Transient kinetic modeling of the oxidative dehydrogenation of propane over a vanadia-based catalyst in the absence of O2

Hdl Handle:
http://hdl.handle.net/10149/98852
Title:
Transient kinetic modeling of the oxidative dehydrogenation of propane over a vanadia-based catalyst in the absence of O2
Authors:
Balcaen, V. (Veerle); Sack, I. (Isabelle); Olea, M. (Maria); Marin, G. B. (Guy)
Affiliation:
Ghent University. Department of Chemical Engineering. Laboratory for Chemical Technology.
Citation:
Balcaen, V. et. al. (2009) 'Transient kinetic modeling of the oxidative dehydrogenation of propane over a vanadia-based catalyst in the absence of O2', Applied Catalysis A General, 371 (1-2), pp.31-42.
Publisher:
Elsevier
Journal:
Applied Catalysis A General
Issue Date:
15-Dec-2009
URI:
http://hdl.handle.net/10149/98852
DOI:
10.1016/j.apcata.2009.09.014
Abstract:
The oxidative dehydrogenation of propane in the absence of O2 over the vanadia-based EL10V1 Eurocat catalyst is investigated in a Temporal Analysis of Products (TAP) reactor over a completely oxidized catalyst and at reduction degrees up to 0.47. Only CO2 and propene are detected as reaction products at temperatures from 723 to 823 K. The reduction of the catalyst with propane occurs through the formation of propene, the consecutive oxidation of propene to CO2 and the parallel total oxidation of propane. Four elementary reactions are considered as kinetically relevant: (1) the methyl C–H bond dissociation in propane during the formation of propene, (2) the methylene C–H bond breaking in propane to form surface isopropoxide, which finally transforms into CO2, (3) the CC double bond breaking in propene in the formation of surface formate species and (4) the oxidation of these surface formate species to CO2. The formation of propene via (1) is favored at the investigated conditions, while CO2 is largely produced by the sequential oxidation of propene (3–4), and to a lesser extent by the parallel route of the direct total oxidation of propane (2). Both the oxidative dehydrogenation and the direct total oxidation of propane reaction paths involve only one kinetically relevant step, (1) respectively (2), with an activation energy of 36 and 74 kJ mol−1 over a completely oxidized catalyst and of 15 and 40 kJ mol−1 over a partially reduced catalyst. The further oxidation of propene involves two kinetically relevant steps (3–4) of which only the double bond breaking (3) is slightly activated (5 kJ mol−1) over the completely oxidized catalyst, while both steps are non-activated when the catalyst is partially reduced.
Type:
Article
Language:
en
Keywords:
vanadia-based catalyst; reduction; propane; TAP; kinetic modeling
ISSN:
0926-860X
Rights:
Author can archive post-print (ie final draft post-refereeing). For full details see http://www.sherpa.ac.uk/romeo/ [Accessed 14/05/2010]
Citation Count:
0 [Web of Science and Scopus, 14/05/2010]

Full metadata record

DC FieldValue Language
dc.contributor.authorBalcaen, V. (Veerle)en
dc.contributor.authorSack, I. (Isabelle)en
dc.contributor.authorOlea, M. (Maria)en
dc.contributor.authorMarin, G. B. (Guy)en
dc.date.accessioned2010-05-14T14:40:55Z-
dc.date.available2010-05-14T14:40:55Z-
dc.date.issued2009-12-15-
dc.identifier.citationApplied Catalysis A General; 371(1-2):31-42en
dc.identifier.issn0926-860X-
dc.identifier.doi10.1016/j.apcata.2009.09.014-
dc.identifier.urihttp://hdl.handle.net/10149/98852-
dc.description.abstractThe oxidative dehydrogenation of propane in the absence of O2 over the vanadia-based EL10V1 Eurocat catalyst is investigated in a Temporal Analysis of Products (TAP) reactor over a completely oxidized catalyst and at reduction degrees up to 0.47. Only CO2 and propene are detected as reaction products at temperatures from 723 to 823 K. The reduction of the catalyst with propane occurs through the formation of propene, the consecutive oxidation of propene to CO2 and the parallel total oxidation of propane. Four elementary reactions are considered as kinetically relevant: (1) the methyl C–H bond dissociation in propane during the formation of propene, (2) the methylene C–H bond breaking in propane to form surface isopropoxide, which finally transforms into CO2, (3) the CC double bond breaking in propene in the formation of surface formate species and (4) the oxidation of these surface formate species to CO2. The formation of propene via (1) is favored at the investigated conditions, while CO2 is largely produced by the sequential oxidation of propene (3–4), and to a lesser extent by the parallel route of the direct total oxidation of propane (2). Both the oxidative dehydrogenation and the direct total oxidation of propane reaction paths involve only one kinetically relevant step, (1) respectively (2), with an activation energy of 36 and 74 kJ mol−1 over a completely oxidized catalyst and of 15 and 40 kJ mol−1 over a partially reduced catalyst. The further oxidation of propene involves two kinetically relevant steps (3–4) of which only the double bond breaking (3) is slightly activated (5 kJ mol−1) over the completely oxidized catalyst, while both steps are non-activated when the catalyst is partially reduced.en
dc.language.isoenen
dc.publisherElsevieren
dc.rightsAuthor can archive post-print (ie final draft post-refereeing). For full details see http://www.sherpa.ac.uk/romeo/ [Accessed 14/05/2010]en
dc.subjectvanadia-based catalysten
dc.subjectreductionen
dc.subjectpropaneen
dc.subjectTAPen
dc.subjectkinetic modelingen
dc.titleTransient kinetic modeling of the oxidative dehydrogenation of propane over a vanadia-based catalyst in the absence of O2en
dc.typeArticleen
dc.contributor.departmentGhent University. Department of Chemical Engineering. Laboratory for Chemical Technology.en
dc.identifier.journalApplied Catalysis A Generalen
ref.citationcount0 [Web of Science and Scopus, 14/05/2010]en
or.citation.harvardBalcaen, V. et. al. (2009) 'Transient kinetic modeling of the oxidative dehydrogenation of propane over a vanadia-based catalyst in the absence of O2', Applied Catalysis A General, 371 (1-2), pp.31-42.-
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