TAP studies on the reoxidation of some partially reduced vanadia-based catalysts

Hdl Handle:
http://hdl.handle.net/10149/98944
Title:
TAP studies on the reoxidation of some partially reduced vanadia-based catalysts
Authors:
Sack, I. (Isabelle); Olea, M. (Maria); Poelman, H. (Hilde); Eufinger, K. (Karin); de Gryse, R. (Roger); Marin, G. B. (Guy)
Affiliation:
Ghent University. Department of Chemical Engineering. Laboratorium voor Petrochemische Techniek.
Citation:
Sack, I. et. al. (2004) 'TAP studies on the reoxidation of some partially reduced vanadia-based catalysts', Catalysis Today, 91-92, pp.149-153.
Publisher:
Elsevier
Journal:
Catalysis Today
Issue Date:
15-Jul-2004
URI:
http://hdl.handle.net/10149/98944
DOI:
10.1016/j.cattod.2004.03.024
Abstract:
The interaction of oxygen with partially reduced vanadia-based catalysts was investigated by Temporal Analysis of Products (TAP) transient technique in order to determine the degree of reduction and its effect on the reoxidation process. The well-defined Eurocat catalyst EL10V1 was chosen as reference catalyst and, based on the results obtained by oxygen titration (oxygen adsorption capacity), its degree of reduction was determined at different reaction temperatures. The values were in good agreement with those obtained by propane titration. The reducibility increases by increasing the temperature. The degree of reduction of a new class of vanadium oxide catalysts, obtained by magnetron sputter deposition, was also determined and the values were compared with those obtained on EL10V1, when a number of propane molecules equivalent of a degree of reduction of 21% for EL10V1 was pulsed over all samples. For the sputtered catalysts, the oxygen uptake at 773 K decreased from 0.94 to 0.68 μmolO2/m2 with increasing deposition time from 1 to 5.5 h. The degree of reduction of another well-defined Eurocat catalyst, EL10V8, was also determined. At the same temperature the oxygen uptake increased from 0.18 μmolO2/m2 on EL10V8 to 1.17 μmolO 2/m2 on EL10V1. Reversible molecular adsorption of oxygen, followed by irreversible dissociation, allows to describe the single-response TAP data for EL10V1 and EL10V8. For the sputtered catalysts a one-stage irreversible dissociative adsorption of oxygen provides the best description of such single-response TAP data.
Type:
Article
Language:
en
Keywords:
adsorption capacity; degree of reduction; reaction kinetics; reduction; reoxidation; TAP; vanadia-based catalysts
ISSN:
0920-5861
Rights:
Author can archive post-print (ie final draft post-refereeing). For full details see http://www.sherpa.ac.uk/romeo/ [Accessed 17/05/2010]
Citation Count:
2 [Scopus, 17/05/2010]

Full metadata record

DC FieldValue Language
dc.contributor.authorSack, I. (Isabelle)en
dc.contributor.authorOlea, M. (Maria)en
dc.contributor.authorPoelman, H. (Hilde)en
dc.contributor.authorEufinger, K. (Karin)en
dc.contributor.authorde Gryse, R. (Roger)en
dc.contributor.authorMarin, G. B. (Guy)en
dc.date.accessioned2010-05-17T09:09:33Z-
dc.date.available2010-05-17T09:09:33Z-
dc.date.issued2004-07-15-
dc.identifier.citationCatalysis Today; 91-92:149-153en
dc.identifier.issn0920-5861-
dc.identifier.doi10.1016/j.cattod.2004.03.024-
dc.identifier.urihttp://hdl.handle.net/10149/98944-
dc.description.abstractThe interaction of oxygen with partially reduced vanadia-based catalysts was investigated by Temporal Analysis of Products (TAP) transient technique in order to determine the degree of reduction and its effect on the reoxidation process. The well-defined Eurocat catalyst EL10V1 was chosen as reference catalyst and, based on the results obtained by oxygen titration (oxygen adsorption capacity), its degree of reduction was determined at different reaction temperatures. The values were in good agreement with those obtained by propane titration. The reducibility increases by increasing the temperature. The degree of reduction of a new class of vanadium oxide catalysts, obtained by magnetron sputter deposition, was also determined and the values were compared with those obtained on EL10V1, when a number of propane molecules equivalent of a degree of reduction of 21% for EL10V1 was pulsed over all samples. For the sputtered catalysts, the oxygen uptake at 773 K decreased from 0.94 to 0.68 μmolO2/m2 with increasing deposition time from 1 to 5.5 h. The degree of reduction of another well-defined Eurocat catalyst, EL10V8, was also determined. At the same temperature the oxygen uptake increased from 0.18 μmolO2/m2 on EL10V8 to 1.17 μmolO 2/m2 on EL10V1. Reversible molecular adsorption of oxygen, followed by irreversible dissociation, allows to describe the single-response TAP data for EL10V1 and EL10V8. For the sputtered catalysts a one-stage irreversible dissociative adsorption of oxygen provides the best description of such single-response TAP data.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 17/05/2010]en
dc.subjectadsorption capacityen
dc.subjectdegree of reductionen
dc.subjectreaction kineticsen
dc.subjectreductionen
dc.subjectreoxidationen
dc.subjectTAPen
dc.subjectvanadia-based catalystsen
dc.titleTAP studies on the reoxidation of some partially reduced vanadia-based catalystsen
dc.typeArticleen
dc.contributor.departmentGhent University. Department of Chemical Engineering. Laboratorium voor Petrochemische Techniek.en
dc.identifier.journalCatalysis Todayen
ref.citationcount2 [Scopus, 17/05/2010]en
or.citation.harvardSack, I. et. al. (2004) 'TAP studies on the reoxidation of some partially reduced vanadia-based catalysts', Catalysis Today, 91-92, pp.149-153.-
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