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Tailoring the properties of hierarchical TS-1 zeolite synthesized from silanized protozeolitic units

dc.contributor.authorSerrano, D. P.
dc.contributor.authorSanz, R.
dc.contributor.authorPizarro, P.
dc.contributor.authorMoreno, I.
dc.contributor.editorELSEVIERes
dc.date.accessioned2012-09-06T09:35:51Z
dc.date.available2012-09-06T09:35:51Z
dc.date.issued2012
dc.identifier.citationTailoring the properties of hierarchical TS-1 zeolite synthesized from silanized protozeolitic units. D. P. Serrano, R. Sanz, P. Pizarro, I. Moreno. Applied Catalysis A: General 435-436 (2012) 32-42.es
dc.identifier.urihttp://hdl.handle.net/10115/8119
dc.descriptionLínea Investigación: 10. Diseño de nuevos catalizadores heterogéneos en procesos químicos de interés industriales
dc.description.abstractHierarchical TS-1 zeolites, characterized by having a secondary porosity within the supermicro/mesopore region (1.5-6 nm), have been synthesized following a procedure based on the silanization of protozeolitic units, which are previously generated by means of a precrystallization step. The silanization agent, phenylaminopropyltrimethoxysilane (PHAPTMS) acts as crystal growth inhibitor, hindering partially the protozeolitic units growth and aggregation during the crystallization treatment. Both the duration of the precrystallization step and the proportion of the organosilane compound added to the synthesis gel have a significant influence on the physicochemical and textural properties of the resultant materials. Thus, the best precrystallization time, leading to the most enhanced textural properties, is comprised between 22-24 hours. Using this time an appropriate balance between the number of protozeolitic units formed and their size is reached. On the other hand, by controlling the organosilane compound proportion added to synthesis gel, the contribution of the secondary porosity can be tailored. Likewise, amounts of organosilane larger than 5 mol% provide to a secondary porous system more uniform in size. The catalytic activity of these materials was evaluated in 1-octene and cyclohexene epoxidation reactions, using tert-butylhydroperoxide (TBHP) as oxidant. The olefin conversion and TOF values reached by hierarchical TS-1 zeolites are remarkably superior to that obtained with the conventional microporous TS-1 zeolite, being higher when the modification degree of the textural properties is more pronounced. These results can be ascribed to the higher accessibility of both TBHP and olefin to the titanium active sites located in the secondary porous system. Likewise, these zeolites exhibit a high oxidant efficiency and total selectivity to epoxide, parameters which are not affected by the presence of the secondary porosity.es
dc.language.isoenges
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subjectQuímicaes
dc.subjectTS-1 zeolitees
dc.subjecthierarchical porosityes
dc.subjectsilanizationes
dc.subjectepoxidationes
dc.titleTailoring the properties of hierarchical TS-1 zeolite synthesized from silanized protozeolitic unitses
dc.typeinfo:eu-repo/semantics/articlees
dc.identifier.doi10.1016/j.apcata.2012.05.033es
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.subject.unesco23 Químicaes
dc.description.departamentoTecnología Química y Energética


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Atribución-NoComercial-SinDerivadas 3.0 EspañaExcept where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 España