New approximate model for nonlinear adsorption and concentration dependent surface diffusion in a single particle

被引：15

作者：

Botte, GG ^{[1
]}

Zhang, R ^{[1
]}

Ritter, JA ^{[1
]}

机构：

[1] Univ S Carolina, Swearingen Engn Ctr, Dept Chem Engn, Columbia, SC 29208 USA

来源：

ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY | 1999年 / 5卷 / 04期

基金：

美国国家科学基金会;

关键词：

langmuir isotherm; parabolic profile; pore diffusion; concentration dependent surface diffusion; HIO;

D O I：

10.1023/A:1008960716126

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new approximate model for nonlinear adsorption (Langmuir model) and concentration dependent surface diffusion (HIO model) in a single particle was derived, based on a parabolic concentration profile assumption for the summation of the gas and adsorbed phases. The surface diffusivity was approximated with the adsorbed phase concentration evaluated at the surface of the particle, as the average of the adsorbed phase concentration, and as the average of the first two approximations. Overall, the approximate model based on the average of the first two approximations compared the best with the exact solution for a wide variety of systems and conditions.

引用

页码：373 / 380

页数：8

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