Preparation of highly permeable membranes for hydrogen separation using a CVD technique
- Seikei Univ., Tokyo (Japan)
Dense metallic membranes, particularly palladium-based membranes exhibit an extremely high selectivity for hydrogen separation. Since a hydrogen flux is inversely proportional to the thickness of membrane, reduction in the thickness of membrane is effective to prepare highly permeable membranes. The authors proposed a composite membrane consisting of a thin palladium film supported on an inorganic porous support having minute, controlled pores of 200-300 nm in size. The membrane had an extremely high (100%) selectivity and gave a rate of hydrogen permeation at least 30 times greater than a commercial palladium-based membrane. The membranes had thickness ranging from 4.5-20 {mu}m, which was thick compared with an inner diameter of the support. For the purpose of preparing more efficient membranes for hydrogen permeation, the authors prepared asymmetric membranes consisting of palladium deposited inside the pores (average size, 200 nm) of an alumina membrane by a CVD technique. Acetylacetonato-complex was selected as the metal source because it was successively applied to form an ultra-thin film of copper. The most suitable temperatures of sublimation and decomposition were determined to be 460 and 570 K, respectively. The membranes thus prepared were characterized by SEM, EPMA, XRD and hydrogen permeation tests.
- OSTI ID:
- 213141
- Report Number(s):
- CONF-940713--
- Country of Publication:
- United States
- Language:
- English
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