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UV-Vis diffuse reflectance and FT-IR spectroscopic investigation of V2O5 /SiO2 and MoO3 /SiO2 catalysts for partial oxidation of methane to formaldehyde

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Il Nuovo Cimento D

Summary

The structure of the supported phase of differently loaded V2O5 /SiO2 and MoO3 /SiO2 catalysts and the interaction of the surface species with the carrier were studied by DR UV-Vis and FT-IR spectroscopy. In the case of the V2O5 /SiO2 systems, an evolution from isolated to clusterized tetrahedral (Td) V51 containing species was observed passing from low to high loading, whereas complex polymeric structures containing Mo6+ ions in octahedral coordination were found to be overwhelmingly present in MoO3 catalysts at any loading. The isolated V5+ (Td ) species are suggested to be responsible for the high activity of low-loaded V2O5 /SiO2 samples, while the poor catalytic performances of MoO3 /SiO2 indicate that polymolybdate species are almost inactive in the partial oxidation of methane to formaldehyde.

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Authors and Affiliations

  1. Dipartimento di Chimica, IFM dell’Università di Torino, via P. Giura 7, I- 10125, Torino, Italy

    G. Martra, P. Vittone & S. Coluccia

  2. Dipartimento di Chimica Industriale dell’ Università di Messina, Salita Sperone 31, I- 98186, S. Lucia (Messina), Italy

    F. Arena & A. Parmaliana

Authors
  1. G. Martra
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  2. P. Vittone
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  3. S. Coluccia
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  4. F. Arena
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  5. A. Parmaliana
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Correspondence to G. Martra.

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Martra, G., Vittone, P., Coluccia, S. et al. UV-Vis diffuse reflectance and FT-IR spectroscopic investigation of V2O5 /SiO2 and MoO3 /SiO2 catalysts for partial oxidation of methane to formaldehyde. Nouv Cim D 19, 1727–1734 (1997). https://doi.org/10.1007/BF03185368

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  • DOI: https://doi.org/10.1007/BF03185368

PACS 82.65

PACS 78.40

PACS 82.65.Jv

PACS 01.30.Cc

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