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- W2049740684 abstract "Differently disordered (VO)2P2O7 phases and an amorphous V3+PO catalyst were studied by electron spin resonance (ESR) spectroscopy at various temperatures and in various atmospheres, as well as under catalytic conditions, using an in-situ ESR flow reactor operating in the X band. Exchange integrals and the second and fourth moments of the ESR signals were used to characterize spin-spin exchange in (VO)2P2O7, which depends on the degree of structural disorder. The catalytic activity of (VO)2P2O7 and the maleic anhydride selectivity are enhanced with rising disorder. During butane oxidation a significant reversible alteration of the ESR line shape became evident. This unique effect can only be observed under working conditions and is discussed in terms of a perturbation of exchange interactions between neighbouring vanadyl centres near the surface, the oxidation state of which is assumed to fluctuate between +4 and +5 during the catalytic reaction. In contrast, heating in pure air improves the spin-spin exchange and lowers the disorder by healing lattice defects. The activity of the V3+PO catalyst in the title reaction “awoke” after about 20 min time on stream, simultaneous with the formation of a (VO)2P2O7-like local arrangement of V4+ centres on the catalyst surface." @default.
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- W2049740684 date "1996-08-01" @default.
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- W2049740684 title "In-situ electron spin resonance study of vanadium phosphate catalysts during the selective oxidation of n-butane to maleic anhydride" @default.
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- W2049740684 doi "https://doi.org/10.1016/0927-7757(96)03607-2" @default.
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