Chemical Technology, Luleå University of Technology, Porsön Campus, 97187 Luleå (Sweden).
Angew Chem Int Ed Engl. 2014 Mar 24;53(13):3492-5. doi: 10.1002/anie.201311324. Epub 2014 Mar 3.
Membrane separation of CO2 from natural gas, biogas, synthesis gas, and flu gas is a simple and energy-efficient alternative to other separation techniques. But results for CO2 -selective permeance have always been achieved by randomly oriented and thick zeolite membranes. Thin, oriented membranes have great potential to realize high-flux and high-selectivity separation of mixtures at low energy cost. We now report a facile method for preparing silica MFI membranes in fluoride media on a graded alumina support. In the resulting membrane straight channels are uniformly vertically aligned and the membrane has a thickness of 0.5 μm. The membrane showed a separation selectivity of 109 for CO2/H2 mixtures and a CO2 permeance of 51×10(-7) mol m(-2) s(-1) Pa(-1) at -35 °C, making it promising for practical CO2 separation from mixtures.
从天然气、沼气、合成气和废气中分离二氧化碳的膜分离是一种简单且节能的替代其他分离技术的方法。但是，对于 CO2 选择渗透性的结果，一直都是通过随机取向和厚沸石膜来实现的。薄的、取向的膜具有很大的潜力，可以在低能耗下实现混合物的高通量和高选择性分离。我们现在报告了一种在分级氧化铝载体上在氟化物介质中制备硅 MFI 膜的简便方法。在得到的膜中，直通道均匀地垂直排列，膜的厚度为 0.5μm。该膜对 CO2/H2 混合物的分离选择性为 109，在-35°C 时 CO2 的渗透系数为 51×10(-7)mol m(-2)s(-1)Pa(-1)，有望从混合物中实际分离 CO2。
