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Porosity in ion-exchanged and acid activated clays evaluated using n-nonane pre-adsorption

2016Journal article Open access
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dc.contributor.authorRibeiro Carrott, M.M.L.
dc.contributor.authorCansado, I.P.P.
dc.contributor.authorCarrott, P.J.M.
dc.contributor.authorRusso, P.A.
dc.contributor.authorCastilho, P.
dc.contributor.authorFernandes, C.
dc.contributor.authorCatrinescu, C.
dc.contributor.authorBreen, C.
dc.date.accessioned2021-03-29T11:18:05Z
dc.date.available2021-03-29T11:18:05Z
dc.date.issued2016
dc.description.abstractThe applicability of the n-nonane pre-adsorption method for characterising the porosity in clays is presented. Na-SD, a Naþ-exchanged purified bentonite, and materials obtained by Al3þ-exchange and acid treatments of Na-SD and SAz-1 were used. Nitrogen adsorption isotherms, at 196 C, were determined before and after n-nonane pre-adsorption on each of the samples. In all materials, n-nonane remained adsorbed in ultramicropores after outgassing at 25 C. Outgassing at higher temperatures (50, 75 and 200 C) removed nonane and ultramicropores became available for nitrogen adsorption. All treatments on Na-SD led to increase in micropore volume. Larger ultramicropore and supermicropore volumes were obtained for Na-SD acid activated with HCl at 95 C than for treatments at 25 C with HCl or following Al3þ-exchange (Al-SD), and increased with increasing acid concentration to 3 M. Activation with 4 M HCl led to the largest pore volume with contribution from mesopores. However, the specific external surface area was the same as that obtained for Na-SD, Al-SD and for most of the other acid activated samples. Treatments at 95 C with 1 M and 6 M HCl promoted increase in specific external surface area. The micropore volumes and specific external surface area for SAz-1 treated with 1 M HCl at 95 C were larger than those of Al-SAz-1, but lower than those obtained for corresponding materials derived from Na-SD. The n-nonane pre-adsorption method enabled micropore volumes and specific external surface areas to be obtained for all samples.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCarrott, M. R., Cansado, I. P. P., Carrott, P. J. M., Russo, P. A., Castilho, P., Fernandes, C., ... & Breen, C. (2016). Porosity in ion-exchanged and acid activated clays evaluated using n-nonane pre-adsorption. Microporous and Mesoporous Materials, 232, 238-247.pt_PT
dc.identifier.doi10.1016/j.micromeso.2016.06.030pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/3214
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherInternational Zeolite Associationpt_PT
dc.relationCLAYCATS4 - Clay catalysts for biomass conversion
dc.relationStrategic Project - UI 619 - 2014
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectClayspt_PT
dc.subjectn-Nonane pre-adsorptionpt_PT
dc.subjectMicroporositypt_PT
dc.subjectMesoporositypt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.subjectCentro de Química da Madeira
dc.titlePorosity in ion-exchanged and acid activated clays evaluated using n-nonane pre-adsorptionpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCLAYCATS4 - Clay catalysts for biomass conversion
oaire.awardTitleStrategic Project - UI 619 - 2014
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTM-CER%2F121295%2F2010/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/PEst-OE%2FQUI%2FUI0619%2F2014/PT
oaire.citation.endPage247pt_PT
oaire.citation.startPage238pt_PT
oaire.citation.titleMicroporous and Mesoporous Materialspt_PT
oaire.citation.volume232pt_PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameCastilho
person.familyNameFernandes
person.givenNamePaula C
person.givenNameCesar
person.identifierA-4412-2013
person.identifier.ciencia-id6D15-8C69-A2E0
person.identifier.orcid0000-0002-8303-4286
person.identifier.orcid0000-0001-9289-9962
person.identifier.scopus-author-id14064572200
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication482857a3-4e6d-4453-bfc1-afb17ff8ce2a
relation.isAuthorOfPublication.latestForDiscoveryd84fd917-438e-43bf-ac6f-256562481c05
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