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用程序升温脱附(T.P.D.)和程序升温表面反应(T.P.S.R.)方法研究了CO、H_2、CO_2在Cu-Zn-Al甲醇合成催化剂上的吸附、脱附行为。采用质谱仪和热导池同时作检测器。实验中观察到H_2对CO或CO_2的顶替作用及在吸附CO过程和脱附过程中有CO_2产生。提出了在同——活性中心—铜上吸附的H_2和CO生成表面中间物HCO*的假设。
The adsorption and desorption behaviors of CO, H_2 and CO_2 on Cu-Zn-Al catalyst for methanol synthesis were investigated by temperature programmed desorption (T.P.D.) and temperature programmed surface reaction (T.P.S.R.). Using mass spectrometer and thermal conductivity of the pool at the same time as a detector. In experiments, we observed the displacement of H_2 to CO or CO_2 and the production of CO_2 during the process of CO adsorption and desorption. The hypothesis that H 2 O and CO generated on the same active site-copper adsorbed on surface HCO * was proposed.