Preparation method of Co@ZCuC/Al2O3 catalyst for high-selectivity preparation of isobutyraldehyde

Abstract

The invention belongs to the technical field of catalysis, and particularly relates to a preparation method of a Co@CuC / Al2O3 catalyst for high-selectivity preparation of isobutyraldehyde. The preparation method comprises the following steps: preparing a double-active-center catalyst precursor by using a co-precipitation method, then carrying out methane treatment in a plasma reactor to generate stable active metal and carbide, and in a plasma environment, generating stable carbocations and hydrogen ions from propylene at a metal active center. Copper carbide can maintain the retention time of a secondary carbon ion intermediate, CO is adsorbed on an active center, carbonyl carbon is activated to be combined with secondary carbon ions, and finally isobutyraldehyde is generated with dissociated hydrogen on the copper carbide and cobalt. The selectivity of propylene hydroformylation can be higher. The catalyst prepared by the method is low in cost, high in activity, good in catalyst stability, low in reaction temperature, low in pressure and high in isobutyraldehyde selectivity, and has a very good industrial prospect.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a Co@CuC / Al for highly selective preparation of isobutyraldehyde 2 o 3 Catalyst preparation method. Background technique [0002] In 1938, German scientist Otto Roelen discovered for the first time that the aldehyde groups generated by the hydroformylation reaction could be further converted into imines, amines, hemiacetals, acetals, aminals, carboxyl groups, hydroxyl groups, etc. The purpose of the existing propylene hydroformylation reaction is to prepare n-butyraldehyde. In order to improve the selectivity of n-butyraldehyde, the rhodium carbonyl-phosphine ligand is used as the active component of the homogeneous catalyst, and the selectivity of n-butyraldehyde is adjusted through the spatial structure of the phosphine ligand. Although the activity and selectivity of this catalyst are high, the price of rhodium metal is expensive and the production cost is very high. And...

AI Technical Summary

Problems solved by technology

Although the catalyst has high activity and selectivity, rhodium metal is expensive and the production cost is high

And the phosphine ligand is highly toxic and harmful to the environment

And the catalyst is a homogeneous catalyst, the product generated is difficult to separate from the catalyst, and the recovery rate of precious metal rhodium is not high, which is unfavorable for engineering application

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