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Catalytic behavior of alkali-treated Pt/HMOR n-hexane hydroisomerization

dc.contributor.authorMonteiro, R.
dc.contributor.authorAnia, Conchi O.
dc.contributor.authorRocha, J.
dc.contributor.authorCarvalho, A. P.
dc.contributor.authorMartins, Ângela Maria Pereira
dc.date.accessioned2015-08-24T10:14:29Z
dc.date.available2015-08-24T10:14:29Z
dc.date.issued2014-04-22
dc.description.abstractBifunctional Pt-HMOR catalysts were prepared by incipient wetness impregnation of various desilicated MOR obtained by alkaline treatment using NaOH concentrations ranging from 0.1 to 0.5 M. The zeolite structural changes upon modification were investigated by several techniques including powder X-ray diffraction,Al-27 and Si-29 MAS-NMR spectroscopy, N-2 adsorption, pyridine adsorption followed by infrared spectroscopy and the catalytic model reaction of m-xylene transformation. For low alkaline concentration the zeolite acidity is preserved, along with a slight increase of the volume correspondent to the larger micropores due to the removal of extra-framework debris already existent at the parent zeolite. At higher NaOH concentrations there is a significant loss of crystalinity and acidity as well as the formation of mesoporosity. The characterization of the metal function shows similar patterns for Pt-HMOR and Pt-M/0.1 samples, with Pt particles located mainly inside the inner porosity. In contrast, large Pt particles become visible at the intercrystalline mesoporosity of MOR crystals developed during the desilication treatments at severe alkaline conditions. The catalytic results obtained for n-hexane hydroisomerization showed an improved selectivity for dibranched over monobranched isomers for Pt-M/0.1 sample, likely due to the preservation of the support acidity and the slight enlargement of the micropores. This work is a new example in which the mesoporous development does not improve the catalytic efficiency of the zeolites, whereas mild alkaline desilication might be considered as an effective solution to produce customized catalysts with enhanced performance for a given application. (C) 2014 Elsevier B.V. All rights reserved.por
dc.identifier.citationMONTEIRO, R.; [et al] – Catalytic behavior of Alkali-Treated Pt/HMOR N-hexane hydroisomerization. Applied Catalysis A: General. ISSN: 0926-860X. Vol. 476 (2014), pp. 148-157por
dc.identifier.doi10.1016/j.apcata.2014.02.026
dc.identifier.issn0926-860X
dc.identifier.issn1873-3875
dc.identifier.urihttp://hdl.handle.net/10400.21/4924
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevier Science BVpor
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0926860X1400115X#
dc.subjectMORpor
dc.subjectDesilicationpor
dc.subjectBi-functional catalystspor
dc.subjectAciditypor
dc.subjectPlatinum, n-Hexane Hydroisomerizationpor
dc.titleCatalytic behavior of alkali-treated Pt/HMOR n-hexane hydroisomerizationpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceAmsterdampor
oaire.citation.endPage157por
oaire.citation.startPage148por
oaire.citation.titleApplied Catalysis A: Generalpor
oaire.citation.volume476por
rcaap.rightsclosedAccesspor
rcaap.typearticlepor

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