Pore size and surface chemistry effects on the transport of hydrophobic and hydrophilic solvents through mesoporous y-alumina and silica MCM-48

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Roy Chowdhury, Sankhanilay and Schmuhl, Riaan and Keizer, Klaas and Elshof, Johan E. ten and Blank, Dave H.A. (2003) Pore size and surface chemistry effects on the transport of hydrophobic and hydrophilic solvents through mesoporous y-alumina and silica MCM-48. Journal of Membrane Science, 225 (1-2). pp. 177-186. ISSN 0376-7388

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Abstract:The structural and solvent transport properties of supported mesoporous γ-alumina and MCM-type silica membranes are reported. Templated mesoporous silica layers and powders were characterized by XRD, permporometry, XPS and BET measurements. The results indicate that the γ-alumina membrane is 1 μm thick, while the silica membrane is 30 nm thick, has a pore size of 2.8–3.4 nm and possesses the MCM-48 structure. Pressure-driven solvent flow experiments on -alumina supported γ-alumina and MCM-48 membranes indicate that the permeabilities of the mesoporous layers depend on the chemical nature of the solvents. The permeability of hexane and toluene through γ-alumina with 4.5–7.5 nm pores is lower than that of hydrophilic alcohols and water. The permeability of water and alcohols through MCM-48 appears to be affected by solvent–pore interactions on molecular scale. The MCM-48 layer has a higher permeability than γ-alumina, which can be attributed to its much smaller thickness.
Item Type:Article
Copyright:© 2003 Elsevier
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/40617
Official URL:http://dx.doi.org/10.1016/j.memsci.2003.07.018
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Metis ID: 212955