Seeding-free synthesis of FAU-type membrane with dry gel modified α-alumina support
Seeding-free synthesis of FAU-type membrane with dry gel modified α-alumina support
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DOI：
10.1016/j.micromeso.2021.111219
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发表时间：
2021-08
影响因子：
5.2
通讯作者：
B. Xia;Songyi Wang;Beibei Li;Yi Cao;Taohong Liu;Peng Gao;Chen Chen-Chen;Yanshuo Li
中科院分区：
文献类型：
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作者：
B. Xia;Songyi Wang;Beibei Li;Yi Cao;Taohong Liu;Peng Gao;Chen Chen-Chen;Yanshuo Li
采用干凝胶改性的α-Al 2 O3载体，制得致密、纯净的分子筛FAU膜.在老化-微波（AM）处理之前，α-氧化铝载体被干燥的均匀凝胶层覆盖。与单一AM法制备的膜相比，干凝胶改性AM法制备的FAU分子筛膜在60 °C下对水/乙醇（10/90）混合物的渗透汽化通量平均为2.19 kg/m2·h，水渗透率平均为99.5%。表征结果表明，干凝胶层上局部较高的碱度能促进FAU沸石膜的成核和生长。但干凝胶含量过高会导致方钠石（SOD）杂质的形成。在此基础上，对干凝胶改性AM法制备FAU分子筛膜的工艺条件进行了系统的优化。在最佳条件下制备的高性能FAU膜重复性好、效率高，表明干凝胶改性AM法是一种很有前途的合成纯沸石FAU膜的方法。
Dense and pure zeolite FAU membrane was obtained with dry gel modified α-alumina support. Before aging-microwave (AM) process, α-alumina support was covered with dry homogenous gel layer. Compared to membrane synthesized with the single AM process, zeolite FAU membrane prepared with dry gel modified AM method displayed high pervaporation performance with flux of 2.19 kg/m2·h (average value) and water permeation of 99.5% (average value) for the mixture of water/ethanol (10/90) at 60 °C. Characterizations revealed that high local alkalinity over the dry gel layer could promote the nucleation and the growth of zeolite FAU membrane. However, excessive content of dry gel caused the formation of Sodalite (SOD) impurities. Furthermore, the synthesis conditions of zeolite FAU membrane with dry gel modified AM method were optimized systematically. The synthesis of high-performance membrane with the optimal conditions showed good reproducibility and high efficiency, implying that dry gel modified AM method was a promising method to synthesize pure zeolite FAU membrane.