University of Twente Student Theses


Influence of water vapor on silica membranes: Effect of sorption and percolation

Song, Chunlin (2005) Influence of water vapor on silica membranes: Effect of sorption and percolation.

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Abstract:Silica-based membranes are considered to be promising means of hydrogen separation at elevated temperatures due to their high H2 permeance, very good selectivity and relative ease to scale up. This is especially relevant for their applications in coal gasification and steam reforming where water vapor is present. The membranes studied here are composed of three layers: macroporous α-Al2O3 as the support, mesoporous γ-Al2O 3 as the intermediate layer and microporous amorphous silica as the separation layer. In this report, the influence of water vapor on He transport through silica membrane has been investigated in terms of adsorption and percolation effect at relatively low temperatures (i.e. 50 and 90°C). The selected temperatures maximize the difference of mobility between He and H2O molecules and avoid the structural change. He is considered to be a mobile component, while H2O is an immobile one when these two gases transported under the specified conditions.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:35 chemistry
Programme:Chemical Engineering MSc (60437)
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