A kind of preparation method of the anti-high-temperature deactivation gold-based catalyst used for synthesizing vinyl chloride

Abstract

The invention discloses a preparation method of a high-temperature inactivation resistant load type gold catalyst for synthesizing chlorethylene in acetylene hydrochlorination. The catalyst takes active carbon as a carrier, takes aminothiopropionic acid, cystine, methionine and thiocarbamide as active carbon organic surface modifiers and takes auric chloride as an activity center. During the reaction of synthesizing chlorethylene in acetylene hydrochlorination, the active carbon surface modified load type gold catalyst has a high-temperature inactivation resistant performance better than that of an unmodified active carbon load type gold catalyst.

Description

technical field [0001] The invention proposes a preparation method for enhancing the anti-high temperature deactivation performance of an activated carbon-loaded gold trichloride catalyst using cysteine, cystine, methionine and thiourea as active carbon organic surface modifiers. The catalyst uses gold trichloride as an active component and activated carbon modified by an organic surface modifier as a carrier. The preparation steps of the catalyst include two steps of surface modification of activated carbon and loading of active components. The catalyst exhibits high resistance to high temperature deactivation in the reaction of acetylene hydrochlorination to synthesize vinyl chloride. Background technique [0002] Polyvinyl chloride (PVC), as the third largest plastic product, is widely used all over the world. Its demand is also increasing year by year. As far as China is concerned, the total output of PVC has been increasing at a growth rate of no less than 20% since ...

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Problems solved by technology

However, there is still a problem in their research: catalysts with Au as the active center will have different deactivation rates at different temperatures (the deactivation rate is the reduction rate of acetylene conversion in the acetylene hydrochlorination reaction), And with the increase of reaction temperature, the deactivation rate has a significant increase

[0005] The gap in the prior art is that activated carbon is widely used as a catalyst carrier in industry, and the research on organic modifiers for its surface modification is less; at present, most of the modified substances for carbon materials use N-containing groups. Substances containing other groups are used less

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