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

J. Jagiello, M. Sterling, P. Eliášová, M. Opanasenko, A. Zukal, R. E. Morris, M. Navaro, A. Mayoral, P. Crivelli, R. Warringham, S. Mitchell, J. Pérez-Ramírez, J. Čejka

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)15269-15277
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number22
Early online date16 May 2016
DOIs
Publication statusPublished - 14 Jun 2016

Keywords

  • IPC zeolites
  • Positron annihilation spectroscopy
  • Pore size distribution
  • High-resolution absorption
  • ADOR

Fingerprint

Dive into the research topics of 'Structural analysis of IPC zeolites and related materials using positron annihilation spectroscopy and high-resolution argon adsorption'. Together they form a unique fingerprint.

Cite this