Zeolite NaA membranes were prepared in a clear synthesis solution without the aid of nanoseeds. To improve the properties of the membranes formed in a clear solution, alumina hollow fibers were fabricated by adding silica powder to the conventional spinning slurry, resulting in hollow fibers with a mullite phase. Prior to the membrane synthesis, the hollow fibers were pretreated by dipping in an aged synthesis solution diluted with isopropanol. Dense zeolite NaA membranes on mullite‐containing alumina hollow fibers were successfully obtained at 100°C for 2 h without the aid of nanoseeds. The membranes have a good pervaporation performance with a high flux of 10.8 kg m⁻² h⁻¹ and a separation factor of over 10,000. The abundant mullite‐phase hydroxyl groups on the support surface promote the nucleation and growth of zeolite crystals on the support, resulting in dense membranes. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2679–2688, 2018

中文翻译：

---

通过在Al2O3中空纤维前体中添加SiO2在透明溶液中制备高性能NaA沸石膜

NaA沸石膜是在无纳米种子帮助下的透明合成溶液中制备的。为了改善在透明溶液中形成的膜的性能，通过将二氧化硅粉末添加到常规纺丝浆料中来制备氧化铝中空纤维，从而得到具有莫来石相的中空纤维。在膜合成之前，通过将中空纤维浸入用异丙醇稀释的老化的合成溶液中进行预处理。在不使用纳米种子的情况下，在100°C下成功地将含莫来石的氧化铝中空纤维上的致密沸石NaA膜制备了2 h。膜具有良好的全蒸发性能，通量高达10.8 kg m ^-2 h ^-1分离系数超过10,000。支撑物表面上富铝红柱石相羟基促进了支撑物上沸石晶体的形核和生长，从而形成了致密的膜。©2018美国化学工程师学会AIChE J，64：2679–2688，2018