The V{sup 4}+/V{sup 5+} balance as a criterion of selection of vanadium phosphorus oxide catalysts for n-butane oxidation to maleic anhydride: A proposal to explain the role of Co and Fe dopants

Journal Article · Fri Feb 28 23:00:00 EST 1997 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1997.1513· OSTI ID:478780

Sananes-Schulz, M T ^[1]; Tuel, A; Volta, J C ^[1]; Hutchings, G J ^[2]

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1. CNRS, Villeurbanne (France)
2. Univ. of Liverpool (United Kingdom)

Vanadium phosphorous oxide catalysts (VPO) are well known for the oxidation of n-butane to maleic anhydride, and many papers and patents have been published in the literature on this catalytic system. Concerning the valence state of vanadium in the active surface, a V{sup 4+}/V{sup 5+} equilibrium on the surface of a vanadyl pyrophosphate during n-butane oxidation has been demonstrated which is dependent on the time of activation. In the present note, we study the modifications, as determined by {sup 31}P NMR by spin echo mapping, which are induced in the physicochemical characteristics of VPO catalysts which have major differences in their morphologies when doped with iron and cobalt at a low percentage (1%) and the correlation with their catalytic performances. 21 refs., 5 figs., 2 tabs.

• OSTI ID: 478780
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 166; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
40 CHEMISTRY
BUTANE
CATALYTIC EFFECTS
COBALT
CRYSTAL DOPING
IRON
NUCLEAR MAGNETIC RESONANCE
PARTIAL OXIDATION PROCESSES
PHOSPHORUS OXIDES
VALENCE
VANADIUM