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

Jagiello, J. ; Sterling, M. ; Eliášová, P. ; Opanasenko, M. ; Zukal, A. ; Morris, R. ; Navarro, M. ; Mayoral, A. ; Crivelli, P. ; Warringham, R. ; Mitchell, S. ; Perez-Ramirez, J. ; Cejka, J.

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)

Financiación: info:eu-repo/grantAgreement/EC/FP7/312483/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM 2

Tipo y forma: Artículo (PostPrint)