Oxidative regeneration of toluene-saturated natural zeolite by gaseous ozone: The influence of zeolite chemical surface characteristics

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datacite.alternateIdentifier.citationJournal of Hazardous Materials, 274, 220-212, 2014
datacite.alternateIdentifier.doi10.1016/j.jhazmat.2014.04.006
datacite.alternateIdentifier.issn0304-3894
datacite.creatorAlejandro, Serguei
datacite.creatorValdes, Hector
datacite.creatorManero, Marie-Helene
datacite.creatorZaror, Claudio A.
datacite.date2014
datacite.rightsRegistro bibliográfico
datacite.subjectBronsted acid sites
datacite.subjectLewis acid sites
datacite.subjectOzone
datacite.subjectToluene
datacite.subjectZeolite
datacite.titleOxidative regeneration of toluene-saturated natural zeolite by gaseous ozone: The influence of zeolite chemical surface characteristics
dc.description.abstractIn this study, the effect of zeolite chemical surface characteristics on the oxidative regeneration of toluene saturated-zeolite samples is investigated. A Chilean natural zeolite (53% clinoptilolite, 40% mordenite and 7% quartz) was chemically modified by acid treatment with hydrochloric acid and by ion-exchange with ammonium sulphate. Thermal pre-treatments at 623 and 823 K were applied and six zeolite samples with different chemical surface characteristics were generated. Chemical modification of natural zeolite followed by thermal out-gassing allows distinguishing the role of acidic surface sites on the regeneration of exhausted zeolites. An increase in Bronsted acid sites on zeolite surface is observed as a result of ammonium-exchange treatment followed by thermal treatment at 623 K, thus increasing the adsorption capacity toward toluene. High ozone consumption could be associated to a high content of Lewis acid sites, since these could decompose ozone into atomic active oxygen species. Then, surface oxidation reactions could take part among adsorbed toluene at Bronsted acid sites and surface atomic oxygen species, reducing the amount of adsorbed toluene after the regenerative oxidation with ozone. Experimental results show that the presence of adsorbed oxidation by-products has a negative impact on the recovery of zeolite adsorption capacity. (C) 2014 Elsevier B.V. All rights reserved.
dc.description.ia_keywordzeolite, surface, toluene, acid, chemical, sites, ozone
dc.identifier.issn1873-3336
dc.identifier.urihttps://repositoriodigital.uct.cl/handle/10925/4024
dc.language.isoen
dc.publisherElsevier BV
dc.relationinstname: ANID
dc.relationreponame: Repositorio Digital RI2.0
dc.rights.driverinfo:eu-repo/semantics/openAccess
dc.sourceJournal of Hazardous Materials
dc.subject.ia_odsODS 12: Producción y consumo responsables
dc.subject.ia_oecd1nCiencias Naturales
dc.subject.ia_oecd2nCiencias Biológicas
dc.subject.ia_oecd3nEcología
dc.type.driverinfo:eu-repo/semantics/article
dc.type.driverhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.type.openaireinfo:eu-repo/semantics/publishedVersion
dspace.entity.typePublication
oaire.citationEdition2014
oaire.citationEndPage220
oaire.citationStartPage212
oaire.citationTitleJournal of Hazardous Materials
oaire.citationVolume274
oaire.fundingReferenceCONICYT ANID FONDECYT 1130560 (Regular)
oaire.fundingReferenceANR ANR-10-ECOT-011-01
oaire.fundingReferenceECOS-CONICYT C11E08
oaire.fundingReferenceCNRS Midi-Pyrénées 424948
oaire.fundingReferenceANID BASAL PFB-27
oaire.licenseConditionCopyright © Elsevier B.V, 2014
oaire.resourceTypeArtículo
oaire.resourceType.enArticle
uct.catalogadorjvu
uct.comunidadIngenieríaen_US
uct.facultadFacultad de Ingeniería
uct.indizacionScience Citation Index Expanded - SCIE
uct.indizacionScopus
uct.indizacionEi Compendex
uct.indizacionPubMed
uct.indizacionEMBASE
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