A comparative study of glycerol dehydration catalyzed by micro/mesoporous MFI zeolites

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorPossato, Luiz Gustavo
dc.creatorDiniz, Rosiane N.
dc.creatorGaretto, Teresita
dc.creatorPulcinelli, Sandra Helena
dc.creatorSantilli, Celso Valentim
dc.creatorMartins, Leandro
dc.date2014-05-27T11:28:45Z
dc.date2016-10-25T18:46:01Z
dc.date2014-05-27T11:28:45Z
dc.date2016-10-25T18:46:01Z
dc.date2013-04-01
dc.date.accessioned2017-04-06T02:18:06Z
dc.date.available2017-04-06T02:18:06Z
dc.identifierJournal of Catalysis, v. 300, p. 102-112.
dc.identifier0021-9517
dc.identifier1090-2694
dc.identifierhttp://hdl.handle.net/11449/74926
dc.identifierhttp://acervodigital.unesp.br/handle/11449/74926
dc.identifier10.1016/j.jcat.2013.01.003
dc.identifierWOS:000317558000012
dc.identifier2-s2.0-84874830660
dc.identifierhttp://dx.doi.org/10.1016/j.jcat.2013.01.003
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/895685
dc.descriptionThe 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.
dc.languageeng
dc.relationJournal of Catalysis
dc.rightsinfo:eu-repo/semantics/closedAccess
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 zeolites
dc.typeOtro


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