DIFFUSION OF OXYGEN AND NITROGEN IN 5A ZEOLITE CRYSTALS AND COMMERCIAL 5A PELLETS

被引：74

作者：

RUTHVEN, DM

XU, Z

机构：

[1] Department of Chemical Engineering, University of New Brunswick, Fredericton, NB E3B 5A3

来源：

CHEMICAL ENGINEERING SCIENCE | 1993年 / 48卷 / 18期

关键词：

D O I：

10.1016/0009-2509(93)80214-B

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The diffusion of oxygen and nitrogen in large laboratory synthesized crystals of 5A zeolite and in commercial 5A adsorbent pellets was studied by the zero length column (ZLC) method. The data clearly show that intracrystalline diffusion is much too fast to exert any significant influence on the sorption kinetics in the commercial adsorbent and the dominance of macropore diffusional resistance was confirmed by replicate experiments with different particle size fractions. At subambient temperatures surface diffusion makes a significant contribution to the macro diffusivity. especially for nitrogen, leading to interesting trends for the concentration and temperature dependence. These effects are analyzed in detail.

引用

页码：3307 / 3312

页数：6