Abstract
Electron spin resonance (ESR) studies of Pt/WO x /ZrO2 catalysts over the temperature range of 5–330 K are reported. Two sets of ESR signals, one with g ⊥=1.98 and g ‖=1.96 and the other with g x =1.39, g y =1.70 and g z =1.54 are identified as intrinsic signals from the W5+ and Zr3+ states, respectively, formed in the sample. These signals are absent in samples without Pt. Studies on samples annealed at 773 K showed possible electron transfer between the W5+ and Zr3+ states in which the concentration of one state increases at the expense of the other.
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Punnoose, A., Seehra, M. ESR Observation of W5+ and Zr3+ States in Pt/WOx/ZrO2 Catalysts. Catalysis Letters 78, 157–160 (2002). https://doi.org/10.1023/A:1014985607928
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DOI: https://doi.org/10.1023/A:1014985607928