Kenone selective hydrogenation catalyst, and preparation method and application thereof

Abstract

The present invention provides a ketene selective hydrogenation catalyst, and a preparation method and application thereof. The catalyst comprises an alumina carrier and active components, and the active components comprise 0.2-1 wt% of palladium, 0.5-2 wt% of manganese nitride (in terms of manganese element), and 0.5-6 wt% of hydride of at least one of terbium, cerium, yttrium and lutetium (in terms of metal element) based on the mass of the carrier. The catalyst is low in palladium content, is used for preparing corresponding saturated ketones through selective hydrogenation of ketene, has higher activity, and can inhibit ketene polymerization and reduce side reaction selectivity.

Description

technical field [0001] The invention belongs to the technical field of enone catalytic hydrogenation, and relates to a catalyst for the selective hydrogenation of enone and its preparation method and application, specifically, a catalyst for the selective hydrogenation of enone to the corresponding saturated ketone and its preparation method and apply. Background technique [0002] At present, palladium-based catalysts are commonly used in industry to promote the selective hydrogenation of enones. This is because the transition metal palladium has a good activation performance for hydrogen, and the surface of the transition metal Pd can be passivated to inhibit the reduction of the ketone group. Thereby improving the reaction selectivity. The Lindlar catalyst mainly used in the selective hydrogenation reaction of enone in industrial production is the strategy of surface passivation, and the Pd / C catalyst is modified with additives such as lead and bismuth, but the Lindlar c...

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Problems solved by technology

[0004] CN101518734A discloses a catalyst for catalytic combustion of low calorific value gas, the catalyst contains 60-80% γ-Al 2 o 3 , 19.9-39.5% oxides of La or Mn or their combination, and the remaining components are Pd, which improves the high-temperature activity of the catalyst, but the catalyst has a high metal content, and the metal promoter in the oxidation state cannot improve the hydrogenation selectivity of the catalyst. It is tested that the catalyst is used in the hydrogenation of ketene, the substrate conversion rate is low, and the ketone group is also reduced during the reaction, the ketene polymer exceeds 5%, and the product selectivity is low

The catalyst components are complex, the preparation process is cumbersome, and it is difficult to achieve large-scale production

[0006] CN110075887B discloses a palladium-supported catalyst for catalytic combustion of methanol, which mainly solves the problems of high noble metal content and easy deactivation of catalysts prepared in the prior art

Prepared by impregnation and precipitation method, including active component Pd, additives such as manganese nitrate, sodium dihydrogen phosphate and activated alumina carrier, the catalyst has high activity and selectivity in the catalytic combustion of methanol, and the precious metal is not easy to agglomerate and lose active, but the catalyst has a low conversion rate and poor selectivity of the hydrogenation substrate in the enone hydrogenation reaction, and the ketone group is also reduced during the reaction

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