Selectivity liquid phase hydrogenation catalyst and preparation method and use thereof

Abstract

The invention relates to a catalyst, which is applicable to the selective liquid phase catalytic hydrogenation of Alpha, Beta-unsaturated carbonyl compounds to make corresponding unsaturated carbonyl compounds or unsaturated alcohol, being especially suitable for the selective hydrogenation of citral to make citronellal and / or citronellol. The catalyst of the invention is a metal component loaded on a structured composite nano carbon fiber, wherein, the metal component is selected from one of or a plurality of nickel, ruthenium, rhodium, palladium and platinum. The components of the catalyst are: 1) structured substrate, such as metal foam, honeycomb ceramic, carbon felt and ceramic fiber; 2) nano material coating, such as nano carbon fiber; 3) metal active component, such as nickel, ruthenium, rhodium, palladium and / or platinum. The invention effectively avoids deep reaction, thus enhancing the target product selectivity. The catalyst is prefabricated into a variety of shapes and installed in a reactor, so that the catalyst, the liquid phase reactants and the solution are easy to be separated, thus meanwhile reducing the loss of the catalyst.

Description

technical field [0001] The present invention relates to a catalyst. The catalyst is suitable for selective liquid-phase catalytic hydrogenation of α, β-unsaturated carbonyl compounds to produce corresponding saturated carbonyl compounds or unsaturated alcohols. It is especially suitable for the selective hydrogenation of citral to produce citronellal and / or citronellol. Background technique [0002] The rate of heterogeneous catalytic reactions, especially gas-solid-liquid three-phase catalytic reactions, is usually limited by mass transfer. The result is a decrease in the overall package reaction rate. Mass transfer limitations can also affect target product selectivity in complex reactions. Especially for those complex reactions whose target products are the intermediate products of a series of continuous reactions, such as the selective hydrogenation of citral to produce citronellal and / or citronellol, mass transfer limitations lead to a significant decrease in target ...

AI Technical Summary

Problems solved by technology

The disadvantages of these methods are: it is difficult to separate the catalyst from the reaction product, and the loss of the catalyst is large.

If a fixed bed reactor is used, the internal diffusion will become the bottleneck affecting the catalytic activity and selectivity, and the bed pressure drop will be too large

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