GC/ MS、 TPD和 XPS方法 ,研究了三氯乙烯的气相光催化降解反应 ,检测到新的中间体乙二酰氯(Cl COCOCl) .对产物分布的分析表明 ,水蒸汽的存在能显著抑制含氯副产物的生成 ,改变反应产物的分布 .使用过的催化剂的 XPS谱图显示 ,催化剂表面存在含氯副产物 .反应副产物在催化剂表面的积累是导致催化剂失活的主要原因 GC / MS, TPD and XPS methods were used to study the gas phase photocatalytic degradation of trichlorethylene, and the new intermediate Cl 2 COCOCl was detected.The analysis of product distribution showed that the presence of water vapor could significantly inhibit the degradation of The formation of chlorine by-products changes the distribution of the reaction products.The XPS spectra of the used catalysts show that there are chlorine by-products on the surface of the catalyst.The accumulation of reaction by-products on the surface of the catalyst is the main reason for the deactivation of the catalyst