采用Li-LSX,Ca-LSX为起始物进行离子交换分别制备了Li+、Ca2+混合型LSX,通过ICP-AES,7Li MAS NMR,23Na MAS NMR及静态吸附等检测方法,考察了起始物不同对离子交换限度,离子定位与产品吸附性能的影响.实验结果表明,以Ca-LSX为起始物进行Li交换得到的Li-Ca-LSX最大交换率为31.5%,此时吸附性能最优,氮氧吸附量分别为36.4和5.0mL/g,选择性系数为12.4,且节约了Li的用量.借助NMR结果发现,对吸附性能有直接影响的Li+,除公认SIII位置外,尚有少量SI'亦有较显著作用.
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