Propane oxidative dehydrogenation on silica based oxide catalysts |
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| Authors: | Adolfo Parmaliana Valerii Sokolovskii Francesco Arena Francesco Frusteri Danila Miceli |
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| Affiliation: | (1) Dipartimento di Chimica Industriale, Università degli Studi di Messina, Salita Sperone cp 29, I-98166 S. Agata (Messina), Italy;(2) Department of Chemistry, University of the Witwatersrand, 2050 Johannesburg, PO Wits, South Africa;(3) Istituto CNR-TAE, Salita S. Lucia 39, I-98126 S. Lucia (Messina), Italy |
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| Abstract: | The oxidative dehydrogenation of propane to propylene with molecular O2 (PPD) has been investigated on commercial bare SiO2 and medium loaded V2O5 and MoO3 catalysts at 450–525°C. The direct relationship between the density of reduced sites ( , 1016 sr g
cat–
1
), evaluated in steady-state conditions by O2 chemisorption, and the POD reaction rate proves the occurrence of a  concerted reaction mechanism involving the activation of gas-phase O2 on the reduced sites of the catalyst surface. A straight-line correlation between the activity of such silica based catalysts in POD and methane partial oxidation to formaldehyde (MPO) at 525°C has been disclosed. |
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| Keywords: | silica catalysts propylene propane oxidative dehydrogenation reduced sites vanadia/silica catalysts |
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