Study on the Sorption Ability of Hydrogen Isotopes in CHA-Type Zeolite and the Preparation of Zeolite Membran

2022 Fiscal Year Final Research Report

• Project/Area Number: 19H01872
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 14020:Nuclear fusion-related
• Research Institution: University of Toyama
• Principal Investigator: Taguchi Akira 富山大学, 学術研究部理学系, 講師 (40401799)
• Co-Investigator(Kenkyū-buntansha): 近江 靖則 岐阜大学, 高等研究院, 准教授 (50313713)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 水素同位体 / 同位体分離 / ゼオライト

Outline of Final Research Achievements

The hydrogen isotope separation ability of chabazite (CHA) and Linde Type A (LTA) zeolites, both of which possess an eight-membered ring (Si8O8), were investigated. The D2/H2 separation factor (SD2/H2) evaluated using thermal desorption spectroscopy (TDS) at an adsorption temperature of 201 K was about 1.10 for Na-CHA and K-CHA, while that for LTA(3A) was 1.00 for LTA(3A). This indicates that the CHA-type zeolite is expected to be an effective adsorbent for hydrogen isotope separation.
In this study, the thermal adsorption spectroscopy (TAS) has been developed. By the TAS study from 77 to 273 K, it was found that the Na-, Ca- and K-CHA zeolites adsorb hydrogen (H2 and D2) at around 200 K. In contrast, other adsorbent such as LTA(4A), active carbon or Ni-MOF-74 did not demonstrate any hydrogen uptake at higher than about 100 K. Such an intrinsic adsorption of hydrogen in CHA-type zeolites appears to be closely related to the large separation factor observed in TDS study.

Free Research Field

多孔体材料

Academic Significance and Societal Importance of the Research Achievements

医薬品，半導体材料，電子材料の製造等において，重水素の需要が拡大される中，環境負荷の小さい重水素の分離，生成技術の確立が求められている。本研究で見出した8員環（Si8O8）細孔を有するCHA型ゼオライトの同位体分離能は，今後の分離材料の設計と開発に貢献するものと考える。また，本研究で考案した水素同位体の昇温吸着測定は，従来と異なる水素同位体吸着能に関する知見を与え，材料開発は基より，同位体分離能の評価に応用出来ると考える。