ナノ多孔質金属有機構造体における水素吸着および同位体分離に及ぼす構造決定因子の影響

Sibo Chetry¹, Prantik Sarkar^2,3, Mahnaz Bakhtian¹

¹Faculty of Chemistry, Leipzig University, Johannisallee 29, Leipzig 04103, Germany.

|February 25, 2026

Abstract:

Efficient separation of dihydrogen isotopologues, particularly D₂, is critical for applications in nuclear energy technology and environmental sciences. Conventional methods, such as cryogenic distillation, are energy-intensive and provide limited selectivity (S ≈ 1.4). Here, we report a systematic evaluation of diverse MOFs with ultramicropores, open metal sites (OMS), and framework flexibility for D₂/H₂ separation. Thermal desorption spectroscopy (TDS) and adsorption studies revealed that ultramicroporous MOFs enable preferential D₂ adsorption via kinetic quantum sieving, while bimetallic Ni-MOF-74(Co) achieves high selectivity (S = 52 at 77 K) through OMS-driven chemical affinity quantum sieving. Flexible MOFs, [Cu₂(ⁿPr-trz-ia)₂] and [Cu₂(Et-trz-ia)₂], show temperature-responsive cryogenic flexibility with selectivities of 1.4-2.3 at 77 K. These findings highlight structural design as the key to advancing dihydrogen isotopologue separation at practical temperatures.

キーワード:

MOF 柔軟な構造体水素同位体分離微細多孔性開金属サイト

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