Abstract
Microporous silica membranes prepared by the sol-gel method are reviewed. Silica membranes having hydrogen
permselectivity are expected to be in use for steam reforming of methane, which requires high permselectivity and
hydrothermal stability at high temperatures. In the overview of recent development of microporous silica membranes regarding substrates, intermediate layers, and separation layers, the improvement of hydrothermal stability of
amorphous silica by incorporating metal elements such as Ni and Co was emphasized. A catalytic membrane which
has separation and reaction ability is also reviewed.
