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Carbon supported iridium catalysts in the catalytic wet air oxidation of carboxylic acids: kinetics and mechanistic interpretation

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dc.contributor.authorGomes, Helder
dc.contributor.authorFigueiredo, José
dc.contributor.authorFaria, Joaquim
dc.contributor.authorSerp, Philippe
dc.contributor.authorKalck, Philippe
dc.date.accessioned2010-01-20T17:59:38Z
dc.date.available2010-01-20T17:59:38Z
dc.date.issued2002
dc.description.abstractCarbon-supported iridium catalysts were prepared by different incipient wetness impregnation methods and by organometallic chemical vapor deposition. The catalysts were characterized by N2 adsorption, TPD, SEM and H2 chemisorption measurements. The results obtained indicate a clear dependency of the metal-phase dispersion on the pre-treatment of the carbon support and the impregnation method. Their activity for catalytic wet air oxidation of butyric and iso-butyric acid aqueous solutions was investigated in a stirred reactor at 473K and 0.69MPa of oxygen partial pressure. The conversions obtained after 2 h were 43 and 52%,with respect to each carboxylic acid, when the most active catalysts were used. The measured conversions and initial reaction rates correlate well with the exposed metal area. A rate equation was determined from measurements of the initial reaction rates at different oxygen partial pressures, temperatures and catalyst mass loads. The results were modeled considering a heterogeneously catalyzed free-radical mechanism.pt
dc.identifier.citationGomes, Helder; Figueiredo, José; Faria, Joaquim; Serp, Philippe; Kalck, Philippe (2002). Carbon supported iridium catalysts in the catalytic wet air oxidation of carboxylic acids: kinetics and mechanistic interpretation. Journal of Molecular Catalysis A: Chemical. ISSN 1381-1169. 182:1 Special Issue: SI, p. 47-60pt
dc.identifier.doi10.1016/S1381-1169(01)00475-7
dc.identifier.issn1381-1169
dc.identifier.urihttp://hdl.handle.net/10198/1359
dc.language.isoengpt
dc.publisherElsevierpt
dc.subjectCatalytic wet air oxidationpt
dc.subjectCarbon-supported iridium catalystspt
dc.subjectIncipient wetness impregnationpt
dc.subjectOrganometallic chemical vapor depositionpt
dc.subjectHeterogeneous-catalyzed free-radical mechanismpt
dc.titleCarbon supported iridium catalysts in the catalytic wet air oxidation of carboxylic acids: kinetics and mechanistic interpretationpt
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage60pt
oaire.citation.startPage47pt
oaire.citation.titleJournal of Molecular Catalysis A: Chemicalpt
person.familyNameGomes
person.givenNameHelder T.
person.identifier.ciencia-id6218-1E19-13EE
person.identifier.orcid0000-0001-6898-2408
rcaap.rightsrestrictedAccesspt
rcaap.typearticlept
relation.isAuthorOfPublication0eb96337-224a-4339-9918-334436fbbb99
relation.isAuthorOfPublication.latestForDiscovery0eb96337-224a-4339-9918-334436fbbb99

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