Beta/碳纳米复合分子筛膜的制备

Preparation of Beta-zeolite/Carbon Nanocomposite Membrane

利用浸渍提拉方法,在平均孔径500 nm的管状α-Al_2O_3陶瓷管载体上成功制备了无缺陷的Beta/碳纳米复合分子筛膜．通过室温下单组分气体渗透实验,发现当Beta分子筛在聚糠醇/丙酮溶液中的含量逐渐加大时,复合膜的气体分离因数略有增加,同时气体渗透通量明显加大．经优化后氢气渗透通量比纯碳膜增加了一个数量级,说明Beta分子筛起到了加快气体渗透通量的作用．由SEM照片可以发现,随着Beta分子筛含量的增加,制备的纳米复合膜的厚度由平均14μm减少到7μm左右,从而减少了气体渗透的阻力．结合实验数据,探讨了沸石分子筛/碳复合膜气体渗透路径．

A novel Beta-zeolite/carbon nanocomposite membrane has been prepared on a porous α-Al2O3 substrate by dip-coating. By single component gas experiments at room temperature, the Beta-zeolite/carbon nanocomposite membrane exhibits hydrogen permeations that are one order of magnitude higher than pure carbon membrane with comparable permselectivities. R shows that Beta-zeolite acts as high gas permeable phase in membranes. From the SEM images, when the amount of Beta-zeolite is increased, the thickness of nanocomposite membrane is reduced from 14 μm to 7 μm, which is helpful to decrease the resistance of gas permeance. Finally, the pathway through nanocomposite membrane is inferred by the experimental data and SEM images.