Hostname: page-component-586b7cd67f-rdxmf Total loading time: 0 Render date: 2024-11-25T15:44:12.759Z Has data issue: false hasContentIssue false
  • English
  • Français

Gas Permeation Characteristics and Stability of Composite Silica-Metal Oxide Membranes

Published online by Cambridge University Press:  11 February 2011

Masashi Asaeda ,
Masakoto Kanezashi ,
Tomohisa Yoshioka  and
Toshinori Tsuru
Masashi Asaeda
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering Hiroshima University, Higashi-Hiroshima, 739–8527, Japan
Masakoto Kanezashi
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering Hiroshima University, Higashi-Hiroshima, 739–8527, Japan
Tomohisa Yoshioka
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering Hiroshima University, Higashi-Hiroshima, 739–8527, Japan
Toshinori Tsuru
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering Hiroshima University, Higashi-Hiroshima, 739–8527, Japan
Get access

Abstract

In order to improve the stability of silica membranes against water (vapor) some metal oxides were added to silica to obtain composite silica-metal oxide membranes by the sol-gel techniques. A Ni-doped silica membrane (Ni/Si=1/2) fired at 500°C showed a relatively large permeance of 1.5×10−5 [m3(STP)/(m2skPa)] with selectivity of 350 (H2/CH4), 4200 (H2/SF6) at 200°C and 100 (CO2/CH4) at 35 °C. After leaving the membrane in humid air (RH: 60%, 40°C) for 70 days, the permeance of H2 decreased by about 50% but the selectivity was improved to 930 for H2/CH4. And little change was observed in the activation energy for H2 permeation, while under the same conditions a silica membrane showed a quite large change in the activation energy from 3.1kJ/mol to 14kJ/mol. There is a possibility that metal oxides added to silica help prevent the densification of silica networks through which hydrogen and helium molecules can permeate.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 752: Symposium AA – Membranes–Preparation, Properties and Applications , 2002 , AA10.3
Copyright
Copyright © Materials Research Society 2003

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Asaeda, M., Yamamichi, A., Satoh, M. and Kamakura, M., “Preparation of porous silica membranes for separation of propylene/propane gaseous mixtures,” Proceedings of the third International Conference on Inorganic Membranes, 315(1994)Google Scholar
2. Gavalas, G. R., Megilis, C. E., S., and Nam, W., “Deposition of H2-permmselective SiO” films,” Chem. Eng. Sci. 44, 1829(1989)Google Scholar
3. Kitao, S., Kameda, H. and Asaeda, M., “Gas separation by thin porous silica membrane of ultra fine pores at high temperature,” MAKU(MEMBRANE) 14, 222(1990)Google Scholar
4. Tsapatsis, M., Gavalas, G. R., “Structure and aging characteristics of H2-permselective SiO2-Vycor membranes,” J. Memb. Sci. 87, 281(1994)Google Scholar
5. Asaeda, M. and Yamasaki, S., “Separation of inorganic/organic gas mixtures by porous silica membranes,” Separation and Purification Technology 25, 151(2001)Google Scholar
6. Asaeda, M., Yang, J. and Sakou, Y., “Porous Silica-Zirconia(50%) Membranes for Pervaporation of iso-Propyl Alcohol(IPA)/Water Mixtures,” J. Chem. Eng. Japan 35, 365(2002)Google Scholar
7. Asaeda, M., Sakou, Y., Yang, J. and Shimasaki, K., “Stability and performance of porous silica-zirconia composite membranes for pervaporation of aqueous organic solutions,” J. Memb. Sci. 209, 163(2002)Google Scholar
8. Asaeda, M., Okazaki, K. and Nakatani, A.,”Preparation of thin porous silica membranes for separation of non-aqueous organic solvent mixtures by pervaporation,” Ceramic Transactions 31, 411(1992)Google Scholar
9. Yoshioka, T., Nakanishi, E., Tsuru, T., and Asaeda, M., “Experimental study of gas permeation through microporous silica membranes,” AIChE Journal 47, 2052(2001)Google Scholar