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Influence of exchange cations on the catalytic conversion of limonene over Serra de Dentro (SD) and SAz-1 clays: correlations between acidity and catalytic activity/selectivity

2006Journal article Open access
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dc.contributor.authorCatrinescu, C.
dc.contributor.authorFernandes, César
dc.contributor.authorCastilho, P.
dc.contributor.authorBreen, C.
dc.date.accessioned2021-04-09T11:22:04Z
dc.date.available2021-04-09T11:22:04Z
dc.date.issued2006
dc.description.abstractA bentonite collected at Serra de Dentro (SD), Porto Santo Island, Portugal, and the source clay SAz-1 (Cheto, Arizona) were ion-exchanged with different cations (Al3+, Ni2+, Cr3+ and Na+ ). Variable temperature diffuse reflectance infrared Fourier transform spectroscopy (VT-DRIFTS) of pyridine treated samples, thermal desorption of cyclohexylamine and real time mass spectrometry of the evolved gases were used to evaluate the acidic properties of the prepared catalysts. The catalytic activity of these ion-exchanged clays was tested in the acid-catalysed conversion of limonene at 150 8C, to yield isomerization products (terpinolene, a-terpinene, g-terpinene and isoterpinolene), disproportionation products ( p cymene and p-menthenes) and high molecular-weight compounds. The possibility of increasing the selectivity toward p-cymene, over a catalyst with substantial Lewis acid character, was particularly envisaged. Catalysts derived from SD were significantly more active than their SAz-1 counterparts. This was mainly attributed to the greater inherent acidity, to the higher structural iron content (providing dehydrogenation activity) and to the higher nitrogen surface area of the starting SD clays. Within the Mn+ -SD series, the order of activity decreased as Ni2+ > Al3+ > Cr3+ > Na+ . A direct comparison between Al3+-SD (with maximized Bro¨nsted acidity) and Ni2+-SD (with predominant Lewis acid character) provided no support for enhanced p-cymene production over Lewis acid sites.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCatrinescu, C., Fernandes, C., Castilho, P., & Breen, C. (2006). Influence of exchange cations on the catalytic conversion of limonene over Serra de Dentro (SD) and SAz-1 clays: correlations between acidity and catalytic activity/selectivity. Applied Catalysis A: General, 311, 172-184.pt_PT
dc.identifier.doi10.1016/j.apcata.2006.06.023pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/3268
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationCLAYCATS - Modified Porto Santo Clays as catalysts for liquid phase organic reactions
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectIon-exchanged clayspt_PT
dc.subjectAciditypt_PT
dc.subjectCatalysispt_PT
dc.subjectLimonenept_PT
dc.subjectp-Cymenept_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleInfluence of exchange cations on the catalytic conversion of limonene over Serra de Dentro (SD) and SAz-1 clays: correlations between acidity and catalytic activity/selectivitypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCLAYCATS - Modified Porto Santo Clays as catalysts for liquid phase organic reactions
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI/POCTI%2FCTM%2F47619%2F2002/PT
oaire.citation.endPage184pt_PT
oaire.citation.startPage172pt_PT
oaire.citation.titleApplied Catalysis A: Generalpt_PT
oaire.citation.volume311pt_PT
oaire.fundingStreamPOCI
person.familyNameFernandes
person.familyNameCastilho
person.givenNameCesar
person.givenNamePaula C
person.identifierA-4412-2013
person.identifier.ciencia-id6D15-8C69-A2E0
person.identifier.orcid0000-0001-9289-9962
person.identifier.orcid0000-0002-8303-4286
person.identifier.scopus-author-id14064572200
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication482857a3-4e6d-4453-bfc1-afb17ff8ce2a
relation.isAuthorOfPublicationd84fd917-438e-43bf-ac6f-256562481c05
relation.isAuthorOfPublication.latestForDiscoveryd84fd917-438e-43bf-ac6f-256562481c05
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