caa a22 4500 475843444 CHVBK 20180406123907.0 cr unu---uuuuu 170329e20000401xx s 000 0 eng 10.1023/A:1027260217007 doi (NATIONALLICENCE)springer-10.1023/A:1027260217007 On the intrinsic activity of vanadium centres in the oxidative dehydrogenation of propane over V-Ca-O and V-Mg-O catalysts [Elektronische Daten] [R.X. Valenzuela, V. Cortés Corberán] The performance of V-Ca-O catalysts for the oxidative dehydrogenation of propane has been studied for the first time, being compared with that of similar V-Mg-O catalysts, and their differences are interpreted in terms of their physico-chemical properties. The VCaO catalyst showed the same initial selectivity to propene as the most selective VMgO composition, but it decreased faster with increasing propane conversion. Vanadium species present in the catalyst surface were different for the two supports: isolated V5+ tetrahedra on CaO and magnesium orthovanadate and pyrovanadate on MgO. The intrinsic activity of isolated vanadium centres in the surface of the V-Ca-O catalyst was more than one order of magnitude higher than that of dimeric or polymeric tetahedral species in the magnesium-containing catalysts. Kluwer Academic Publishers, 2000 MgO-supported vanadia nationallicence oxidative dehydrogenation nationallicence propane nationallicence vanadium-magnesium oxide nationallicence vanadium-calcium oxide nationallicence intrinsic activity nationallicence vanadium centres nationallicence Valenzuela R.X. Instituto de Catálisis y Petroleoquímica, CSIC, Campus UAM Cantoblanco, 28049, Madrid, Spain aut Cortés Corberán V. Instituto de Catálisis y Petroleoquímica, CSIC, Campus UAM Cantoblanco, 28049, Madrid, Spain aut Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 11-12/1-4(2000-04-01), 153-163 1022-5528 11-12:1-4<153 2000 11-12 11244 https://doi.org/10.1023/A:1027260217007 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1027260217007 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Valenzuela R.X. Instituto de Catálisis y Petroleoquímica, CSIC, Campus UAM Cantoblanco, 28049, Madrid, Spain aut NATIONALLICENCE 700 1- Cortés Corberán V. Instituto de Catálisis y Petroleoquímica, CSIC, Campus UAM Cantoblanco, 28049, Madrid, Spain aut NATIONALLICENCE 773 0- Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 11-12/1-4(2000-04-01), 153-163 1022-5528 11-12:1-4<153 2000 11-12 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer