Partial oxidation reactions on phosphate-based catalysts |
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Authors: | Védrine Jacques C |
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Affiliation: | (1) Leverhulme Centre for Innovative Catalysis, Department of Chemistry, The University of Liverpool, Oxford Street, PO Box 147, Liverpool L69 7ZD, UK |
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Abstract: | In this work emphasis has been placed on phosphate-based catalysts used for partial oxidation reactions, such as vanadyl pyrophosphate,
iron phosphates and hydrogen/hydroxy-phosphates, zirconium hydrogen phosphates as layered compounds used to stabilise/entrap
Cr and V oxyhydroxy-macrocations. It is shown that, in partial oxidation reactions, the catalyst surface behave in a rather
dynamic and labile way, reconstructing under activation and/or catalytic reaction conditions and adapting itself to the stereochemistry
of the reactants. The active sites are shown to have a molecular size, to be isolated and to present several catalytic functions,
as hydrocarbon activation, H atom abstraction, lattice oxygen incorporation and electron transfer through the solid material
to allow the redox process to occur. The metal cations are the active species and the role of the phosphate tetrahedra is
not only to bind the MO6 octahedra together to constitute a dense or layered compound but also to bring some specific redox and acid–base properties.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | partial oxidation reactions butane to maleic anhydride isobutyric acid to methacrylic acid ethane to ethene VPO catalyst FePO catalyst V2O5 and Cr2O3 supported on zirconium phosphates |
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