Effect of Cation Exchange on Hydrogen Adsorption Property of Mordenite for Isotope Separation
Effect of Cation Exchange on Hydrogen Adsorption Property of Mordenite for Isotope Separation
复制标题
阳离子交换对丝光沸石同位素分离氢吸附性能的影响
DOI：
10.1016/j.jnucmat.2012.11.003
复制
发表时间：
2012
影响因子：
3.1
通讯作者：
T. Yamanishi
中科院分区：
文献类型：
--
作者：
Y. Kawamura;Y. Iwai;K. Munakata;T. Yamanishi
沸石很容易将其阳离子交换成另一种阳离子。因此，孔径很容易改变。阳离子交换丝光沸石（莫尔）在高于77 K的温度下具有较好的同位素分离能力。然而，吸附容量，吸附速率，阳离子品种，阳离子交换比之间的相关性还没有明确指出。在这项工作中，合成丝光沸石型沸石（Na-MOR）的阳离子（Na+）被碱金属离子或碱土金属离子（例如，Li+、K+、Mg 2+和Ca 2+）。在77 K、159 K、175 K和195 K下考察了H2和D2的吸附性能。在低压范围内，Li-MOR和Ca-MOR的吸附量大于Na-MOR，而K-MOR的吸附量则小于Na-MOR。微孔尺寸表明，只有K-MOR明显向较小尺寸转变。在碱金属的情况下，具有较低原子序数的阳离子可导致增加的吸附容量。
Zeolite easily exchanges its cation to another. As a result, pore size changes easily. Cation-exchanged mordenite type zeolite (MOR) has been reported to have comparatively good isotope separation capability at temperatures higher than 77 K. However, correlations between adsorption capacities, adsorption rate, cation variety, and cation exchange ratio have not been clearly indicated. In this work, the cation (Na+) of synthetic mordenite type zeolite (Na-MOR) was exchanged by alkaline metal ion or alkaline earth ion (e.g., Li+, K+, Mg2+and Ca2+). Then, adsorption capacities of H2and D2were investigated at 77 K, 159 K, 175 K and 195 K. Adsorption capacities on Li-MOR and Ca-MOR became larger than that of Na-MOR at a low-pressure range, while that of K-MOR became smaller. Micro-pore size indicated that only K-MOR was clearly shifting to smaller size. In the case of alkaline metal, cations with lower atomic numbers may lead to increased adsorption capacities.