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用热导-气相色谱(TC-GC)同步跟踪法研究了CO在Pt/Al_2O_3上的TPD,观察到CO的TC-TPD谱为一条温度从331-776K的宽带。跟踪谱带上各点的化学组成,发现宽带系由两个CO和两个CO_2的脱附峰叠加成的。当样品经高温氢处理后,观察到CO的吸附量、TPD和TPSR谱都发生了显著的变化,这些变化与稳态下CO选择氧化的转换频率有对应关系。高温氢处理对CO的加氢反应性则无明显影响。
The TPD of CO over Pt / Al 2 O 3 was investigated by TC-GC synchronous tracking method. The TC-TPD spectrum of CO was observed to be a broad band with a temperature from 331-776K. Following the chemical composition of each point on the band, it was found that the broadband band was composed of two CO and two CO 2 desorption peaks. When the samples were treated with hydrogen at high temperature, the adsorption capacity of CO was observed, and both the TPD and TPSR spectra were changed significantly. These changes have a corresponding relationship with the conversion frequency of CO selective oxidation at steady state. Hydrogenation at high temperature has no obvious effect on the hydrogenation reactivity of CO.