Catalyst for synthesizing isopropenyl acetate and preparation method thereof

Abstract

The invention relates to a catalyst for synthesizing isopropenyl acetate and a preparation method thereof, which mainly solve the problems that in the prior art, the Pd-Cu alloy crystal grains are too small, so the initial activity of the catalyst is too high, the catalyst is in a lower reaction temperature for a long time, the induction period of the catalyst is prolonged, and the yield of the isopropenyl acetate is reduced. The catalyst and the preparation method have the technical scheme that Pd (palladium), Cu (copper) and alkali metal acetates are loaded on silicon dioxide, aluminum oxide or a mixture of the silicon dioxide and the aluminum oxide, and the Pd-Cu alloy crystal grain size is 5 to 15nm. The problems are perfectly solved, and the catalyst and the preparation method can be used for industrial production of isopropenyl acetate catalysts.

Description

technical field [0001] The invention relates to a catalyst for synthesizing propylene acetate by gas-phase reaction of propylene, acetic acid and oxygen-containing gas and a preparation method thereof. Background technique [0002] The production of propylene acetate from the reaction of propylene, acetic acid and an oxygen-containing gas under gas phase conditions in the presence of a catalyst comprising palladium, gold and an alkali metal acetate is a well known process. The catalyst used is generally a supported catalyst, and the catalyst is made of SiO 2 、Al 2 o 3 or SiO 2 with Al 2 o 3 The mixture is a carrier, and the loaded active components are metal palladium, metal copper and alkali metal acetate. Catalysts are usually prepared by impregnation. The preparation process mainly includes: impregnating the carrier with a solution containing palladium and copper compounds to make a catalyst precursor; impregnating the catalyst precursor with an alkaline solution to...

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is that the Pd-Cu alloy crystal grains existing in the prior art are too small to cause the initial activity of the catalyst to be too high, so that the catalyst output loss is caused due to a long induction period during the start-up of the catalyst. Provide a new catalyst for the gas phase reaction of propylene, acetic acid and oxygen-containing gas to synthesize propylene acetate. The catalyst has the advantages of effectively inhibiting the initial activity of the catalyst, shortening the acclimation period of the catalyst, and improving production efficiency

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