Synthesis of zeolite membranes and their separation properties.
Synthesis of zeolite membranes and their separation properties.
复制标题
沸石膜的合成及其分离性能。
DOI：
10.5360/membrane.19.171
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
H. Yanagishita
中科院分区：
文献类型：
--
作者：
T. Sano;Y. Kawakami;Y. Kiyozumi;H. Yanagishita
沸石和分子筛是催化、离子交换和吸附等方面非常有用的材料。近年来，沸石膜由于其均匀的孔径和耐高温的特性引起了人们的极大兴趣。从了解沸石晶体生长过程的角度来看，这种膜也很有趣。Al沿膜宽的分布和形貌变化反映了晶体生长的时间过程，通过分析所得到的膜可以得到晶体生长过程的很多信息。根据所得结果，发现沸石多晶膜是通过沸石晶体的连续积累形成的，在沸石初始结晶过程中，生成了高SiO2/Al2O3比的沸石晶体。采用渗透汽化的方法，研究了在多孔烧结不锈钢和氧化铝载体上制备的多晶硅石膜的液体分离电位。膜内除了存在直径约0.6 nm的硅质孔洞外，还存在直径约1 nm的由晶粒形成的孔洞，表现出较高的醇透选择性。对水和醇的吸附实验表明，膜对醇的选择性吸附是膜对醇的选择性吸附的结果。
Zeolite and molecular sieves are know to be very useful materials for catalysis, ion exchange and adsorption. Recently, great interest has been focused on zeolite membranes due to their uniform pore sizes and resistance to high temperatures. The membranes are also interesting from the standpoint of understanding of growth process of zeolite crystals. As the Al distribution and the change in morphology along the width of membrane reflect the time course of the crystal growth, we can get much information regarding the crystal growth process by analyzing the membrane obtained. Based on the results obtained, it was found that the polycrystalline zeolite membranes are formed through a successive accumulation of zeolite crystals and that during the initial crystallization of zeolite, the zeolite crystals with the high SiO2/Al2O3 ratios are generated.The liquid separation potential of the polycrystalline silicalite membranes prepared on porous sintered stainless steel and alumina supports was investigated using various alcohol/water mixtures by pervaporation. The membrane showed a high alcohol permselectivity, although there were pores of ca. 1 nm diameter, which were originated from crystal grains, other than intrinsic silicalite pores of ca. 0.6 nm within the membrane. Adsorption experiments of water and alcohols suggest that the high alcohol permselectivity is attributable to the selective sorption of alcohol into the membrane.