Eggshell type catalyst for selective hydrogenation reaction as well as preparation method and application thereof

Abstract

The invention discloses an eggshell type catalyst for a selective hydrogenation reaction. The eggshell type catalyst is composed of an active component, a reducing agent, an auxiliary agent and a carrier, wherein the active component is Pd, the reducing agent is Na or K; the auxiliary agent is La, Ce, Cu, Cr or Ni; the carrier is Al2O3; the active component Pd is distributed in an eggshell shape on the surface of the carrier Al2O3; the thickness of a shell layer is 0.02-0.1mm; the catalyst is composed of 0.05-0.5% of Pd, 0.1-1% of the reducing agent and 0.2-2.5% of the auxiliary agent on the basis of the mass of the carrier. The preparation method is simple and has good controllability; the loading amount of noble metals is low and industrial production is easy to realize; the prepared eggshell type catalyst can represent high activity and selectivity under the conditions of low reaction temperature and pressure; the eggshell type catalyst has good stability and also has the advantages of simple and easy operation method, high noble metal utilization rate, low cost, low environmental pollution and the like.

Description

technical field [0001] The invention relates to the field of catalysts and their preparation, in particular to an eggshell catalyst for selective hydrogenation of C=C bonds in α, β-unsaturated carbonyl compounds, a preparation method and applications thereof. Background technique [0002] α, β-unsaturated carbonyl compounds (aldehydes, ketones, carboxylic acids and their derivatives) are important chemical raw materials and intermediates. The saturated carbonyl compounds obtained by hydrogenation of C=C bonds are also used in the production of medicines, hormones, and spices. , food additives, agricultural chemical products and other important substances. For example, dimethyl succinate, the product of C=C double bond hydrogenation in dimethyl maleate (DMM), is used in the synthesis of spices, light stabilizers, high-grade coatings, fungicides, and pharmaceutical intermediates. The hydrogenated phenylpropanal, the hydrogenation product of the C=C double bond in cinnamaldehy...

AI Technical Summary

Problems solved by technology

[0009] Although the above-mentioned noble metal catalysts Pd, Rh, Ru, etc. have shown good catalytic activity and selectivity for the selective hydrogenation of C=C bonds in α, β-unsaturated carbonyl compounds, but the cost of the catalyst is expensive, the preparation process is complicated, and the selection of the target product is difficult. Sex needs to be further improved

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