Microwave-assisted hydrothermal synthesis of hydroxy-sodalite zeolite membrane
Microwave-assisted hydrothermal synthesis of hydroxy-sodalite zeolite membrane
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DOI：
10.1016/j.micromeso.2004.07.019
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发表时间：
2004-11
影响因子：
5.2
通讯作者：
Xiaochun Xu;Y. Bao;Chunshan Song;Weishen Yang;Jie Liu;Liwu Lin
中科院分区：
文献类型：
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作者：
Xiaochun Xu;Y. Bao;Chunshan Song;Weishen Yang;Jie Liu;Liwu Lin
采用微波辅助水热合成（MAHS）方法，在α- al2o3载体上成功合成了高质量的纯羟基钠沸石膜。通过x射线衍射（XRD）、扫描电镜（SEM）和气体渗透性测量，研究了合成时间、合成工艺等合成条件对MAHS法制备羟基钠沸石分子筛膜的影响。MAHS法合成羟基钠沸石膜仅需45min，比传统水热合成（CHS）法快8倍以上。MAHS法容易合成纯的氢氧钠沸石分子筛膜，而CHS法通常合成由NaX沸石、NaA沸石和氢氧钠沸石分子筛组成的沸石膜。制备工艺的影响对羟基钠石沸石膜的形成有很大的影响，单段合成工艺可制得纯羟基钠石沸石膜。MAHS法制备的纯氢氧钠沸石膜间生长良好，膜厚为6 ~ 7μm。气体渗透实验结果表明，羟钠沸石膜的氢/正丁烷过选择性大于1000。
A high quality pure hydroxy-sodalite zeolite membrane was successfully synthesized on an α-Al2O3support by a novel microwave-assisted hydrothermal synthesis (MAHS) method. Influence of synthesis conditions, such as synthesis time, synthesis procedure, etc., on the formation of hydroxy-sodalite zeolite membrane by MAHS method was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and gas permeation measurements. The synthesis of hydroxy-sodalite zeolite membrane by MAHS method only needed 45min and synthesis was more than 8 times faster than by the conventional hydrothermal synthesis (CHS) method. A pure hydroxy-sodalite zeolite membrane was easily synthesized by MAHS method, while a zeolite membrane, which consisted of NaX zeolite, NaA zeolite and hydroxy-sodalite zeolite, was usually synthesized by CHS method. The effect of preparation procedures had a dramatic impact on the formation of hydroxy-sodalite zeolite membrane and a single-stage synthesis procedure produced a pure hydroxy-sodalite zeolite membrane. The pure hydroxy-sodalite zeolite membrane synthesized by MAHS method was found to be well inter-grown and the thickness of the membrane was 6–7μm. Gas permeation results showed that the hydrogen/n-butane permselectivity of the hydroxy-sodalite zeolite membrane was larger than 1000.