4.6 Article

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

Journal

CHEMICAL ENGINEERING SCIENCE
Volume 63, Issue 7, Pages 1929-1940

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2007.12.022

Keywords

catalyst support; phase change; porous media; voidage; NMR cryoporometry; PFG NMR

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Using a model disordered mesoporous solid with a spatial arrangement of pore sizes analogous to a macroscopic 'ink-bottle', it has been shown that the hysteresis observed in NMR cryoporometry can be deconvoluted into separate single pore and pore-blocking contributions. The suggestion of pore-blocking effects has been confirmed using PFG NMR. Hence, percolation theory has been used, for the first time with cryoporometry, to analyse the pore-blocking contribution to the hysteresis to determine the accessibility function and pore connectivity of the void space of a mesoporous sol-gel silica catalyst support pellet. This work demonstrates that 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 characterisation method to gas sorption and mercury porosimetry. (C) 2008 Elsevier Ltd. All rights reserved.

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