Carbon tetrachloride dechlorination catalyst

Abstract

The invention provides a carbon tetrachloride dechlorination catalyst. According to the catalyst, Al2O3 modified activated carbon is taken as a carrier, Pt and metal M are taken as active components,and the metal M is any one or at least two of Cr, Mn, Co and Ba. By carrying out hydrodechlorination on carbon tetrachloride under the effect of the catalyst, seven products including methane, methanechloride, methane dichloride, methane trichloride, ethylene tetrachloride, acetylene tetrachloride and hexachloroethane can be generated; by adjusting the structure of the catalyst and the process ofcatalytic reaction, the relative contents of the seven products can be changed; the catalyst is good in stability and long in service life.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a carbon tetrachloride dechlorination catalyst. Background technique [0002] Carbon tetrachloride is a kind of methane chloride, which is mainly used in the production of freon refrigerants, but it has serious damage to the ozone layer. According to the requirements of the Montreal Protocol, freon refrigerants should be phased out and replaced. At present, the domestic annual production of carbon tetrachloride is at least 70,000 tons, while the market demand is less than 30,000 tons. Therefore, it is of great significance to find ways to reduce the production of carbon tetrachloride and increase the destination of carbon tetrachloride. [0003] Carbon tetrachloride is a product of overchlorination during the reaction of methane and chlorine to produce methyl chloride. Through technical improvement, the output of carbon tetrachloride may be reduced, but by-products are still un...

AI Technical Summary

Problems solved by technology

[0003] Carbon tetrachloride is a product of overchlorination during the reaction of methane and chlorine to produce chloromethane products. Through technical improvement, the production of carbon tetrachloride may be reduced, but by-products are still unavoidable

[0007] The technology of carbon tetrachloride selective dechlorination to produce chloroform has industrialized application, and the industrial application of the technology of carbon tetrachloride selective hydrogenation to make other products has not been reported yet, no matter which carbon tetrachloride selective dechlorination is prepared For a product, no matter how good the technology of catalyst and catalytic process is, it is impossible to achieve 100% conversion rate or selectivity, and it is even more difficult to scale up to industrial production, resulting in a certain degree of waste and pollution

For example, carbon tetrachloride is used as chloroform at present, and the selectivity is up to 90%. Carbon tetrachloride cannot be completely converted. Due to the many types of by-products and the small amount, if the by-products are collected for separation and purification, the cost is high, and the gain outweighs the gain. If you do not collect cause waste and pollution

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