Ultralow-content noble metal composite catalyst for acetylene hydrochlorination reaction and preparation method thereof

Abstract

The invention discloses an ultralow-content noble metal composite catalyst for acetylene hydrochlorination reaction and a preparation method thereof, wherein the catalyst is obtained by loading a noble metal-amino acid complex and a co-catalytic component on acid-treated activated carbon, wherein amino acids are cysteine, glutamine, asparaginate and the like, the co-catalytic component is copper chloride, cobalt chloride, cerium chloride, bismuth chloride, cesium chloride and the like; and the catalyst comprises, by mass, 0.05-0.25% of a noble metal component and 0.06-0.90% of the co-catalyticcomponent. According to the preparation method, the noble metal-amino acid complex and the co-catalytic component are sequentially impregnated on the acid-treated activated carbon, the catalyst is obtained by freeze-drying, the preparation process is simple and pollution-free, the method is suitable for industrial scale production, the catalyst has excellent catalytic activity, selectivity and long service life in the acetylene hydrochlorination reaction, the acetylene conversion rate can be kept above 98.5% in a long-time operation; the chloroethylene selectivity is more than 99%.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to an ultra-low-content noble metal composite catalyst for acetylene hydrochlorination and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is the second most versatile synthetic resin in the world. In recent years, the process of producing vinyl chloride monomer by the calcium carbide method (acetylene method) has developed rapidly in my country and has become the mainstream of the PVC industry. However, the present acetylene method to prepare vinyl chloride basically adopts mercuric chloride as the active component of the catalyst. The activity and selectivity of the catalyst are relatively high, and the price is relatively low, but there is a biggest problem of poor thermal stability. In the process of use, highly toxic mercury chloride will continue to be volatilized, which will cause serious pollution to the environment while th...

AI Technical Summary

Problems solved by technology

On the whole, although noble metal catalysts are used in acetylene hydrochlorination to prepare vinyl chloride, although they have good selectivity and activity, their stability is poor. The development of industrially applied acetylene hydrochlorination noble metal catalysts can replace the currently mature mercury-containing catalysts. There are still many technical problems that need to be solved

The key technical difficulty lies in how to reduce the cost of the catalyst and solve the problem of rapid catalyst deactivation during the reaction process

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