高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (6): 809.

• 论文 • 上一篇    下一篇

不同硅铝比Y型沸石的稀土离子交换平衡

张毓青, 杜金洲, 赵爱民, 李全昌, 陶祖贻   

  1. 兰州大学现代物理系, 兰州, 730000
  • 收稿日期:1990-01-15 出版日期:1991-06-24 发布日期:1991-06-24
  • 通讯作者: 陶祖贻

Rare Earth Ion Exchange Equilibria in Y Zeolites with Varying Ratios of SiO2/Al2O3

Zhang Yu-qing, Du Jin-zhou, Zhao Ai-min, Li Quan-chang, Tao Zu-yi   

  1. Department of Modern Physics, Lanzhou University, Lanzhou, 730000
  • Received:1990-01-15 Online:1991-06-24 Published:1991-06-24

摘要: 测定了4种不同硅铝比Y型沸石在303和333K下的N→Tb离子交换等温线,求得了热力学平衡常数,标准自由能、焓、熵三者的改变量以及沸石相中各组分的活度系数和超额自由能函数,研究了这些数值随硅铝比变化的规律。用双电层理论解释了所得的结果。

关键词: 沸石, 离子交换, 平衡

Abstract: Four Yzeolites with varying ratios of SiO2/Al2O3 were prepared. Athermodynamic study was made on the Na→Tb exchange reactions in these zeolites at 303 and 333 K. The thermodynamic equilibrium constants lnK., the standard free energy decreases -△G°, the standard enthalpy changes △H°,the standard entropy changes △S°of the exchange, and the activity coefficients and the excess free energies in the zeolites were determined. The dependences of these values on the charge density are reasonably explained by the double electric layer theory.

Key words: Zeolite, Ion exchange, Equilibrium

TrendMD: