摘要
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.
出处
《厦门大学学报(自然科学版)》
CAS
CSCD
北大核心
1995年第4期566-571,共6页
Journal of Xiamen University:Natural Science