Bi2V1-xMexO5.5-y (Me = Ta, Ni) Membranes for Selective Oxidation of C1-C3 Alkanes in a Catalytic Dense Membrane Reactor - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Catalysis Today Année : 2006

Bi2V1-xMexO5.5-y (Me = Ta, Ni) Membranes for Selective Oxidation of C1-C3 Alkanes in a Catalytic Dense Membrane Reactor

Résumé

Pure and Me-doped Bi2V1-xMexO5.5-y (BIMEVOX) (Me = Ta, Ni) materials exhibit a transient behaviour during the oxidation of C1-C3 alkanes when shaped as dense membranes separating two compartments fed with diluted hydrocarbon and with air, respectively (catalytic dense membrane reactor). Alkenes are first produced at low conversion and CO and H2 follow at higher conversion. The H2/CO ratio increases up to values close to the stoichiometric ones and continues to increase after a peak of activity during which coke builds up. The same transient phenomena as initially observed happen after burning the coke by replacing diluted hydrocarbon by air. This in situ regeneration of the membrane means that the structure and integrity of the membranes have not been modified, as indeed shown by physicochemical analyses (XRD, SEM, XPS). The catalytic properties are mainly related to the presence of ME which affects the electronic conductivity of the materials. At variance with quite neutral BITAVOX, the behaviour of BINIVOX is close to that of BICOVOX which is also a p-type semiconductor. Only BINIVOX is able to oxidise methane (conversion ca. 22-25 mol%) to syngas at low temperature (650°C) in a quite steady manner.

Domaines

Catalyse
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Dates et versions

hal-00103641 , version 1 (04-10-2006)

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Axel Löfberg, Hervé Bodet, Caroline Pirovano, César Steil, Rose-Noëlle Vannier, et al.. Bi2V1-xMexO5.5-y (Me = Ta, Ni) Membranes for Selective Oxidation of C1-C3 Alkanes in a Catalytic Dense Membrane Reactor. Catalysis Today, 2006, 117, pp.168-173. ⟨10.1016/j.cattod.2006.05.049⟩. ⟨hal-00103641⟩
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