Diffusion and reaction in catalyst pellets with bidisperse pore size distribution
Diffusion and reaction in catalyst pellets with bidisperse pore size distribution
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DOI：
10.1021/ie970613t
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发表时间：
1998-03
影响因子：
4.2
通讯作者：
T. Dogu
中科院分区：
文献类型：
--
作者：
T. Dogu
具有双分散孔结构的催化剂广泛应用于化工行业。在这种催化剂中，微孔颗粒的扩散和反应先在大孔中扩散。宏观和微孔扩散阻力对观察到的线性和非线性速率形式的反应速率、热效应、催化剂失活和双分散催化剂的选择性问题的相对意义在许多已发表的著作中进行了研究。在本文中，对文献中提出的模型进行了回顾，并对所涉及的假设进行了批判性分析。提出了检验运输限制的相对重要性的标准。同时，综述了气体在双分散孔结构固体（如沸石球团和负载型多孔催化剂）中微孔和大孔有效扩散系数的实验技术和实验值。
Catalysts with bidisperse pore structures are extensively used in chemical industries. In such catalysts, diffusion and reaction in the microporous particles are preceded by diffusion in the macropores. The relative significance of macro- and micropore diffusion resistances on the observed reaction rates with linear and nonlinear rate forms, heat effects, catalyst deactivation and selectivity problems in bidisperse catalysts are investigated in number of published works. In this article, a review of the models proposed in the literature is presented together with a critical analysis of assumptions involved. Criteria are presented to test the relative significance of transport limitations. Also, a review of experimental techniques and experimental values of micro- and macropore effective diffusivities of gases in solids with bidisperse pore structures, such as zeolite pellets and supported porous catalysts, is given.