利用XRD、XPS、SEM、EPMA技术 ,对CO气相催化氧化偶联制草酸二乙酯催化剂进行分析 ,研究表明不同焙烧温度得到的催化剂不同 ;在循环反应过程中 ,催化剂活性中心Pd原子经历了从Pd0 变成Pd+ 1到Pd+ 2 的过程 ,生成二烷氧基化合物 ;CO偶联反应进行时 ,活性中心Pd原子由Pd+ 2 还原为Pd0 ,活性中心原子Pd在循环反应中起价态调变作用 ,依据CO气相偶联合成草酸二乙酯的主要反应原理 ,初步证实反应历程是按“共催化循环”模式进行。 XRD, XPS, SEM and EPMA techniques were used to analyze the catalysts for the CO coupled catalytic oxidation of diethyl oxalate. The results show that the catalysts obtained at different calcination temperatures are different. During the cyclic reaction, Pd0 into Pd + 1 to Pd +2 process to generate dialkoxy compounds; CO coupling reaction is carried out, the active center Pd atom Pd4 reduction to Pd0, the active center atom Pd in ​​the cycle reaction from the state of the role of modulation, According to CO gas-phase coupling synthesis of diethyl oxalate main reaction principle, preliminary confirmed that the reaction process is based on “co-catalytic cycle” mode.