H sub(2) Purification Durability of Dimethoxydiphenylsilane-Derived Silica Membranes with H sub(2)-Toluene Mixtures

Long-term durability tests of dimethoxydiphenylsilane-derived silica membranes for purifying H sub(2) from H sub(2)-toluene mixtures were carried out. The silica membrane maintained excellent H sub(2)-selective performance under H sub(2)-toluene mixture condition, despite H sub(2) permeance was decr...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2013-12, Vol.52 (48), p.17257-17262-17257-17262
Main Authors: Seshimo, Masahiro, Akamatsu, Kazuki, Furuta, Satoshi, Nakao, Shin-ichi
Format: Article
Language:English
Subjects:
Dissolution
Durability
Membranes
Placing
Purification
Silicon dioxide
Surface chemistry
Toluene
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Summary:Long-term durability tests of dimethoxydiphenylsilane-derived silica membranes for purifying H sub(2) from H sub(2)-toluene mixtures were carried out. The silica membrane maintained excellent H sub(2)-selective performance under H sub(2)-toluene mixture condition, despite H sub(2) permeance was decreased from its initial value. Membrane performance changed in two steps. Performance initially decreased rapidly, and then decreased very slowly. We also examined membrane performance using H sub(2)-dehydrated toluene and H sub(2)-water mixtures, and it was indicated that adsorption of toluene molecules and water molecules dissolved in toluene on membrane surfaces was the predominant factor for the rapid initial decrease. Water molecules present within toluene also affected the subsequent slower decrease. These decrements were partially recovered by placing the membranes in an H sub(2) stream. Incomplete recovery during regeneration was due to the strong effect of water molecules dissolved in toluene, even though the amount of water was quite small.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie4024512