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- W2009284860 abstract "γ-Bismuth molybdate (γ-Bi 2 MoO 6 ) surfaces reduced by C 3 H 6 , reoxidized by oxygen, on exposure to C 3 H 6 -jet and subsequently O 2 -jet were time- or temperature-dependently measured by X-ray photoelectron spectroscopy (XPS). The C 3 H 6 molecule interacted simultaneously with two different lattice oxide ions to result in almost equivalent amounts of Mo 5+ and Mo 4+ , but reduced species of bismuth were not found. The Mo 5+ appeared likely to be formed by oxygen abstraction from Bi 3+ –O-Mo 6+ and the Mo 4+ from those of O=Mo 6+ along with the elimination of two oxide ions bound on both sides of the [MoO 2 ] 2+ layer. A part of Mo 5+ was reoxidized faster than Mo 4+ , below 373 K, while above 473 K Mo 4+ was reoxidized preferentially. On exposure to C 3 H 6 -jet and O 2 -jet under ultrahigh vacuum (UHV), only Mo 5+ was detected on the surface and the core spectrum intensity of Mo 5+ oscillated with respect to exposure time. The oscillation phenomena were interpreted by the time lags between the surface reduction rate with C 3 H 6 and the diffusion rate of oxygen from the oxide bulk, and by the difference between the surface reoxidation (oxygen incorporation) rate and the diffusion rate of newly incorporated oxygen into the bulk anion vacancies. It was also clarified that incorporation of oxygen occurred on the lattice oxide ion vacancies bridging Bi and adjacent Mo atom." @default.
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- W2009284860 title "X-Ray Photoelectron Spectroscopic Study on γ-Bismuth Molybdate Surfaces on Exposure to Propene and Oxygen" @default.
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- W2009284860 doi "https://doi.org/10.1143/jjap.39.4335" @default.
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