Abstract
This chapter discusses the basic principles and the recent advancement of microporous silica membrane. It discusses several inorganic membranes are available, focusing on the synthesis and applications of microporous amorphous silica membranes. Microporous amorphous silica exhibits a weak stability in aqueous solutions or wet streams, which limits its use as separative membranes to specific applications. The main current developments deal with gas separation applications—in particular hydrogen separation. The thermal stability of silica membranes compared with organic and hybrid layers and their interconnected porosity inside a stiff oxide skeleton enable to reach very good permeability–selectivity balances. The chapter discusses different synthesis methods used to prepare supported amorphous silica membranes. The designing of silica membrane and associated separative properties are also explained.
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