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Means NC, Haynes DJ, Enick RM, Howard BH, Shekhawat D. Optimal temperature range for the separation of a mixture of 96% protium and 4% deuterium with a palladium membrane. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.121189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Abstract
Pd–Ag alloys are largely used as hydrogen separation membranes and, as a consequence, the Pd–Ag–H system has been intensively studied. On the contrary, fewer information is available for the Pd–Ag–D system; thus, the aim of this work is to improve the knowledge of the isotope effect on the commercial Pd77Ag23 alloy, especially for temperature above 200 °C. In particular, deuterium absorption measurements are carried out in the Pd77Ag23 alloy in the temperature range between 79 and 400 °C and in the pressure range between 10−2 and 16 bar. In this exploited pressure (p) and composition (c) range, above 300 °C the pc isotherms display the typical shape of materials where only a solid solution of deuterium is present while at lower temperatures these curves seem to be better described by the coexistence of a solid solution and a deuteride in a large composition range. The obtained results are compared and discussed with the ones previously measured with the lightest hydrogen isotope. Such a comparison shows that the Pd77Ag23 alloy exhibits a clear inverse isotope effect, as the equilibrium pressure of the Pd–Ag–D system is higher than in Pd–Ag–H by a factor of ≈2 and the solubility of deuterium is about one half of that of hydrogen. In addition, the absorption measurements were used to assess the deuteration enthalpy that below 300 °C is ΔHdeut = 31.9 ± 0.3 kJ/mol, while for temperatures higher than 300 °C, ΔHdeut increases to 43 ± 1 kJ/mol. Additionally, in this case a comparison with the lighter isotope is given and both deuteration enthalpy values result lower than those reported for hydrogenation. The results described in this paper are of practical interest for applications operating above 200 °C, such as membranes or packing column, in which Pd77Ag23 has to interact with a gas stream containing both hydrogen isotopes.
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Saitoh H, Homma H, Noya Y, Ohnishi T. Observation of Tritium Distribution in Pure Vanadium and V-5 mol%Fe Alloy by Tritium Radioluminography. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst02-a22647] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hideyuki Saitoh
- Materials Science and Engineering Muroran Institute of Technology Mizumoto, Muroran 050-8585, Japan
| | - Hirofumi Homma
- Materials Science and Engineering Muroran Institute of Technology Mizumoto, Muroran 050-8585, Japan
| | - Youichi Noya
- Central Institute of Radioisotope Science Hokkaido University Sapporo 060-0815, Japan
| | - Toshiyuki Ohnishi
- Central Institute of Radioisotope Science Hokkaido University Sapporo 060-0815, Japan
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Hempelmann R. Inelastische Neutronenstreuung zur Untersuchung des Wasserstoff-Potentials in Metallen. Z PHYS CHEM 1987. [DOI: 10.1524/zpch.1987.154.part_1_2.221] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Hempelmann R, Richter D, Price DL. High-energy-neutron vibrational spectroscopy on beta -V2H. PHYSICAL REVIEW LETTERS 1987; 58:1016-1019. [PMID: 10034310 DOI: 10.1103/physrevlett.58.1016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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