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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/74926
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dc.contributor.authorPossato, Luiz Gustavo-
dc.contributor.authorDiniz, Rosiane N.-
dc.contributor.authorGaretto, Teresita-
dc.contributor.authorPulcinelli, Sandra Helena-
dc.contributor.authorSantilli, Celso Valentim-
dc.contributor.authorMartins, Leandro-
dc.date.accessioned2014-05-27T11:28:45Z-
dc.date.accessioned2016-10-25T18:46:01Z-
dc.date.available2014-05-27T11:28:45Z-
dc.date.available2016-10-25T18:46:01Z-
dc.date.issued2013-04-01-
dc.identifierhttp://dx.doi.org/10.1016/j.jcat.2013.01.003-
dc.identifier.citationJournal of Catalysis, v. 300, p. 102-112.-
dc.identifier.issn0021-9517-
dc.identifier.issn1090-2694-
dc.identifier.urihttp://hdl.handle.net/11449/74926-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/74926-
dc.description.abstractThe catalytic properties of monomodal microporous and bimodal micro-mesoporous zeolites were investigated in the gas-phase dehydration of glycerol. The desilication methodology used to produce the mesoporous zeolites minimized diffusion limitations and increased glycerol conversion in the catalytic reaction due to the hierarchical system of secondary pores created in the zeolite crystals. The chemical and structural properties of the catalyst were studied by X-ray diffraction, nitrogen adsorption-desorption isotherms, NH3-TPD and pyridine chemisorption followed by IR-spectroscopy. Although the aim was to desilicate to create mesoporosity in the zeolite crystals, the desilication promoted the formation of extra-framework aluminum species that affected the conversion of glycerol and the products distribution. The results clearly show that the mesoporous zeolites with designed mesopore structure allowed a rapid diffusion and consequently improved the reaction kinetics. However, especial attention must be given to the desilication procedure because the severity of the treatment negatively interfered on the Brønsted and Lewis acid sites relative concentration and, consequently, in the efficiency of the catalysis performed by these materials. On the other hand, during the catalytic reaction, the intracrystalline mesopores allowed carbonaceous compounds to be deposited herein, resulting in less blocked micropores and catalysts with higher long-term stability.en
dc.format.extent102-112-
dc.language.isoeng-
dc.sourceScopus-
dc.subjectAcrolein-
dc.subjectDeactivation-
dc.subjectGlycerol dehydration-
dc.subjectMesoporous materials-
dc.subjectZeolites-
dc.subjectCarbonaceous compounds-
dc.subjectExtra-framework aluminum species-
dc.subjectGlycerol dehydrations-
dc.subjectNitrogen adsorption-desorption-
dc.subjectProducts distributions-
dc.subjectRelative concentration-
dc.subjectCatalysis-
dc.subjectCatalysts-
dc.subjectDehydration-
dc.subjectHierarchical systems-
dc.subjectMicroporosity-
dc.subjectReaction kinetics-
dc.subjectX ray diffraction-
dc.subjectGlycerol-
dc.titleA comparative study of glycerol dehydration catalyzed by micro/mesoporous MFI zeolitesen
dc.typeoutro-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionINCAPE-Instituto de Investigaciones en Catálisis y Petroquímica-
dc.description.affiliationInstituto de Química UNESP-Univ Estadual Paulista, Prof. Francisco Degni 55, 14800-900 Araraquara, SP-
dc.description.affiliationINCAPE-Instituto de Investigaciones en Catálisis y Petroquímica, Santiago del Estero 2654, Santa Fe-
dc.description.affiliationUnespInstituto de Química UNESP-Univ Estadual Paulista, Prof. Francisco Degni 55, 14800-900 Araraquara, SP-
dc.identifier.doi10.1016/j.jcat.2013.01.003-
dc.identifier.wosWOS:000317558000012-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Catalysis-
dc.identifier.scopus2-s2.0-84874830660-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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