The Catalytic Exchange of Hydrogen-Deuterium on Copper-Nickel Alloy Plates after Various Surface Treatments
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概要
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The catalytic activities of nine copper-nickel alloys (5 cm<SUP>2</SUP> in area) in hydrogen-deuterium exchange were examined at 1.5 Torr partial pressures of hydrogen and deuterium, using an ultra-high vacuum apparatus incorporated with an omegatron mass spectrometer for continuous gas analysis. Without any surface treatment, the activity was greatest on pure nickel, decreased gradually as the content of copper in the alloys increased and virturally vanished in the alloys containing copper more than 70%. The activity of each alloy sample was observed to be extremely enhanced by a slight surface treatment of oxidation-reduction (<I>P</I>o<SUB>2</SUB>=2.3 Torr at 500°C for 1 min, <I>P</I><SUB>H<SUB>2</SUB></SUB>=16 Torr at 300°C for 2 hr). The activity of the 85% copper alloy after the oxidation-reduction treatment was greatest, one hundred times that of pure nickel. Annealing for a short time in an ultra-high vacuum subsequent to the oxidation-reduction treatment caused the catalytic activity to decrease abruptly at a critical temperature (425°C). On the bases of the electron microscopic observations and the measurement of the surface roughness changed by the pre-treatments, the nature of active sites on copper-nickel alloys was discussed.
- 公益社団法人 日本化学会の論文
著者
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Yamashina Toshiro
Department Of Nuclear Engineering Hokkaido University
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Takasu Yoshio
Department Of Fine Material Engineering Faculty Of Textile Scinece And Technology Shinshu University
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Takasu Yoshio
Department of Nuclear Engineering Hokkaido University
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