Abstract
Ceramic membranes with micropores smaller than 1 nm have great potential for gas separation. Compared to polymer membranes, microporous ceramic membranes with molecular sieve-like properties have relatively high gas permeances and a good stability at higher-temperatures. Moreover, microporous ceramic membranes can be expected to use in membrane reactors for conversion enhancement in methane reforming reactions for hydrogen production. This report presents recent research topics on the development of hydrogen permselective microporous ceramic membranes at our institute : Mesoporous amorphous alumina capillary tube (MAAC) as a fine porous support for microporous ceramic membranes fabricated by novel pulse sequential anodic oxidation technique, chemical solution precursor-derived novel nickel nanoparticle-dispersed amorphous silica membranes on the MAAC synthesized by in-situ compositing technique, and microporous amorphous silica membranes on a porous ceramic support by polymer pyrolysis technique. These techniques can provide control of the micro-/meso-porous structure as well as control of the chemical composition at the atomic/molecular levels, which leading to the development highly efficient microporous ceramic membranes for high-temperature separation of hydrogen.
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