Reactivity of supported vanadium oxide catalysts: The partial oxidation of methanol

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

DOI:https://doi.org/10.1006/jcat.1994.1071· OSTI ID:7185299

Deo, G; Wachs, I E ^[1]

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1. Lehigh Univ., Bethlehem, PA (United States)

The partial oxidation of methanol was used to probe the reactivity of the surface vanadium oxide redox sites present in supported vanadium oxide catalysts. Formaldehyde was the main oxidation product for all the supported vanadium oxide catalysts operating under differential reactor conditions. The methanol oxidation turnover frequency (TOF) of the surface vanadium oxide phase varies by three orders of magnitude when the support is changed from ZrO[sub 2]/TiO[sub 2] (10[sup 0] s[sup [minus]1]) to SiO[sub 2] (10[sup [minus]3]). The TOF of the surface vanadium oxide phase supported on Nb[sub 2]O[sub 5] (10[sup [minus]1]s[sup [minus]1]) and Al[sub 2]O[sub 3] (10[sup [minus]2] s[sup [minus]1]) have intermediate values with surface vanadium oxide phase on Nb[sub 2]O[sub 5] having a TOF very close to ZrO[sub 2] or TiO[sub 2]. The TOF of the surface vanadium oxide phase on all the oxide supports is essentially independent of the vanadium oxide loading below monolayer coverage. The similar structures of the surface vanadium oxide phase on the different oxide supports as well as the independence of the TOF with respect to vanadium oxide surface coverage suggests that a structural difference is not responsible for the difference in reactivity of the various supported vanadium oxide catalysts. It is proposed that the number of participating surface vanadium oxide sites is most probably related to the reductibility of the V-O-Support bond since this bridging bond strength controls the reductibility of the supported vanadium oxide catalysts. 51 refs., 3 figs., 9 tabs.

• OSTI ID: 7185299
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 146:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

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ALCOHOLS
ARRHENIUS EQUATION
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
EQUATIONS
HETEROGENEOUS CATALYSIS
HYDROXY COMPOUNDS
METHANOL
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTIAL OXIDATION PROCESSES
THERMOCHEMICAL PROCESSES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES