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Oxidative dehydrogenation of n-butane and 1-butene on undoped and K-doped VOx/Al2O3 catalysts |
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| Authors: | J. M. L pez Nieto P. Concepci n A. Dejoz F. Melo H. Kn zinger M. I. V zquez |
| Affiliation: | a Instituto de Tecnología Química, UPV-CSIC, Avenida de los Naranjos s/n, 46022 Valencia, Spain b Institut für Physikalische Chemie, LMU München, 81377 München, Germany c Departamento de Ingeniería Química, Univ. Valencia, 46100 Burjassot, Spain |
| Abstract: | The oxidative dehydrogenation (OXDH) of n-butane and 1-butene on undoped and K-doped alumina-supported vanadia catalysts has been studied. The low selectivity to OXDH products on alumina-supported vanadia catalysts is a consequence of the isomerization of olefins (low temperatures) and the formation of carbon oxides (high temperatures) on acid sites. The presence of potassium results in a decrease of the number of acid sites and a higher selectivity to OXDH products from both n-butane and 1-butene. Infrared spectroscopy data of 1-butene adsorbed on the catalysts suggest the presence of different adsorbed species: (i) O-containing species on the undoped catalyst, or (ii) adsorbed butadiene on K-doped catalyst. A reaction network including parallel and consecutive reactions is proposed. |
| Keywords: | Oxidative dehydrogenation VOx/Al2O3 catalysts Infrared spectroscopy |
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