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Characterization of surface species on V/SiO2 and V,Na/SiO2 and their role in the partial oxidation of methane to formaldehyde

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Abstract

Silica-supported vanadium (1–8 wt%) and vanadium (5 wt%)-sodium (0.4 wt%) catalysts have been characterized by laser Raman spectroscopy, temperature-programmed reduction, X-ray photoelectron spectroscopy, NO + NH3 rectangular pulses and oxygen chemisorption. The presence of different vanadium species was correlated with activity and selectivity during the methane partial oxidation reaction. The pre-impregnation of the silica support with sodium favors vanadium dispersion, but strongly diminishes V=O concentration due to the formation of orthovanadate-like compounds. As a result of these modifications, methane conversion is strongly inhibited while formaldehyde decomposition is favored.

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Authors and Affiliations

  1. Instituto de Investigacions en Catálisisy Petroquimica, INCAPE (FIQ, VNL-CONICET), Santiago del Estero 2829, 3000, Santa Fe, Argentina

    S. Irusta, A. J. Marchi, E. A. Lombardo & E. E. Miré

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  1. S. Irusta
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  2. A. J. Marchi
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  3. E. A. Lombardo
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  4. E. E. Miré
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Irusta, S., Marchi, A.J., Lombardo, E.A. et al. Characterization of surface species on V/SiO2 and V,Na/SiO2 and their role in the partial oxidation of methane to formaldehyde. Catal Lett 40, 9–16 (1996). https://doi.org/10.1007/BF00807449

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  • DOI: https://doi.org/10.1007/BF00807449

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