Preparation of zeolite NaA membranes on the inner side of tubular supports by means of a controlled seeding technique
Preparation of zeolite NaA membranes on the inner side of tubular supports by means of a controlled seeding technique
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DOI：
10.1016/j.cattod.2005.03.042
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发表时间：
2005-06
期刊：
影响因子：
5.3
通讯作者：
M. Pera‐Titus;J. Llorens;F. Cunill;R. Mallada;Jesfis Santamaria
中科院分区：
文献类型：
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作者：
M. Pera‐Titus;J. Llorens;F. Cunill;R. Mallada;Jesfis Santamaria
采用种子水热合成法在多孔α-氧化铝管状载体的内表面制备了NaA沸石膜。已经开发了交叉流过滤技术，以允许根据跨膜压力、pH、晶种悬浮液流速、晶体尺寸和浓度从悬浮液中控制接种沸石NaA晶体。最佳的接种增重被发现是约0.40mgcm-2的膜面积。在92：8 wt.%的渗透汽化条件下，在0.50kgm-2 h-1的通量下，得到了选择性高达600的沸石膜乙醇/水混合物。
Zeolite NaA membranes have been reproducibly prepared by seeded hydrothermal synthesis on the internal surface of porous α-alumina tubular supports. A cross-flow filtration technique has been developed to allow a controlled seeding of zeolite NaA crystals from a suspension according to transmembrane pressure, pH, seed suspension flow rate, crystal size and concentration. The optimal seeding weight gain was found to be around 0.40mgcm−2of membrane area. With this procedure, zeolite membranes with selectivities up to 600 at fluxes of 0.50kgm−2h−1were obtained in the pervaporation of 92:8wt.% ethanol/water mixtures at 323K.