文献类型：期刊文献

中文题名：随机游动法研究沸石晶内扩散

英文题名：Study on Intracrystalline Diffusion in Zeolite with Random Walk Method

作者：柏子龙[1];陈绍洲[1];刘馥英[1]

机构：[1]华东化工学院石油加工研究所

年份：1991

卷号：17

期号：2

起止页码：166

中文期刊名：华东化工学院学报

收录：国家哲学社会科学学术期刊数据库;Scopus;CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：沸石;孔结构;催化;随机游动法;晶内扩散

外文关键词：zeolite; diffusion; pore structure; catalysis; random walk

摘要：用随机游动方法研究了在简化的二维网络中的扩散过程,考察了沸石晶内的两种孔堵塞分布和晶内次级孔道对扩散的影响。结果表明,无因次晶内扩散系数随孔堵塞率的增加而迅速下降。对均匀孔堵塞分布,这是由于孔堵塞破坏了晶内的连续性网络;而对边缘孔堵塞分布则是由于减少了整个网络对外界通道的开放程度。沸石晶内次级孔的存在可以大大改善扩散性能,次级孔百分数与扩散系数之间有良好的线性关系。
The effects of random blocking of intracrystalline pores and intracrystalline secondary pores in zeolite on dimensionless effective diffusivity are investigated with the method of a random walk process in a finite, two-dimensional network of pores. The diffusivity decreases rapidly when the percentage of pore blocked increases, because the continuity of the network is damaged in case of bulk pore blocking and the degree of connection between the network and surroundings drops in case of border sites blocking. The secondary pore can improve the intracrystalline diffusion. The behavior of effective intracrystalline diffusivity vs percentage of secondary pores is of linear relation.