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- 저자 : Masao Komaki (검색결과 1 건)
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The effects of gas mixtures on hydrogen permeation through Pd–Ag/V–Ni alloy composite membrane
John Hulme,Masao Komaki,Chikashi Nishimura,곽지혜 한국물리학회 2011 Current Applied Physics Vol.11 No.4
The effects of gas mixtures on hydrogen permeation through Pd―Ag coated V―Ni composite membranes were investigated by gas permeation technique in the temperature range of 473―673 K at atmospheric pressure. Dense Pd―25Ag layer was sputtered on the V―15Ni alloy film prepared by arc-melting. Hydrogen permeation experiments for as-prepared Pd―Ag/V―Ni composite membrane were carried out with pure hydrogen and different gas mixtures of H_2/CO_2 and H_2/H_2S. Long-term permeation tests were performed with the mixture feed of 30%-CO_2 in H_2 and 11 ppm-H_2S in H_2. As the percentage of gas impurity increased, the hydrogen permeability decreased. However, the composite membrane did not suffer irreparable damage when exposed to CO_2 and the flux value for pure hydrogen was readily recovered by post-treatment in the permeation system. For the H_2S impurity, the interaction with the membrane surface was significantly different compared to CO_2. Membrane permeability rapidly deteriorated when exposed to a small percentage of H_2S. Nevertheless, the membrane does not seem to be damaged as the permeability was fully recovered by longer post-treatment with pure hydrogen.
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