Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, North Zhongshan Rd. 3663, Shanghai, 200062, China.
School of Physical Science and Technology & Shanghai Key Laboratory of High-resolution Electron Microscopy, ShanghaiTech University, Shanghai, 201210, China.
Angew Chem Int Ed Engl. 2023 Jun 19;62(25):e202304734. doi: 10.1002/anie.202304734. Epub 2023 May 11.
Membrane separation is an energy-efficient and environmentally friendly process. Two-dimensional (2D) molecular sieving membranes featuring unique nanopores and low transport resistance have the potential to achieve highly permeable and selective mixture separation with low energy consumption. High-aspect-ratio zeolite nanosheets with intrinsic molecular-sieving pores perpendicular to the layers are desirable building blocks for fabricating high-performance 2D zeolite membrane. However, a wider application of 2D zeolitic membranes is restricted by the limited number of recognized zeolite nanosheets. Herein, we report a swollen layered zeolite, ECNU-28, with SZR topology and eight-member ring (8-MR, 3.0 Å×4.8 Å) pores normal to the nanosheets. It can be easily exfoliated to construct 2D membrane, which shows a high hydrogen selectivity up to 130 from natural gas and is promising for hydrogen purification and greenhouse gas capture.
膜分离是一种节能且环保的工艺。二维（2D）分子筛膜具有独特的纳米孔和低传输阻力，有望实现具有低能耗的高渗透性和选择性混合物分离。具有垂直于层的本征分子筛孔的高纵横比沸石纳米片是制造高性能 2D 沸石膜的理想构建块。然而，二维沸石膜的更广泛应用受到公认的沸石纳米片数量有限的限制。在此，我们报告了一种具有 SZR 拓扑和垂直于纳米片的八元环（8-MR，3.0 Å×4.8 Å）孔的溶胀层状沸石 ECNU-28。它可以很容易地剥离以构建二维膜，该膜对天然气的氢选择性高达 130，有望用于氢气净化和温室气体捕集。
