Measurement of the Effective Diffusivity in Porous Media by the Diffusion Cell Method
Measurement of the Effective Diffusivity in Porous Media by the Diffusion Cell Method
复制标题
扩散池法测量多孔介质中的有效扩散率
DOI：
10.1080/01614949608006458
复制
发表时间：
1996
影响因子：
10.9
通讯作者：
A. Rodrigues
中科院分区：
文献类型：
--
作者：
In;D. Do;A. Rodrigues
半个多世纪以来，多孔介质的有效扩散率在实验和理论处理方面进行了大量的研究[1-4]。有几个原因需要有效扩散系数[5]；例如，在催化剂配方过程中，活性物质可以精确地或以指定的浓度分布在多孔基质或载体上。在非均相反应的实验工作中，需要有效的扩散系数来获得Thiele模量的值，从而确定本征反应动力学。在反应器设计中，需要利用扩散系数来评估Thiele模量，从而帮助预测非均相体系的反应速率。此外，一种简单快速的测试方法可作为催化剂生产过程中的筛选或质量控制程序。*庆南大学化学工程系休假，韩国马山631-701。
Introduction There has been a vast amount of investigation in the field of experimental and theoretical treatments of the effective diffusivity in porous media for more than half of a century [1-4]. The effective diffusivity is required for several reasons [5]; for example, during catalyst formulation, active species can be laid down precisely or with specified concentration profiles on a porous matrix or support. In experimental work on heterogeneous reactions an effective diffusivity is needed to obtain the value of the Thiele modulus and hence to determine the intrinsic reaction kinetics. In reactor design the diffusivity is needed to evaluate the Thiele modulus, which can then be an aid in predicting reaction rates for heterogeneous systems. In addition, a simple and quick testing method could be used as a screening or quality control procedure during catalyst manufacture. ∗ On leave from the Department of Chemical Engineering, Kyungnam University, Masan 631-701, Korea.