交换La^3＋对NaX型分子筛Na^＋电导的影响

用X-射线衍射、原子吸收、差热热重、化学分析等方法测定了交换La3 离子NaX型分子筛的物相及组成。用交流阻抗谱仪测量了其离子电导。由电导率随温度的变化得到NaX的Na 电导表观活化能为38．8kJ／mol，适度交换La3 ，NaLaX的Na 电导表观活化能降低至27．9kJ/mol。讨论了交换La3 对分子筛中Na 迁移扩散的影响。

THE AC IONIC CONDUCTIVITY OF SODIUM ZEOLITE X WITH DIFFERENT LANTHANUM CONTEUTS

The phase and constituent of NaX zeolite with different lanthanum contents have been measured using X-ray diffroetion, atomic absorption spectrum and thermal gravimetry methods. From the ionic conductivity measured using AC impedence analyser and temperature dependence on conductiviry, we obtained the activation energy of NaX and LaNaX. It was 38. 8kJ/mol and 27. 9kJ/mol respectively. The corelation between the activation energy and the numbers of lanthanum ion per unit cell indicates that the lanthanum ion can form a kind of La-O cluster to reduce interaction force that gives a rise to decrease in the activation energy in diffusion of sodium in zeolite X.