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Porosity and accessibility of acid sites in desilicated ZSM-5 zeolites studied using adsorption of probe molecules

Porosity and accessibility of acid sites in desilicated ...

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dc.contributor.author Mlekodaj, Kinga [SAP14005639] pl
dc.contributor.author Tarach, Karolina [SAP14004719] pl
dc.contributor.author Datka, Jerzy [SAP11003748] pl
dc.contributor.author Góra-Marek, Kinga [SAP11018751] pl
dc.contributor.author Makowski, Wacław [SAP11013201] pl
dc.date.accessioned 2015-01-26T13:02:53Z
dc.date.available 2015-01-26T13:02:53Z
dc.date.issued 2014 pl
dc.identifier.issn 1387-1811 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/2748
dc.language eng pl
dc.rights Dodaję tylko opis bibliograficzny *
dc.rights.uri *
dc.title Porosity and accessibility of acid sites in desilicated ZSM-5 zeolites studied using adsorption of probe molecules pl
dc.type JournalArticle pl
dc.description.physical 54-61 pl
dc.abstract.en Porosity of zeolites ZSM-5 (Si/Al = 32 or 164) desilicated with NaOH or NaOH/TBAOH (tetrabutylammonium hydroxide) solutions was studied by means of quasi-equilibrated temperature programmed desorption and adsorption (QE-TPDA) of selected hydrocarbons. QE-TPDA of n-nonane confirmed substantial formation of mesopores upon desilication, observed also in N2 adsorption/ desorption isotherms. Very narrow mesopore size distributions with maxima at about 4 nm, typical for partially constricted mesopore networks, were obtained for all desilicated zeolites. It was also observed that desilication with NaOH/TBAOH results in formation of additional slightly larger mesopores (ca. 4-6 nm) while even larger mesopores (6-10 nm) were found after leaching with NaOH only. Thermodesorption of n-hexane revealed that the micropores in the desilicated zeolites remained unchanged. Acidity of the zeolites was characterized by quantitative IR measurements of pyridine and collidine (2,4,6-trimethylpyridine) adsorbed on acid sites. Increased numbers of Brønsted acid sites accessible for large collidine molecules found for the modified zeolites indicate that during desilication redistribution of the framework Al atoms to the surface of mesopores occurred. The influence of TBAOH presence in desilicating mixture on porosity and accessibility of the acid sites was also discussed. pl
dc.subject.en thermodesorption of hydrocarbons pl
dc.subject.en desilicated zeolite ZSM-5 pl
dc.subject.en micropores pl
dc.subject.en mesopores pl
dc.subject.en hierarchical materials pl
dc.description.volume 183 pl
dc.identifier.doi 10.1016/j.micromeso.2013.08.051 pl
dc.identifier.eissn 1873-3093 pl
dc.title.journal Microporous and Mesoporous Materials pl
dc.language.container eng pl
dc.affiliation Wydział Chemii : Zakład Chemii Nieorganicznej pl
dc.affiliation Wydział Chemii : Pracownia Spektrometrii w Podczerwieni pl
dc.subtype Article pl
dc.rights.original bez licencji pl
.pointsMNiSW [2014 A]: 35

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