改进铜基甲醇合成催化剂XNC208的TPD、TPO和TPR研究

TPD,TPO and TPR Studies of a Modified Copper-Based Catalvst XNC208 for Methanol Synthesis

采用ＴＰＤ、ＴＰＯ和ＴＰＲ等方法对比研究了改进铜基甲醇合成催化剂ＸＮＣ２０８和工业催化剂Ｃ２０７．结果表明，改进的ＸＮＣ２０８催化剂工作表面Ｃｕ￣＋活性位的浓度比未经改进工业催化剂Ｃ２０７高；在甲醇合成实际操作温度下，催化剂工作表面可以维持较高的、对甲醇合成反应能作出贡献的吸附氢和吸附ＣＯ等表面反应物种的稳态浓度，从而有利于甲醇合成速率的提高；改进的ＸＮＣ２０８催化剂工作表面的Ｃｕ￣＋位具有较大的价态稳定性，显示出较强的抗深度还原和抗氧化的双重性能，这与该催化剂具有持久的低温活性和高的热稳定性有着密切的联系。

By means of TPD,TPO and TPR methods,a comparative study of a modi-fied copper- based cactalyst XNC2 08 with an industrial catalyst C207 for methanol synthesisshowed that the surface concentration of Cu￣+-site on functioning XNC2 08 catalyst was higherthan that of C207 catalyst,and that these Cu￣+-sites had higher valence stability, thus demon-strating better performance of resistance to both being oxidized and deeply reduced, and that,under reaction conditions of methanol synthesis,stationary concentrations of both hydrogen-ad-species and CO-adspecies on surface of functioning XNC208 catalyst could be maintained at high-er levels in comparison with C207 catalyst,which would be in favor of enhancement in rate ofmethanol synthesis. These peculiarities have close relation with more persistent activity and high-er thermal stability that XNC208 catalyst has.