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Vanadium Supported on Alumina and/or Zirconia Catalysts for the Selective Transformation of Ethane and Methanol

1
Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022 Valencia, Spain
2
Laboratoire des Applications Energétiques de l’Hydrogène, Faculté de Technologie, Université Saad Dahlab, Blida 1, Blida 09000, Algeria
3
Department of Chemical Engineering, Universitat de València, Av. Universitat s/n, 46100 Burjassot, Spain
*
Author to whom correspondence should be addressed.
Catalysts 2018, 8(4), 126; https://doi.org/10.3390/catal8040126
Received: 2 February 2018 / Revised: 13 March 2018 / Accepted: 19 March 2018 / Published: 22 March 2018
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Abstract

Vanadium supported on pure (Al2O3, ZrO2) or mixed zirconia-alumina (with Al/(Al + Zr) ratio of 0.75 or 0.25) catalysts have been prepared by wet impregnation, using homemade prepared supports. The catalysts have been characterized and tested in the oxidative dehydrogenation (ODH) of ethane and in the methanol aerobic transformation. The catalytic performance strongly depends on the nature of the metal oxide support. Thus, activity decreases in the order: VOx/ZrO2 > VOx/(Al,Zr-oxides) > VOx/Al2O3. On the other hand, at low and medium ethane conversions, the selectivity to ethylene presents an opposite trend: VOx/Al2O3 > VOx/(Al,Zr-oxides) > VOx/ZrO2. The different selectivity to ethylene at high conversion is due to the lower/higher initial ethylene formation and to the extent of the ethylene decomposition. Interestingly, VOx/(Al,Zr-oxides) with low Zr-loading present the lowest ethylene decomposition. The catalytic results obtained mainly depend on the nature of the supports whereas the role of the dispersion of vanadium species is unclear. In methanol oxidation, the catalysts tested present similar catalytic activity regardless of the support (Al2O3, ZrO2 or mixed Al2O3-ZrO2) but strong differences in the selectivity to the reaction products. Thus, dimethyl ether was mainly observed on alumina-supported vanadium oxide catalysts (which is associated to the presence of acidic sites on the surface of the catalyst, as determined by TPD-NH3). Formaldehyde was the main reaction product on catalysts supported on Zr-containing oxides (which can be related to a low presence of acid sites). In this article, the importance of the presence of acid sites in ethane ODH, which can be estimated using the methanol transformation reaction, is also discussed. View Full-Text
Keywords: ODH of ethane; ethylene; methanol transformation; formaldehyde; dimethyl ether; vanadium; zirconia; alumina ODH of ethane; ethylene; methanol transformation; formaldehyde; dimethyl ether; vanadium; zirconia; alumina
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Benomar, S.; Massó, A.; Solsona, B.; Issaadi, R.; López Nieto, J.M. Vanadium Supported on Alumina and/or Zirconia Catalysts for the Selective Transformation of Ethane and Methanol. Catalysts 2018, 8, 126.

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