Abstract
We present a Pt/ZrO2 catalyst that can operate in the harsh conditions of methane oxidation without being deactivated by SO2. XPS analysis of 1%Pt/ZrO2 catalyst revealed the presence of stable Pt2+–Pt4+ and Pt2+–Zr4+ bifunctional catalytic sites of dipolar nature at the Pt–ZrO2 interface. These sites increase the probability of CH4 polarization, increasing the strength of their collision with the catalyst surface, lowering the C–H bond energy and facilitating the abstraction of the first hydrogen in adsorbed CH4. The resistance of the catalyst to deactivation by sulfur poisoning is explained considering the stronger interaction of SO2 with Pt2+–Zr4+ dipolar sites, presenting a higher dipolar electric potential than Pt2+–Pt4+, on which CH4 adsorption and oxidation occur.
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The authors acknowledge Vicerrectoría de Investigación y Estudios de Posgrado (BUAP) (Grant No. Nat 2020-46), and Secretaría de Energía (Mexico) (Grant No. Cluster Biodiesel 250014), Consejo Nacional de CIencia y Tecnología (Mexico) (Grant No. Cluster Biodiesel 250014) for their financial supports.
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Torralba, R., Corro, G., Rosales, F. et al. Total Oxidation of Methane Over Sulfur Poisoning Resistant Pt/ZrO2 Catalyst: Effect of Pt2+–Pt4+ and Pt2+–Zr4+ Dipoles at Metal-Support Interface. Catal Lett 151, 1592–1603 (2021). https://doi.org/10.1007/s10562-020-03411-9
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DOI: https://doi.org/10.1007/s10562-020-03411-9