HYDROCHLORINATION OF ACETYLENE CATALYZED BY COPPER PYRIDINIUM CHLORIDE SUPPORTED ON ACTIVATED CARBON

Abstract

Abstract: The copper pyridinium chloride catalyst supported on activated carbon was prepared by the impregnation method. The catalytic performance of the catalyst in the acetylene hydrochlorination reaction was tested and compared with that of the catalyst of copper chloride supported on activated carbon. Under the conditions of reaction temperature of 330 ℃, the volume space velocity of C₂H₂ of 100 h^-1, the molar ratio of HCl to C₂H₂of 1.05, and the content of copper pyridinium chloride of 15%, the conversion rate of acetylene reached 64%, and the selectivity of vinyl chloride was more than 95%. By means of SEM, XRD, XPS, TG, BET and TPD, It was found that the strong adsorption of hydrogen chloride and the good stability of Cu²⁺ were the key factors for the high activity of the catalyst, and the main reason for the deactivation of the copper pyridinium chloride catalyst was the deposition of carbon on its surface, the main reasons for deactivation of copper chloride catalyst were coke deposition and Cu²⁺ reduction. The mechanism of acetylene hydrochlorination catalyzed by copper pyridinium chloride was studied by using molecular simulation software.

Key words: acetylene hydrochlorination, catalyst, copper pyridinium chloride, vinyl chloride, activated carbon

References

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