On the mechanism of n-butane oxidation to maleic anhydride on VPO catalysts. II. Study of the evolution of the VPO catalysts under n-butane, butadiene, and furan oxidation conditions

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1034· OSTI ID:7233097

Zhang-Lin, Y; Vedrine, J C; Volta, J C ^[1]; Forissier, M ^[2]

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1. Institut de Recherches sur la Catalyse, Villeurbanne (France)
2. Genie catalytique des Reacteurs de Raffinage, St. Symphorien d'Ozon (France)

The evolution of the VOPO[sub 4] phases and of (VO)[sub 2]P[sub 2]O[sub 7] and the activated VPO catalyst has been studied by XRD, [sup 31]P MAS-NMR, laser Raman spectroscopy, and electron spin resonance after the oxidation of butane, butadiene, and furan. With the exception of [sigma]VOPO[sub 4], which partly changes to [alpha][sub 11] VOPO[sub 4], almost no evolution of the bulk structure has been observed. It is concluded that the mechanism of butane oxidation on the VPO catalyst implies principally the participation of a limited number of superficial layers of the structure. Catalytic properties depend on the redox properties of a limited number of V[sup 5+] ensembles on the (VO)[sub 2]P[sub 2]O[sub 7] matrix. A proposal for the mechanism of n-butane oxidation which implies an alkoxide route is presented. 22 refs., 10 figs., 1 tab.

• OSTI ID: 7233097
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 145:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
BUTADIENE
BUTANE
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
DIENES
FURANS
HETEROCYCLIC COMPOUNDS
HETEROGENEOUS CATALYSIS
HYDROCARBONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHOSPHORUS 31
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
PHOSPHORUS OXIDES
POLYENES
RESONANCE
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES