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Structural analysis of IPC zeolites and related materials using positron annihilation spectroscopy and high-resolution argon adsorption
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SYSNO ASEP 0461874 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Structural analysis of IPC zeolites and related materials using positron annihilation spectroscopy and high-resolution argon adsorption Author(s) Jagiello, J. (US)
Sterling, N.C. (US)
Eliášová, Pavla (UFCH-W) RID
Opanasenko, Maksym (UFCH-W) RID, ORCID
Zukal, Arnošt (UFCH-W) RID
Morris, R. E. (GB)
Navaro, M. (GB)
Mayoral, A. (ES)
Crivelli, P. (CH)
Warringham, R. (CH)
Mitchell, S. (CH)
Pérez-Ramirez, J. (CH)
Čejka, Jiří (UFCH-W) RID, ORCID, SAISource Title Physical Chemistry Chemical Physics. - : Royal Society of Chemistry - ISSN 1463-9076
Roč. 18, MAY 2016 (2016), s. 15269-15277Number of pages 9 s. Language eng - English Country GB - United Kingdom Keywords PORE-SIZE ; POROUS MATERIALS ; LIFETIME SPECTROSCOPY Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GAP106/12/0189 GA ČR - Czech Science Foundation (CSF) Institutional support UFCH-W - RVO:61388955 UT WOS 000378273500059 EID SCOPUS 84973665430 DOI 10.1039/c6cp01950a Annotation The advanced investigation of pore networks in isoreticular zeolites and mesoporous materials related to the IPC family was performed using high-resolution argon adsorption experiments coupled with the development of a state-of-the-art non-local density functional theory approach. The optimization of a kernel for model sorption isotherms for materials possessing the same layer structure, differing only in the interlayer connectivity (e.g. oxygen bridges, single- or double-four-ring building units, mesoscale pillars etc.) revealed remarkable differences in their porous systems. Using high-resolution adsorption data, the bimodal pore size distribution consistent with crystallographic data for IPC-6, IPC-7 and UTL samples is shown for the first time. A dynamic assessment by positron annihilation lifetime spectroscopy (PALS) provided complementary insights, simply distinguishing the enhanced accessibility of the pore network in samples incorporating mesoscale pillars and revealing the presence of a certain fraction of micropores undetected by gas sorption. Nonetheless, subtle differences in the pore size could not be discriminated based on the widely-applied Tao–Eldrup model. The combination of both methods can be useful for the advanced characterization of microporous, mesoporous and hierarchical materials. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2017
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