异形催化剂效率因子的数值计算  

Numerical Calculation of Effectiveness Factors of Non-Cylindrical Catalyst Particles

作　　者：赵毅[1] 葛世英[1] 蔡云升[1] 李盘生[1] 

机构地区：[1]华东化工学院化学工程系

出　　处：《华东化工学院学报》1989年第6期706-711,共6页

基　　金：中国科学院自然科学基金

摘　　要：推导了用有限差分方程计算催化剂颗粒效率因子的方法,并计算了几种异形催化剂(三叶草形,圆柱形,五叶形,环形)的效率因子。计算结果表明:三叶草形催化剂在化学反应中的内扩散性能大大优于圆柱形;对于颗粒内扩散控制的催化反应过程,采用异形催化剂可以显著提高表观反应速度;在体积相同的条件下,四种形状催化剂的效率因子的大小为:环形>三叶草形>五叶形>圆柱形。提出了形状对效率因子影响的估值不等式。The effectiveness factors of extruded catalysts of four different shapes were calculated numerically by finite difference method. The results of calculation show that the three-lobed catalyst is much better than cylindrical-shaped in diffusion behavior. When intra-particle diffusion limitation is important, the use of non-cylindrical catalysts can increase superficial reaction rate markedly. An evaluation inequality about the effect of catalyst shape on the effectiveness factor of catalyst is proposed.

关 键 词：催化剂 效率因子 有限差分 

分 类 号：O31[理学—一般力学与力学基础]