State Key Laboratory of Fine Chemicals, Institute of Adsorption and Inorganic Membrane, Dalian University of Technology, Linggong Road NO. 2, Ganjingzi District, Dalian, Liaoning, 116024, P. R. China.
Panjin Institute of Industrial Technology, Dalian University of Technology, Panjin, 124221, P. R. China.
Chem Asian J. 2022 Mar 1;17(5):e202101404. doi: 10.1002/asia.202101404. Epub 2022 Jan 20.
Isomorphous substitution of heteroatoms is an effective platform for finely tuning the pore chemistry, pore structure, and surface properties of the zeolite framework as catalysts or separation membranes. A continuous and compact isomorphously substituted tungsten (W)-MFI membrane was firstly developed on coarse α-Al O tube dip-coated with W-MFI seeds using hydrothermal secondary growth and pretreated synthesis solution. The synthesized W-MFI membrane is found to be ethanol permselective having a pervaporation based separation factor and flux of 69 and 2.50 kg/m h, respectively while exhibiting the highest separation index of 170 kg/m h for the separation of 5 wt% ethanol-water mixture among the reported heteroatoms substituted and α-Al O supported tubular MFI membranes. The isomorphous substitution of W improves the hydrophobicity and also plays a significant role for the enhanced separation performance.
杂原子同晶取代是精细调节沸石骨架作为催化剂或分离膜的孔化学、孔结构和表面性质的有效平台。本文首次采用水热二次生长和预处理合成溶液，在粗α-Al2O3管上浸涂 W-MFI 种子，制备了连续致密的同晶取代钨（W）-MFI 膜。研究发现，所合成的 W-MFI 膜具有乙醇渗透性，基于渗透蒸发的分离因子和通量分别为 69 和 2.50kg/m2h，在报道的杂原子取代和α-Al2O3负载管状 MFI 膜中，对 5wt%乙醇-水混合物的分离具有最高的分离指数 170kg/m2h。W 的同晶取代提高了疏水性，对增强分离性能也起着重要作用。
