 hours, thereby obtaining the heterogeneous catalyst. The heterogeneous catalyst containing base metals is generated in situ through a specific method, is stable to air and water heat, is applied to the selective hydrogenation reaction of the aryl nitro-compound and has excellent catalytic activity and selectivity.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a heterogeneous catalyst for selective hydrogenation of aromatic nitro compounds and its application. Background technique [0002] Functionalized amine-based compounds (such as aniline, methylaniline, phenol-aniline, halogenated aniline, cyanoaniline, amidoaniline, etc.) are important industrial raw materials, mainly used in the manufacture of important intermediates such as dyes, medicines, spices, and pesticides. body. Due to the atom economy and environmental friendliness, the selective catalytic hydrogenation of aromatic nitro compounds is a direct and efficient method for the preparation, and the key of this method is to control the selectivity of catalytic hydrogenation. [0003] The research on the selective hydrogenation of aromatic nitro compounds to functional amino compounds has always been a hot topic. Literature (Science, 2006, 313, 332-334) introduced a kind o...

AI Technical Summary

Problems solved by technology

Although metal catalysts supported on carbon tubes are widely used, these catalysts also have inherent weaknesses

Such as the catalyst is easily deactivated in the air, and the selectivity is not high in some selective reactions. As a catalyst, it is often necessary to add a co-catalyst (Catal. Lett. 1977, 49, 219-221), etc. These problems limit the application of this type of catalyst

Images