caa a22 4500 477080723 CHVBK 20180405111449.0 cr unu---uuuuu 170330e19960801xx s 000 0 eng 10.1007/BF02113867 doi (NATIONALLICENCE)springer-10.1007/BF02113867 On the influence of the acid-base character of catalysts on the oxidative dehydrogenation of alkanes [Elektronische Daten] [P. Concepción, A. Galli, J. Nieto, A. Dejoz, M. Vazquez] 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. J.C. Baltzer AG, Science Publishers, 1996 MgO-, Mg-Al mixed oxide nationallicence Al2O3-supported vanadium oxide nationallicence VAPO-5 nationallicence MgVAPO-5 nationallicence oxidative dehydrogenation of ethane, propane, n -butane nationallicence Concepción P. Instituto de Tecnología Química, UPV-CSIC, Avenida de los Naranjos s/n, 46071, Valencia, Spain aut Galli A. Instituto de Tecnología Química, UPV-CSIC, Avenida de los Naranjos s/n, 46071, Valencia, Spain aut Nieto J. Instituto de Tecnología Química, UPV-CSIC, Avenida de los Naranjos s/n, 46071, Valencia, Spain aut Dejoz A. Departamento de Ingenieria Química, Universidad de Valencia, Dr. Moliner 50, 46100, Burjasot, Spain aut Vazquez M. Departamento de Ingenieria Química, Universidad de Valencia, Dr. Moliner 50, 46100, Burjasot, Spain aut Topics in Catalysis Baltzer Science Publishers, Baarn/Kluwer Academic Publishers 3/3-4(1996-08-01), 451-460 1022-5528 3:3-4<451 1996 3 11244 https://doi.org/10.1007/BF02113867 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02113867 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Concepción P. Instituto de Tecnología Química, UPV-CSIC, Avenida de los Naranjos s/n, 46071, Valencia, Spain aut NATIONALLICENCE 700 1- Galli A. Instituto de Tecnología Química, UPV-CSIC, Avenida de los Naranjos s/n, 46071, Valencia, Spain aut NATIONALLICENCE 700 1- Nieto J. Instituto de Tecnología Química, UPV-CSIC, Avenida de los Naranjos s/n, 46071, Valencia, Spain aut NATIONALLICENCE 700 1- Dejoz A. Departamento de Ingenieria Química, Universidad de Valencia, Dr. Moliner 50, 46100, Burjasot, Spain aut NATIONALLICENCE 700 1- Vazquez M. Departamento de Ingenieria Química, Universidad de Valencia, Dr. Moliner 50, 46100, Burjasot, Spain aut NATIONALLICENCE 773 0- Topics in Catalysis Baltzer Science Publishers, Baarn/Kluwer Academic Publishers 3/3-4(1996-08-01), 451-460 1022-5528 3:3-4<451 1996 3 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer