Chemical Engineering Department , Delft University of Technology , Van der Maasweg 9 , 2629 HZ Delft , The Netherlands.
Inorganic Membranes, MESA+ Institute for Nanotechnology , University of Twente , P.O. Box 217, 7500 AE Enschede , The Netherlands.
ACS Appl Mater Interfaces. 2018 Oct 3;10(39):33574-33580. doi: 10.1021/acsami.8b12613. Epub 2018 Sep 24.
We demonstrate that b-oriented MFI (Mobil Five) zeolite membranes can be manufactured by in situ crystallization using an intermediate amorphous SiO layer. The improved in-plane growth by using a zeolite growth modifier leads to fusion of independent crystals and eliminates boundary gaps, giving good selectivity in the separation of CO/Xe mixtures. The fast diffusion of CO dominates the overall membrane selectivity toward the CO/Xe mixture. Because of the straight and short [010] channels, the obtained CO permeation fluxes are several orders of magnitude higher than those of carbon molecular sieving membranes and polymeric membranes, opening opportunities for Xe recovery from waste anesthetic gas.
我们证明，通过使用中间的无定形 SiO 层，采用原位结晶法可以制备出取向的 MFI（ Mobil Five ）沸石膜。通过使用沸石生长调节剂来改善面内生长，导致独立晶体的融合并消除边界间隙，从而在 CO/Xe 混合物的分离中表现出良好的选择性。CO 的快速扩散主导了 CO/Xe 混合物的整体膜选择性。由于具有笔直而短的 [010] 通道，所获得的 CO 渗透通量比碳分子筛膜和聚合物膜高几个数量级，为从废麻醉气体中回收 Xe 开辟了机会。
