2,5-Dimethylpyrazine(DMP)and copper chloride are both loaded onto activated carbon through using impregnation method,and used as the catalyst in the acetylene hydrochlorination reaction.The catalytic performance of the catalyst is tested at 140℃,with an acetylene volume space velocity of 50 h-1 and a hydrogen chloride to acetylene molar ratio of 1.05∶1.The catalyst is characterized by means of ICP-AES,infrared spectroscopy,XRD,and TG methods.The results show that the conversion rate of acetylene achieves 74.02％and the selectivity of vinyl chloride reaches 97.19％over the catalyst with an apparent Cu content of 17％after adding 2,5-dimethylpyrazine.The improvement of the activity of copper-based catalyst by 2,5-dimethylpyrazine can be attributed to that 2,5-dimethylpyrazine can reduce the aggregation of copper species and improve the dispersity of active components,which can generate Cu-N coordination chemistry bond,anchoring copper species to make it stable.2,5-Dimethylpyrazine can suppress carbon deposition on the surface of the catalyst and reduce deactivation caused by carbon deposition.
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