Supported yolk-eggshell structure nano-catalyst and preparation method thereof

Abstract

The invention provides a supported yolk-eggshell structure nano-catalyst. The supported yolk-eggshell structure nano-catalyst comprises a carrier and an active component; the carrier is a metal organic framework; the active component is double-transition metal nanoparticles with a plasma resonance effect; and the double-transition metal nanoparticles are embedded into the carrier, so that the active component and the carrier form a yolk-eggshell structure. Compared with like catalysts in the prior art, the catalyst provided by the invention absorbs visible light and converts light energy intoheat energy by utilizing the plasma resonance effect of the supported double-transition metal nanoparticles, so that the reaction condition of p-nitrostyrolene hydrogenation is converted into normal temperature and normal pressure; and the unique yolk-eggshell structure of the catalyst makes more active sites exposed, and a cavity between the yolk and the eggshell can enrich a reaction substrate and increase the contact area between the substrate and the active site, so that the catalyst shows efficient catalytic activity and reaction selectivity in the hydrogenation reaction of p-nitrostyrolene, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanometer catalysts, and in particular relates to a loaded egg yolk-eggshell structure nanometer catalyst and a preparation method thereof. Background technique [0002] The selective hydrogenation of unsaturated nitrobenzene is a very important chemical reaction in industry. Functional aniline, one of the products obtained, is an important industrial intermediate. It is used in pharmaceuticals, polymers, herbicides, dyes, pigments and other chemical There are a wide range of applications in the field. However, since most transition metal catalysts cannot distinguish between different functional groups, it is very difficult to reduce only nitro groups in the presence of functional groups such as C=C and C=O. Moreover, some traditional tin, zinc and iron-based catalysts will produce some harmful chemical wastes during the reaction process, which is not conducive to the sustainable development of the envir...

AI Technical Summary

Problems solved by technology

However, it is very difficult to reduce only the nitro group in the presence of functional groups such as C=C and C=O because most transition metal catalysts cannot distinguish between different functional groups.

Moreover, some traditional tin, zinc and iron-based catalysts will produce some harmful chemical wastes during the reaction process, which is not conducive to the sustainable development of the environment

In addition, this reaction usually uses hydrogen as the hydrogen source, which requires high pressure and heating to occur. The reaction time is long and the reaction conditions are relatively harsh. Therefore, the synthesis of green, mild, efficient and chemoselective catalysts has always been a challenge. One of the hot spots of research at home and abroad

Images