| Summary: | Developing a catalyst with high SO<sub>2</sub> and H<sub>2</sub>O resistance to achieve high-performance CO oxidation for specific industrial applications is highly desirable. Here, three catalysts were prepared using cerium titanium composite oxide (CeTi), molybdophosphate with Keggin structure-modified CeTi (Keg-CeTi), and molybdophosphate without Keggin structure-modified CeTi (MoP-CeTi) as supports, and their sulfur and water resistance in CO oxidation were tested. The characterization of XRD, BET, SO<sub>2</sub>/H<sub>2</sub>O-DRIFTS, XPS, TEM, SEM, NH<sub>3</sub>/SO<sub>2</sub>-TPD, H<sub>2</sub>-TPR, and ICP techniques revealed that the high SO<sub>2</sub> and H<sub>2</sub>O resistance of Pt/Keg-CeTi in CO oxidation was related to its stronger surface acidity, better reduction of surface cerium and molybdenum species, and lower SO<sub>2</sub> adsorption and transformation compared to Pt/CeTi and Pt/MoP-CeTi.
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