Characterization of the diffusion path in micro- and meso-porous materials from ZLC analysis

Authors: Huang, Qinglin1; Eić, Mladen2; Xiao, Huining1; Kaliaguine, Serge3

Source: Adsorption, Volume 16, Number 6, December 2010 , pp. 531-539(9)

Publisher: Springer

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It has been demonstrated that the main diffusion paths of micro- and meso-porous UL-zeolites could be characterized from the Zero Length Column (ZLC) desorption curves with an appropriate theoretical analysis (Malekian et al., in Ind. Eng. Chem. Res. 46:5067, 2007). The present work extends this method to study the ZLC desorption data of n-heptane/cumene/mesitylene in three mesoporous SBA-15 samples, 1-methylnaphthalene in MCM-48, cumene in SBA-16 and toluene/cumene in a microporous one-dimensional boron SSZ-42. The investigation results revealed that the structure of SBA-15, MCM-48 and SBA-16 behaved approximately as three-dimensional (isotropic) diffusion system, while SSZ-42 behaved as one-dimensional (anisotropic) diffusion systems. The diffusion path did not change within the measured temperature range, and by using different sorbate molecules. This work confirmed that this effective and relatively inexpensive method can be used as an additional tool for the characterization of porous materials.

Keywords: Diffusion path, ZLC technique; Micro- and meso-porous material

Document Type: Research Article


Affiliations: 1: Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada 2: Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada, Email: 3: Department of Chemical Engineering, Laval University, Québec, G1K 7P4, Canada

Publication date: December 1, 2010

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