Song Hongling, Peng Yuan, Wang Chenlu, Shu Lun, Zhu Chenyu, Wang Yanlei, He Hongyan, Yang Weishen
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China.
University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2023 Apr 17;62(17):e202218472. doi: 10.1002/anie.202218472. Epub 2023 Mar 20.
High-purity H production accompanied with a precise decarbonization opens an avenue to approach a carbon-neutral society. Metal-organic framework nanosheet membranes provide great opportunities for an accurate and fast H /CO separation, CO leakage through the membrane interlayer galleries decided the ultimate separation accuracy. Here we introduce low dose amino side groups into the Zn (benzimidazolate) conformation. Physisorbed CO served as interlayer linkers, gently regulated and stabilized the interlayer spacing. These evoked a synergistic effect of CO adsorption-assisted molecular sieving and steric hinderance, whilst exquisitely preserving apertures for high-speed H transport. The optimized amino membranes set a new record for ultrathin nanosheet membranes in H /CO separation (mixture separation factor: 1158, H permeance: 1417 gas permeation unit). This strategy provides an effective way to customize ultrathin nanosheet membranes with desirable molecular sieving ability.
高纯度氢气生产伴随着精确的脱碳为迈向碳中和社会开辟了一条途径。金属有机框架纳米片膜为精确快速的氢气/一氧化碳分离提供了巨大机遇，一氧化碳通过膜层间通道的泄漏决定了最终的分离精度。在此，我们将低剂量氨基侧基引入到锌（苯并咪唑）结构中。物理吸附的一氧化碳作为层间连接体，温和地调节并稳定层间距。这些引发了一氧化碳吸附辅助分子筛效应和空间位阻的协同作用，同时巧妙地保留了用于高速氢气传输的孔径。优化后的氨基膜在氢气/一氧化碳分离方面为超薄纳米片膜创造了新纪录（混合分离因子：1158，氢气渗透率：1417气体渗透单位）。该策略为定制具有理想分子筛能力的超薄纳米片膜提供了有效方法。
