A kind of heterogeneous catalyst for the selective hydrogenation reaction of alkynes and its application

Abstract

The invention discloses a heterogeneous catalyst for the selective hydrogenation reaction of acetylenic compounds and its application. The heterogeneous catalyst consists of 1-10% noble metal particles and 9-90% titanium oxidation material and 9-90% porous carbon. Compared with the general commercial activated carbon-supported Pd catalyst or titanium dioxide-supported Pd catalyst, the heterogeneous catalyst prepared by the present invention has obvious synergistic effect when used to catalyze the selective hydrogenation reaction of alkyne compounds to prepare olefin compounds. The introduction of porous carbon not only It can promote the diffusion of the substrate, and at the same time further regulate the interaction between the noble metal particles and the titanium oxide, enrich the charge of the noble metal particles, thereby improving the catalytic activity and selectivity of the hydrogenation of alkyne compounds. When the catalyst of the invention is used to catalyze the hydrogenation reaction of phenylacetylene to prepare styrene, the selectivity of styrene is greater than 95%, and the conversion rate of phenylacetylene is 100%.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a heterogeneous catalyst for selective hydrogenation of acetylenic compounds and an application thereof. Background technique [0002] Alkenes synthesized by selective hydrogenation of alkynes constitute the backbone of many natural products and drugs, and are the type of reactions often involved in the synthesis of key pharmaceutical intermediates. Biological and pharmaceutical active molecules such as β-carotene, vitamin E, pheromone, cucurbitacin, resveratrol, polyunsaturated fatty acids, and polyene antifungal drugs are all involved in the synthesis of carbon-carbon double bonds. It plays an important role in reproductive function, prevention of cardiovascular and cerebrovascular diseases, inhibition of inflammation, and anti-tumor. Therefore, the realization of half-hydrogenation of alkynes has important application value and significance. [0003] Due to the atom economy and envi...

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Problems solved by technology

Activated carbon-supported Pd catalyst has certain catalytic activity for alkyne compounds, but the catalytic selectivity needs to be further improved

The strong interaction between titanium dioxide and metal Pd makes it exhibit high catalytic activity in the selective hydrogenation of alkyne compounds, but it still has inherent weaknesses, such as the catalyst is easily deactivated in the air, and the reaction selectivity is not good. High, as a catalyst often need to add co-catalyst or multi-step treatment (Selectivity enhancement in acetylene hydrogenation over diphenyl sulphide-modified Pd / TiO2catalysts.J.Catal.2011,281,231), etc. These problems limit the application of this type of catalyst

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