Using AP-XPS, the surface chemical properties of Pt(110) are investigated during CO oxidation process at various reaction conditions. At the onset of CO oxidation reaction, both of surface oxide and chemisorbed oxygen are observed. Due to exothermic nature of CO oxidation, the temperature of Pt surface sharply increases as CO oxidation takes places. Then, as the pressure of CO gas increases, the surface temperature continuously rises with higher CO<sub>2</sub> production. Interestingly, as the reactivity increases, the amount of chemisorbed oxygen reduces while the amount of surface oxide remains unchanged. The nature of catalytically active phase on Pt(110) surface will be discussed.

Revisiting CO oxidation on Pt(110) surface with ambient pressure XPS

254th National Meeting (2017)

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