Abstract
Hydrogen separation properties in pore channels with the diameter comparable to CO 2 or less were investigated by using molecular sieving carbon membranes from polyimide. The accurate control of the pore channels in sub-nanometer scale gave membranes with quite high H 2/CO selectivity on permeation, which can be used for hydrogen purification system. Adsorption and diffusion properties of hydrogen in the very narrow nano-channels were measured by the permeability measurement through the membranes. The activation energy of hydrogen diffusion in the nano-channels, which depends on the pore diameter and is 2–6 times higher than that on graphite surface, was determined from the temperature dependence of the diffusion coefficient.
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