A kind of preparation method and application of high hydrogenation selectivity PT-based alloy/mofs catalyst

Abstract

The invention relates to the technical field of molecular biology, in particular to a preparation method and application of a highly hydrogenation-selective Pt-based alloy / MOFs catalyst. The invention prepares a Pt alloy in which Pt alloy particles are evenly loaded on the surface of MOFs by a one-step solvothermal method. / MOFs structure, the preparation method of the present invention is simple, and the reaction environment is not harsh and does not require a special atmosphere, the obtained product has a unique structure, the metal particle size is small, the distribution is uniform, and it is not easy to lose, and it will not affect the catalytic activity of the metal. In terms of catalytic performance, the Pt alloy / MOFs catalyst prepared by the present invention can catalytically hydrogenate cinnamaldehyde at normal temperature and pressure, and has excellent performance. In addition, the catalyst can also catalyze the selective hydrogenation of 3-nitrostyrene, which proves that the catalyst of the invention has a wide range of applications.

Description

technical field [0001] The invention relates to the technical field of molecular biology, in particular to a preparation method and application of a Pt-based alloy / MOFs catalyst with high hydrogenation selectivity. Background technique [0002] In recent years, the selective hydrogenation of α, β-unsaturated aldehydes to obtain a relatively single product has become a research hotspot, because whether it is a C=C double bond hydrogenation product or a C=O double bond hydrogenation product, it can be used Used in reaction intermediates, perfume, food processing and other fields. Since C=O double bonds are thermodynamically more stable than C=C double bonds, highly selective hydrogenation of C=O bonds to unsaturated alcohols is still a challenge. In addition, there are also some selective hydrogenation reactions such as the selective generation of 3-aminostyrene from 3-nitrostyrene, which are also very important but difficult to achieve high selectivity. Pt-based noble metal...

AI Technical Summary

Problems solved by technology

Studies have shown that when PtFe nanowires are used in the selective hydrogenation of α, β-unsaturated aldehydes, they have good catalytic activity and C=O double bond hydrogenation selectivity, which is better than that of pure Pt nanowires. The morphology of PtFe nanowires will be destroyed after the cyclic reaction, leading to a gradual decline in its catalytic performance

[0005] At present, although considerable research progress has been made on selective hydrogenation catalysts, the existing selective hydrogenation catalysts still have problems such as many and complicated synthesis steps in the preparation method, and the final catalyst still needs to be prepared in a relatively Catalytic hydrogenation can only be carried out under severe reaction conditions

At the same time, most of the existing selective hydrogenation catalysts synthesize noble metal or alloy nanoparticles first, and then load the particles on the carrier by mechanical stirring. Although the catalysts obtained in this way have good catalytic activity and hydrogenation selectivity, they are Since the metal particles are exposed outside, and there is only physical adsorption between the metal and the carrier, there is no interaction, it is easy to fall, agglomerate or deform during the catalysis process, and its own circulation is difficult to be guaranteed.

In addition, some non-noble metal salts are difficult to reduce, requiring severe reaction temperature or special gas atmosphere (such as CO, H 2 etc.) can be reduced, which severely limits its large-scale synthesis

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