对甲醇羰化气相合成碳酸二甲酯 ( DMC)负载型铜基催化剂进行了活性评价 ,并以 X射线衍射和光电子能谱对催化剂反应前后的物相进行分析鉴定。结果表明 ,催化剂反应前 ,主要物相为 Cu2 O、Cu0、Cu Cl2 · 3Cu( OH) 2 ,反应后 ,主要物相为 Cu O、Cu2 O、Cu Cl2 · 3Cu( OH) 2 。研究认为铜基催化剂上气相甲醇羰化合成 DMC反应的催化活性位是 Cu O和 Cu2 O,反应是基于 Cu2 +和 Cu+的氧化还原催化循环 The activity of the supported copper-based catalysts for the synthesis of dimethyl carbonate (DMC) in methanol by carbonylation was evaluated. The phases of the catalyst before and after the reaction were identified by X-ray diffraction and photoelectron spectroscopy. The results show that the main phases are Cu 2 O, CuO and CuCl 2. 3Cu (OH) 2 before the reaction. The main phases are CuO, Cu 2 O and CuCl 2. 3Cu (OH) 2 after the reaction. It is considered that the catalytic active sites for the DMC reaction of vapor phase methanol carbonylation on copper-based catalysts are CuO and Cu2O, and the reaction is based on the redox catalysis cycle of Cu2 + and Cu +