Determination of the percolation properties and pore connectivity for mesoporous solids using NMR cryodiffusometry

Emily L Perkins, John P Lowe, Karen J Edler, Nuradeen Tanko, Sean P Rigby

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Using a model disordered mesoporous solid with a spatial arrangement of pore sizes analogous to a macroscopic ink-bottle, the hysteresis obsd. in NMR cryoporometry can be deconvoluted into sep. single pore and pore-blocking contributions. The suggestion of pore-blocking effects was confirmed using PFG NMR. Hence, percolation theory was used, for the 1st time with cryoporometry, to analyze the pore-blocking contribution to the hysteresis to det. the accessibility function and pore connectivity of the void space of a mesoporous sol-gel SiO2 catalyst support pellet. NMR cryoporometry can be used to obtain a full range of void space descriptors, and thus offers a full, and potentially better understood, complementary pore structure characterization method to gas sorption and Hg porosimetry.
Original languageEnglish
Pages (from-to)1929-1940
Number of pages12
JournalChemical Engineering Science
Volume63
Issue number7
DOIs
Publication statusPublished - 2008

Keywords

  • Percolation
  • Mesoporous materials
  • Pore size
  • percolation pore connectivity mesoporous silica catalyst NMR cryodiffusometry
  • Pore structure (detn. of percolation properties and pore connectivity for mesoporous solids using NMR cryodiffusometry)
  • NMR

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