Preparation of Silica-Based Membrane for H2 Separation by Multi-Step Pore Modification
Because inorganic membranes have an excellent chemical and thermal stability, they can be used in water desalination, ultrafiltration process in food industries, waste water treatment and separation of gas mixtures.1 Inorganic membrane can be classified into two types; namely, non-porous(dense) membranes and porous membranes.2 The important factors in the membrane separation process are both the permeability and the selectivity. However, the selectivity of a membrane decreases as the permeability increases. This trend is confirmed by the corelation of selectivity versus permeability.3 Since the polymer membrane is non-porous, the fluxes and permeabilities are very small. However, as the separation occurs via the so-called solution-diffusion mechanism, the selectivity of polymer membrane is much high.4 The mechanism of gas separation by a porous alumina membrane or Vycor glass, is closely related to the membrane pore size relative to the permeate molecule size as well as other physical and chemical properties of the membrane and the permeate species.5,6
KeywordsSurface Diffusion Hydrogen Selectivity Transmembrane Pressure Modification Step Knudsen Diffusion
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- 10.K.-Y. Yoon, J.-H. So, I.-H. Cho, S. B. Park, W.-H. Hong, and S.-M. Yang, Preparation of alumina membrane for hydrogen separation by multi-step pore modification 7th World Filtration Congress, Budapest, Hungary (1996).Google Scholar