CO is a useful probe in the characterization of surface properties of both metal and metal oxide via adsorption. Adsorption of CO was used to monitor the possible active site of an Au/TiO2 catalyst for the CO oxidation reaction. CO adsorption on the reduced catalyst results in the band at 2104 cm−1 indicative of Au0. During the reaction (in the presence of both CO and O2 present) the band is shifted to higher wave numbers indicating non-competitive adsorption on the surface of Au species. This study also reveals the relationship between the presence of CO (in the absence of oxygen) and the build-up of surface species such as bicarbonates, formates and carbonate species which decreases the activity of the catalyst. The presence of both the reduced and the cationic species of Au seem to be requirement for the activity of the catalyst.

中文翻译：

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使用漫反射红外傅立叶变换光谱 (DRIFTS) 研究 Au/TiO2 催化剂的活性位点和失活模式

CO 是通过吸附表征金属和金属氧化物的表面特性的有用探针。CO 的吸附用于监测用于 CO 氧化反应的 Au/TiO2 催化剂的可能活性位点。还原催化剂上的 CO 吸附导致 2104 cm-1 处的带指示 Au0。在反应过程中（同时存在 CO 和 O2），谱带移动到更高的波数，表明 Au 物质表面上的非竞争性吸附。这项研究还揭示了 CO 的存在（在没有氧气的情况下）与表面物质（如碳酸氢盐、甲酸盐和碳酸盐物质）的积累之间的关系，这些物质会降低催化剂的活性。Au的还原物质和阳离子物质的存在似乎是催化剂活性的必要条件。