用光还原法来提高富氢条件下CO优先氧化(PROX)催化活性和CO2选择性,分别对有无氢气时CO氧化反应参数进行了详尽研究.X射线光电子能谱(XPS)表征结果显示,在光还原催化剂表面产生了部分氧空穴,可为化学吸附H提供活性中心.针对光还原Pt/TiO2催化剂上CO优先氧化反应提出了一种可能的双功能反应机理.%The optimum reaction parameters for CO oxidation in the presence and absence of H2 have been investigated by photoreduction method to enhance the catalytic activity and selectivity of CO2 for CO preferential oxidation (PROX) in H2-rich stream in detail.X-ray photoelectron spectroscoopy (XPS) results showed that part oxygen vacancies produced on the surface of photoreduced catalysts,which maybe the activity site for the chemisorbed H.Therefore,a possible bi-function reaction mechanism for CO preferential oxidation over the photoreduced Pt/TiO2 catalyst has been proposed.
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