Catalytic dense membranes of doped Bi4V2O11 (BIMEVOX) for selective partial oxidation: chemistry of defects vs. catalysis - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2005

Catalytic dense membranes of doped Bi4V2O11 (BIMEVOX) for selective partial oxidation: chemistry of defects vs. catalysis

Résumé

A catalytic dense membrane reactor (CDMR) is used to physically separate the reaction step from the reoxidation of the catalyst. By decoupling the redox mechanism prevailing in mild oxidation of hydrocarbons, the operating conditions may be optimized resulting in an increase of selectivity. The membranes are made up of BIMEVOX oxides, obtained by partial substitution of V in c-Bi4V2O11 by ME (Co, Cu, Ta). Experiments performed on BIMEVOX dense membranes using propene and propane are described in terms of, (i) active sites on polished or unpolished surfaces, (ii) operating conditions (T, pO2 in the high oxygen partial pressure compartment), which determine the selectivity, either to mild oxidation products (acrolein, hexadiene, CO), or to partial oxidation products (CO, H2), and, (iii) nature of ME cations and relative properties. The discussion deals with the respective role of electronic versus oxide ion conductivities which depend on defects in the structure as well as on the redox properties of cations.

Domaines

Catalyse
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Dates et versions

hal-00104123 , version 1 (05-10-2006)

Identifiants

  • HAL Id : hal-00104123 , version 1

Citer

Axel Löfberg, Hervé Bodet, Caroline Pirovano, César Steil, Rose-Noëlle Vannier, et al.. Catalytic dense membranes of doped Bi4V2O11 (BIMEVOX) for selective partial oxidation: chemistry of defects vs. catalysis. 3rd Irsee Symposium on Selective Oxidation Catalysis, 2005, Irsee, Germany. ⟨hal-00104123⟩
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