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The effect of potassium on the selective oxidation ofn-butane and ethane over Al2O3-supported vanadia catalysts

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Abstract

The catalytic properties of undoped and K-doped (K/V atomic ratio of 0.5) Al2O3-supported vanadia catalysts (∼4.5 wt% of V2O5) for the oxidation ofn-butane and ethane were studied. Isolated tetrahedral V5+ species are mainly observed in both undoped and K-doped samples. The incorporation of potassium decreases both the reducibility of surface vanadium species and the number of surface acid sites. Potassium-free vanadium catalysts show a high selectivity during the oxidative dehydrogenation (ODH) of ethane but a low selectivity during the ODH ofn-butane. However, the presence of potassium on the vanadium catalysts strongly influences their catalytic properties, increasing the selectivity to C4-olefins fromn-butane and decreasing the selectivity to ethene from ethane. The role of the acid-base characteristics of catalysts on selectivity to ODH reactions is proposed.

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Authors and Affiliations

  1. Instituto de Tecnología Química, UPV-CSIC, Avenida de los Naranjos s/n, 46071, Valencia, Spain

    A. Galli & J. M. López Nieto

  2. Departamento de Ingeniería Química, Universidad de Valencia, Dr. Moliner 50, 46100, Burjasot, Spain

    A. Dejoz & M. I. Vazquez

Authors
  1. A. Galli
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  2. J. M. López Nieto
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  3. A. Dejoz
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  4. M. I. Vazquez
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On leave from the Department of Industrial Chemistry and Materials, V. le Risorgimento 4, 40136 Bologna, Italy.

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Galli, A., López Nieto, J.M., Dejoz, A. et al. The effect of potassium on the selective oxidation ofn-butane and ethane over Al2O3-supported vanadia catalysts. Catal Lett 34, 51–58 (1995). https://doi.org/10.1007/BF00808321

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  • DOI: https://doi.org/10.1007/BF00808321

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