Seeding-free synthesis of oriented zeolite LTA membrane on PDI-modified support for dehydration of alcohols
Seeding-free synthesis of oriented zeolite LTA membrane on PDI-modified support for dehydration of alcohols
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DOI：
10.1080/01496395.2018.1434203
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发表时间：
2018-02
影响因子：
2.8
通讯作者：
Kai Xu;Haiming Jin;Linfang Wang;Yi Liu;Chen Zhou;J. Caro;A. Huang
中科院分区：
文献类型：
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作者：
Kai Xu;Haiming Jin;Linfang Wang;Yi Liu;Chen Zhou;J. Caro;A. Huang
摘要以1，4-苯二异氰酸酯（PDI）为分子连接剂，采用无晶种法制备了定向分子筛LTA膜。在水热合成之前，-NCO基团通过PDI功能化Al 2 O3载体而引入。一个薄的，良好的共生沸石LTA膜的厚度约为4.0 μm，可以形成在PDI改性的Al 2 O3载体。沸石LTA膜对醇类具有良好的渗透汽化脱水性能。在90°C下，沸石LTA膜对95wt%乙醇/水混合物的脱水分离因子为4480，水通量为3.4 kg·m-2·h-1。
ABSTRACT A seeding-free synthesis method is developed for preparation of oriented zeolite LTA membranes by using 1,4-phenylene diisocyanate (PDI) as a molecular linker. Before hydrothermal synthesis, –NCO groups are introduced with the functionalization of Al2O3 supports by PDI. A thin, well intergrown zeolite LTA membrane with a thickness of about 4.0 µm can be formed on the PDI-modified Al2O3 supports. The zeolite LTA membrane displays high pervaporation performances for dehydration of alcohols. At 90°C, the separation factor of the zeolite LTA membrane is 4480 for dehydration of 95 wt% ethanol/water mixtures, with a high water flux of 3.4 kg·m−2·h−1.