Hydrogen isotope separation at exceptionally high temperature using an unsaturated organometallic complex
A new approach for hydrogen isotope separation using an unsaturated organometallic complex was proposed. Adsorption measurements of [Mn(dppe)<sub>2</sub>(CO)(N<sub>2</sub>)](BArF<sup>24</sup>) (Mn-dppe) (dppe = 1,2-bis(diphenylphosphino)ethane, BArF<sup>24</sup> = B[C<sub>6</sub>H<sub>3</sub>(3,5-CF<sub>3</sub>)<sub>2</sub>]<sub>4</sub>) using H<sub>2</sub> and D<sub>2</sub> revealed a significant difference in the adsorption enthalpy of H<sub>2</sub>/D<sub>2</sub> at much higher room temperatures than in previous studies, with D<sub>2</sub> molecules being more strongly adsorbed on unsaturated metal sites. Mixed gas adsorption isotherms were calculated at each temperature using IAST, and it was predicted that D<sub>2</sub> uptake was much larger than H<sub>2</sub> uptake. Column chromatographic separation using the difference in adsorption enthalpy indicated that deuterium could be concentrated, and DFT calculations suggest that this difference in adsorption force is due to the difference in vibrational potentials involved in metal-dihydrogen bonding. This study introduces a new separation approach that could enable hydrogen isotope separation in the ambient temperature range.
Authors
- Shin‐ichiro Noro (ORCID: https://orcid.org/0000-0003-4757-4741)
- Kaiji Uchida
- Takefumi Yoshida (ORCID: https://orcid.org/0000-0003-3479-7890)
- Ryojun Toyoda (ORCID: https://orcid.org/0000-0002-0168-0533)
- Tamon Yamauchi
- Naoki Kishimoto (ORCID: https://orcid.org/0000-0003-2988-456X)
- Hiroaki Iguchi (ORCID: https://orcid.org/0000-0001-5368-3157)
- Ryota Sakamoto (ORCID: https://orcid.org/0000-0002-8702-1378)
- Shinya Takaishi (ORCID: https://orcid.org/0000-0002-6739-8119)
- Hao Xue
- Tomoya Uruga
- Taku Kitayama
- Shunya Tanaka
Institutions
- Tohoku University (JP)
- University of Electro-Communications (JP)
- Hokkaido University (JP)
- SPring-8 (JP)
- RIKEN (JP)
- Japan Synchrotron Radiation Research Institute (JP)
- Tokyo Metropolitan Industrial Technology Research Institute (JP)
- Wakayama University (JP)
Publication Details
- Journal
- Dalton Transactions
- Published
- 2024-12-23
- DOI
- https://doi.org/10.1039/d4dt03018d
- Citations
- 2
- Primary Topic
- Chemical Synthesis and Characterization
- Type
- article
- Field-Weighted Citation Impact
- 0.59
Funders
- Institute for Quantum Chemical Exploration
- Japan Science and Technology Corporation
- ENEOS Hydrogen Trust Fund
- Japan Society for the Promotion of Science