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• W2016087156 abstract "The structural transformations which occur when a VOHPO4·0.5H2O precursor is activated in a mixture of n-butane–air at 400 °C have been studied using a combination of XRD, TEM and 31P NMR spin–echo mapping. The VOHPO4·0.5H2O precursor was prepared by reducing V2O5 with isobutyl alcohol and had a plate-like morphology with a [001] normal. A systematic series of ‘activated’ catalysts were then prepared in which the activation time was varied between 0.1 and 132 h. Structural characterisation studies on these samples show the structural evolution of the catalyst during the activation procedure. At the periphery of the platelet a direct topotactic transformation from [001] VOHPO4·0.5H2O to [100](VO)2P2O7 occurs. In the interior of the platelet a more complex indirect transformation sequence occurs. Regions are shown to exist where the VOHPO4·0.5H2O precursor initially transforms epitaxially into δ-VOPO4. As the activation time increases the domains of δ-VOPO4, which are embedded in a disordered matrix, shrink and further transform to the final (VO)2P2O7 phase. An attempt has also been made to correlate measured catalytic performance data with the catalyst microstructure at various stages of the transformation process. It is found that there is a distinct parallel between improving catalytic performance and a decrease in the amount of V5+ phases present. A further sample of the same hemihydrate precursor was activated in a pure N2 atmosphere for comparison. In this case, the whole VOHPO4·0.5H2O platelet was observed to undergo a direct topotactic transformation to the (VO)2P2O7 phase. The transformation mechanism, however, involved the homogeneous nucleation of discrete epitaxial patches of crystalline (VO)2P2O7 over the surface of the platelet. This is followed by the growth and eventual coalescence of the patches upon extended activation." @default.
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• W2016087156 date "1996-01-01" @default.
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• W2016087156 title "Structural transformation sequences occurring during the activation of vanadium phosphorus oxide catalysts" @default.
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• W2016087156 doi "https://doi.org/10.1039/fd9960500103" @default.
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