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无机材料学报

无机材料学报

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起始物对Li+、Ca2+混合型低硅X型分子筛(LSX)制备及吸附性能的影响

李志良, 支建平, 张玉林   

  1. 中国日用化学工业研究院表面活性剂国家工程研究中心, 太原 030001
  • 收稿日期:2007-10-08 修回日期:2007-12-05 出版日期:2008-09-20 网络出版日期:2008-09-20

Effects of Different Starting Materials on Preparation and Adsorption Properties of the Mixed Li+ and Ca2+ Exchanged Low Silica X-type Zeolites(LSX)

LI Zhi-Liang, ZHI Jian-Ping, ZHANG Yu-Lin   

  1. China Research Institute of Daily Chemical Industry, National Engineering Research Center of Surfactant, Taiyuan 030001, China
  • Received:2007-10-08 Revised:2007-12-05 Published:2008-09-20 Online:2008-09-20

PDF (PC)

1760

被引次数

4

摘要： 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.

关键词: 低硅X型分子筛(LSX), 起始物, 离子定位, 吸附性能

Abstract: Mixed ion exchanged Li-Ca-LSX were prepared respectively from the starting materials Li-LSX and Ca-LSX and effects of the difference on ion exchanging degree, ion location and adsorption properties were investigated via the measurements of ICP-AES, 7Li MAS NMR, 23Na MAS NMR and static adsorption method. The results show that the Li-Ca-LSX prepared from Ca-LSX as the starting material reaches the exchange maximum by 31.5% and the best properties, namely the specific adsorption capacity at 36.4mL/g for N2 and 5.0mL/g for O2; and the N2/O2 adsorption selectivity at 12.4. From the results of NMR, it is found that excepting the well-known site SIII, some Li+ locating at the site SI’ can also affect significantly on the adsorption properties of LSX.

Key words: low silica X-type zeolite(LSX), starting materials, ion location, specific adsorption capacity

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