Home > Articles > Structural analysis of IPC zeolites and related materials using positron annihilation spectroscopy and high-resolution argon adsorption
Resumen: The advanced investigation of pore networks of 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-linear 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. Idioma: Inglés DOI: 10.1039/C6CP01950A Año: 2016 Publicado en: Physical chemistry chemical physics. 18 (2016), 15269-15277 ISSN: 1463-9076 Factor impacto JCR: 4.123 (2016) Categ. JCR: PHYSICS, ATOMIC, MOLECULAR & CHEMICAL rank: 6 / 35 = 0.171 (2016) - Q1 - T1 Categ. JCR: CHEMISTRY, PHYSICAL rank: 38 / 145 = 0.262 (2016) - Q2 - T1 Factor impacto SCIMAGO: 1.685 - Physics and Astronomy (miscellaneous) (Q1) - Physical and Theoretical Chemistry (Q1)