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On the influence of the acid-base character of catalysts on the oxidative dehydrogenation of alkanes

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Abstract

Vanadium oxides supported on metal oxide, i.e. Al2O3, MgO and Mg-Al mixed oxide, and V-containing microporous materials (VAPO-5 and MgVAPO-5) have been tested in the oxidative dehydrogenation of C2-C4 alkanes. In all cases, tetrahedral vanadium species (isolated and/or associated) were mainly observed from51V-NMR and diffuse reflectance spectroscopies. The reducibility of V5+-species, determined from the onset-reduction temperature, decreases as follows: VOx/AL > VAPO-5 > MgVAPO-5 =VOx/MG > VOx/MG + AL. The acid character of catalysts, determined from the FTIR spectra of pyridine adsorbed, decreases as: MgVAPO-5 > VOx/AL > VAPO-5 > VOx/MG + AL > VOx/MG. A similar trend between V-reducibility of the catalyst and its catalytic activity for the alkane conversion was observed. However, the selectivity to olefins depends on the acid-base character of catalyst and the alkane fed. In the ODH ofn-butane, the higher the acid character of the catalyst the lower the selectivity to C4-olefins, while in the ODH of ethane an opposite trend between the catalyst acidity and the selectivity to ethene was observed.

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Authors and Affiliations

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

    P. Concepción, A. Galli & J. M. López Nieto

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

    A. Dejoz & M. I. Vazquez

Authors
  1. P. Concepción
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  2. A. Galli
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  3. J. M. López Nieto
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  4. A. Dejoz
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  5. 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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Concepción, P., Galli, A., Nieto, J.M.L. et al. On the influence of the acid-base character of catalysts on the oxidative dehydrogenation of alkanes. Top Catal 3, 451–460 (1996). https://doi.org/10.1007/BF02113867

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