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Study of Pt/MCM-22 based catalysts in the transformation of n-hexane: effect of rare earth elements and mode of platinum introduction

2011-12Journal article Open access
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dc.contributor.authorMartins, Angela
dc.contributor.authorSilva, João
dc.contributor.authorRibeiro, Fernando Ramôa
dc.contributor.authorFilipa Ribeiro, M.
dc.date.accessioned2013-02-17T12:29:55Z
dc.date.available2013-02-17T12:29:55Z
dc.date.issued2011-12
dc.description.abstractThe bifunctional transformation of n-hexane was carried out over Pt/MCM-22 based catalysts. MCM-22 was synthesized and submitted to ion exchange with rare earth nitrate solutions of La, Nd and Yb, followed by Pt introduction. Three different methods were used to introduce about 1 wt% of Pt in the zeolite: ion exchange, incipient wetness impregnation and mechanical mixture with Pt/Al(2)O(3). The bifunctional catalysts were characterized by transmission electron microscopy and by the model reaction of toluene hydrogenation. These experiments showed that, in the ion exchanged sample, Pt is located both within the inner micropores and on the outer surface, whereas in the impregnated one, the metal is essentially located on the outer surface under the form of large particles. The presence of RE elements increases the hydrogenating activity of Pt/MCM-22 since the location of these species at the vicinity of metal particles causes modification on its electronic properties. Whatever the mode of Pt introduction, a fast initial decrease in conversion is observed for n-hexane transformation, followed by a plateau related to the occurrence of the catalytic transformations at the hemicages located at the outer surface of the crystals. The effect of rare earth elements on the hydrogenating function leads to a lower selectivity in dibranched isomers and increased amounts of light products.por
dc.identifier.citationMARTINS, Angela; SILVA, João M.; RIBEIRO, Fernando Ramôa; RIBEIRO, M. Filipa - Study of Pt/MCM-22 based catalysts in the transformation of n-hexane: effect of rare earth elements and mode of platinum introduction. Reaction Kinetics Mechanisms and Catalysis. ISSN 1878-5190. Vol. 104, n.º 2 (2011) p. 417-428.por
dc.identifier.issn1878-5190
dc.identifier.urihttp://hdl.handle.net/10400.21/2245
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherSpringerpor
dc.subjectMCM-22por
dc.subjectPlatinumpor
dc.subjectRare Earth Elementspor
dc.subjectBifunctional Catalystpor
dc.subjectn-Hexanepor
dc.subjectPore Systemspor
dc.subjectHydroisomerizationpor
dc.subjectZeolitespor
dc.subjectH-MCM-22por
dc.subjectAciditypor
dc.subjectHeptanepor
dc.subjectToluenepor
dc.titleStudy of Pt/MCM-22 based catalysts in the transformation of n-hexane: effect of rare earth elements and mode of platinum introductionpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceDordrechtpor
oaire.citation.endPage428por
oaire.citation.issue2por
oaire.citation.startPage417por
oaire.citation.titleReaction Kinetics Mechanisms and Catalysispor
oaire.citation.volume104por
person.familyNameSilva
person.givenNameJoão Miguel Alves da
person.identifierfWmw7kEAAAAJ
person.identifier.ciencia-id3D1F-BD3A-4A9D
person.identifier.orcid0000-0003-1244-6483
person.identifier.scopus-author-id16317291000
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication36449517-d0f7-4619-aae3-81af776b82fd
relation.isAuthorOfPublication.latestForDiscovery36449517-d0f7-4619-aae3-81af776b82fd

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