中文摘要：

以Ce0.4Zr0.6O2作催化剂,二氧化碳与甲醇为反应物,在超临界条件下直接合成碳酸二甲酯。通过正交试验及单因素实验方法,对反应温度、反应压力以及反应时间等反应条件进行了优化。结果表明,碳酸二甲酯的最佳合成条件：当催化剂铈锆固溶体（Ce0.4Zr0.6O2）与甲醇用量比气相色谱-质谱联用为1∶50（体积比）时,反应温度为180℃,反应压力为9.5MPa,反应时间为8h。在此最佳条件下,用气相色谱-质谱联用法测得碳酸二甲酯的产率为7.48%。

英文摘要：

Dimethyl carbonate is directly synthesized by reaction of carbon dioxide and methanol with Ce0.4Zr0.6O2 as catalyst under supercritical conditions.The reaction conditions,such as reaction temperature,reaction pressure and reaction time are optimized through the method of orthogonal test and single factor test.The optimum reaction conditions are as follows： the proportion of Ce0.4Zr0.6O2 and methanol is 1∶50,the reaction temperature is 180 ℃,the reaction pressure is 9.5 MPa and the reaction time is 8 h.Under these optimum conditions,the yield of dimethyl carbonate is 7.48% by GC-MS analysis.