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Hierarchical ZSM-5 zeolites synthesized by silanization of protozeolitic units: mediating the mesoporosity contribution by changing the organosilane type

dc.contributor.authorSerrano, D. P.
dc.contributor.authorPinnavaia, T. J.
dc.contributor.authorAguado, J.
dc.contributor.authorEscola, J. M.
dc.contributor.authorPeral, A.
dc.contributor.authorVillalba, L.
dc.date.accessioned2014-03-05T16:53:03Z
dc.date.available2014-03-05T16:53:03Z
dc.date.issued2014
dc.identifier.citationD. P. Serrano, T. J. Pinnavaia, J. Aguado, J. M. Escola, A. Peral, L. Villalba. Hierarchical ZSM-5 zeolites synthesized by silanization of protozeolitic units: mediating the mesoporosity contribution by changing the organosilane type. Catalysis Today, 227 (2014) 15-25es
dc.identifier.issn0920-5861
dc.identifier.urihttp://hdl.handle.net/10115/12124
dc.descriptionLínea 10. Diseño de nuevos catalizadores heterogéneos en procesos químicos de interés industriales
dc.description.abstractHierarchical ZSM-5 zeolites were prepared by crystallization of silanized protozeolitic units employing silylated polypropylene oxide diamine polymers as organosilanes. The influence of the (Sipol/ Sigel) molar ratio was investigated within 0 - 0.15 range. High synthesis yields (~90%) of well-crystallized hierarchical zeolites exhibiting a high proportion of secondary porosity (additional to the zeolitic micropores) was reached for (Sipol/Sigel) molar ratios lower than 0.08. The usage of the silylated polymer resulted in hierarchical ZSM-5 with larger mesopores (4-20 nm) in higher share than the hierarchical ZSM-5 prepared with a smaller organosilane (phenyl-aminopropyl-trimethoxysilane, PHAPTMS). However, it also contained meaningfully lower amount of acid sites and with less acid strength. The best catalytic performance in the cracking of low density polyethylene (LDPE) was showed by the material prepared from a (Sipol/Sigel) ratio of 0.03. Noteworthy, in addition to the gasoline range fraction (C6-C12), light C1-C5 olefins are the main reaction products, which are interesting feedstock for the petrochemical industry. Its catalytic performance is similar to the hierarchical ZSM-5 prepared using the smaller organosilane (PHAPTMS), which is indicative that the enhanced accessibility to the acid sites due to the presence of larger mesopores (4-20 nm) makes up for the lower amount and strength of its acid sites. Thereby, it is possible to enhance the mesoporosity by using bulkier organosilane (silylated polymers) but at the expense of losing acid properties.es
dc.language.isoenges
dc.publisherElsevieres
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subjectQuímicaes
dc.subjecthierarchical porosityes
dc.subjectZSM-5es
dc.subjectsilanizationes
dc.subjectsilylated polymeres
dc.subjectPHAPTMSes
dc.titleHierarchical ZSM-5 zeolites synthesized by silanization of protozeolitic units: mediating the mesoporosity contribution by changing the organosilane typees
dc.typeinfo:eu-repo/semantics/articlees
dc.identifier.doi10.1016/j.cattod.2013.10.052es
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.subject.unesco3303.03 Procesos Químicoses
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