超薄膜で記録的な水素分離を実現(Ultrathin films achieve record hydrogen separation)

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2023-10-04 スイス連邦工科大学ローザンヌ校(EPFL)

◆金属有機フレームワーク(MOFs)は、ナノサイズの孔を持つ材料で、内部表面積が広いため、石油化学品やガスの分離、水からの重金属除去など、多くの用途に適しています。特に、水素と窒素の分離には環境への利点があり、クリーンエネルギー生産などに重要です。
◆EPFLの研究チームは、MOFフィルムを開発し、水素-窒素の分離に優れた性能を示しました。このフィルムは超薄く、高い効率のガス分離に可能性があります。

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膜応用のためのユニットセル厚ゼオライトイミダゾレート骨格膜 Unit-cell-thick zeolitic imidazolate framework films for membrane application

Qi Liu,Yurun Miao,Luis Francisco Villalobos,Shaoxian Li,Heng-Yu Chi,Cailing Chen,Mohammad Tohidi Vahdat,Shuqing Song,Deepu J. Babu,Jian Hao,Yu Han,Michael Tsapatsis &Kumar Varoon Agrawal
Nature Materials  Published:21 September 2023
DOI:https://doi.org/10.1038/s41563-023-01669-z

超薄膜で記録的な水素分離を実現(Ultrathin films achieve record hydrogen separation)

Abstract

Zeolitic imidazolate frameworks (ZIFs) are a subset of metal–organic frameworks with more than 200 characterized crystalline and amorphous networks made of divalent transition metal centres (for example, Zn2+ and Co2+) linked by imidazolate linkers. ZIF thin films have been intensively pursued, motivated by the desire to prepare membranes for selective gas and liquid separations. To achieve membranes with high throughput, as in ångström-scale biological channels with nanometre-scale path lengths, ZIF films with the minimum possible thickness—down to just one unit cell—are highly desired. However, the state-of-the-art methods yield membranes where ZIF films have thickness exceeding 50 nm. Here we report a crystallization method from ultradilute precursor mixtures, which exploits registry with the underlying crystalline substrate, yielding (within minutes) crystalline ZIF films with thickness down to that of a single structural building unit (2 nm). The film crystallized on graphene has a rigid aperture made of a six-membered zinc imidazolate coordination ring, enabling high-permselective H2 separation performance. The method reported here will probably accelerate the development of two-dimensional metal–organic framework films for efficient membrane separation.

0505化学装置及び設備
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