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Structural analysis of IPC zeolites and related materials using positron annihilation spectroscopy and high-resolution argon adsorption

  1. 1. 0461874 - UFCH-W 2017 RIV GB eng J - Článek v odborném periodiku
    Jagiello, J. - Sterling, N.C. - Eliášová, Pavla - Opanasenko, Maksym - Zukal, Arnošt - Morris, R. E. - Navaro, M. - Mayoral, A. - Crivelli, P. - Warringham, R. - Mitchell, S. - Pérez-Ramirez, J. - Čejka, Jiří
    Structural analysis of IPC zeolites and related materials using positron annihilation spectroscopy and high-resolution argon adsorption.
    Physical Chemistry Chemical Physics. Roč. 18, MAY 2016 (2016), s. 15269-15277 ISSN 1463-9076
    Grant CEP: GA ČR(CZ) GAP106/12/0189
    GRANT EU: European Commission(XE) 604307 - CASCATBEL
    Institucionální podpora: RVO:61388955
    Klíčová slova: PORE-SIZE * POROUS MATERIALS * LIFETIME SPECTROSCOPY
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 4.123, rok: 2016

    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.
    Trvalý link: http://hdl.handle.net/11104/0261437
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