Active site of praseodymium orthovanadate catalyst in oxidative dehydrogenation of propane |
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| Authors: | Weide Zhang Chaktong Au Huilin Wan |
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| Institution: | (1) Department of Chemistry and State Key Laboratory for Physical Chemistry of Solid Surface, Xiamen University, 361005 Xiamen, China;(2) Department of Chemistry, Hong Kong Baptist University, Hong Kong |
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| Abstract: | The pure phase of praseodymium orthovanadate (PrVO4) has been prepared by the citrate method. The active site of Pr-VO4 was studied by ESR, NO-TPD, O2-TPD and18O2-isotope exchange methods. The results of ESR and NO-TPD confirmed the presence of V4+ in the catalyst.18O2-isotope exchange was through a single exchange procedure. From the result of O2 + TPD and the kinetic study of18O2-isotope exchange, one can reach a conclusion that the V4+ species associated with oxygen vacancies are the site for O2 activation. The adsorbed O2 or O− are the active oxygen species in propane oxidative dehydrogenation. |
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| Keywords: | praseodymium orthovanadate active site propane oxidative dehydrogenation catalyst |
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