乙炔与1，2-二氯乙烷合成氯乙烯无汞催化剂的制备与性能

采用等体积浸渍法制备出不同氮化合物改性、金属氯化物负载的系列活性炭催化剂，在固定床反应器中考察了催化剂对乙炔与1，2-二氯乙烷耦合反应的催化效果，考察了优选催化剂 80 h 运行稳定性，并利用扫描电子显微镜（SEM）和 X 射线光电子能谱（XPS）仪分析了催化剂的失活原因。结果表明:咪唑改性椰壳活性炭催化剂可有效催化乙炔和1， 2-二氯乙烷发生耦合反应生成氯乙烯；在反应 80 h 过程中，1， 2-二氯乙烷的转化率和氯乙烯的选择性随反应时间变化不大，但乙炔转化率降低了 21 个百分点；表面积炭及活性位点吡啶氮摩尔分数降低是催化剂失活的主要原因。

Preparation and performance of mercury-free catalyst for synthesis of vinyl chloride from acetylene and 1，2-dichloroethane

The equal volume impregnation method was adopted to prepare a series of activated carbon catalysts modified with different nitrogen compounds and loaded with metal chlorides. The catalytic activity of the catalyst for the coupling reaction of acetylene and 1，2-dichloroethane was investigated in a fixed bed reactor and the operational stability of the optimal catalyst was investigated in 80 h. Scanning electron microscopy （SEM）and X-ray photoelectron spectroscopy（XPS） were used to analyze the cause of catalyst deactivation. The results indicated that imidazole modified coconut shell activated carbon catalyst could effectively catalyze the coupling reaction of acetylene and 1，2-dichloroethane to produce vinyl chloride. During the reaction process in 80 h， the conversion rate of 1，2-dichloroethane and the selectivity of vinyl chloride did not change significantly with reaction time， but the conversion rate of acetylene decreased by 21 percentage points. The production of surface carbon and the molar fraction loss of pyridine nitrogen were the main reasons for catalyst deactivation.