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- W2000357901 abstract "Using gaseous 18O2, we have investigated the respective role of lattice and adsorbed oxygen in the n-butane oxidation to maleic anhydride (MA) and COx on well-crystallized (VO)2P2O7 and on a long term activated VPO catalyst. The reaction was performed at 350°C in a glass reactor, with a dry-ice cold trap and a recirculation pump. The reactor was connected to a mass spectrometer for on-line gas analysis. It has been checked that oxygen isotopic heteroexchange did not occur at a significant rate. The changes with reaction time of the 18O isotopic labelling shows that only lattice oxygen is active for the formation of MA and the other products. For MA, this conclusion has been further confirmed by comparing the experimental evolution of the isotopic distribution (amu 98, 100, 102 and 104) with calculated mass spectra assuming a progressive replacement of lattice 16O by 18O in agreement with a redox mechanism. When the steady-state 18O labelling of products is achieved, the oxygen balance indicates the presence of 18O within a few surface layers of the catalyst. This result has been further confirmed by post-reaction analysis using low energy ion spectroscopy, providing a direct evidence of both 18O and 16O on the surface." @default.
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- W2000357901 date "1997-01-01" @default.
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- W2000357901 title "Nature of active oxygen in the n-butane selective oxidation over well-defined VPO catalysts: an oxygen isotopic labelling study" @default.
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- W2000357901 doi "https://doi.org/10.1016/s0920-5861(96)00097-1" @default.
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