Preparation method and application of Pt-based alloy/MOFs catalyst with high hydrogenation selectivity

Abstract

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. A Pt alloy / MOFs structure in which Pt alloy particles are uniformly loaded on the surface of MOFs is prepared through a one-step solvothermal method; the preparation method is simple, the reaction environment is not harsh, and no special atmosphere is needed. The obtained product is unique in structure, metal particles are small in size, uniform in distribution and not prone to loss, and meanwhile the catalytic activity of metal cannot be affected. In the aspect of catalytic performance, the Pt alloy / MOFs catalyst prepared by the invention can be used for catalytic hydrogenation of cinnamyl aldehyde at normal temperature and normal pressure, and is excellent in performance. In addition, the catalyst can also catalyze selective hydrogenation of 3-nitrostyrene, which proves that the catalyst provided by the invention has wide application.

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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