交换稀土La^(3+)离子NaX型分子筛的交流电导研究  

THE ACIONIC CONDUCTIVITY OF SODIUM ZEOLITE X WITH DIFFERENT LANTHANUM CONTENTS

作　　者：郝金库[1] 王桂林[1] 崔云平[1] 赵维君[2] 方延铨[2] 张书笈[2] 

机构地区：[1]天津师范大学化学系 [2]南开大学化学系

出　　处：《天津师大学报（自然科学版）》1993年第3期34-37,共4页

基　　金：天津市高教局科研基金资助项目

摘　　要：本文用x-射线衍射、原子吸收光谱、差热热重等方法测定了交换La^(3+)离子后NaX分子筛的物相和组成。用交流阻抗谱测量其离子电导,由电导率随温度的变化,得到了NaX和LaNaX的电导表观活化能为38.8KJ/mol和29.5KJ/mol。讨论了交换La^(3+)离子后对分子筛骨架结构中钠离子分布、落位以及扩散迁移的影响。The phase and constituent of NaX exchanged with La^(3+) have been measured using the X-ray diffraction, atomic absorption spectrum and thermal gravimetry methods. From the ionic conductivity measured using AC impedence analyser and the temperature dependence on conductivity, we obtained the activation energy of NaX and LaNaX was 38.8KJ/mol and 29.5KJ/mol respectively. The correlation between the activation energy and the numbers of Lanthanum ion per unit cell indicates that the lanthanum ion makes a change in distribution of sodium ions that gives a rise to decrease in the activation energy in diffusion of dodium ions in zeolite X.

关 键 词：分子筛 离子电导 镧离子 

分 类 号：TQ424.25[化学工程]