Why does the Linear Driving Force model for adsorption kinetics work?
Why does the Linear Driving Force model for adsorption kinetics work?
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DOI：
10.1023/a:1008965317983
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发表时间：
2000-06-01
影响因子：
3.3
通讯作者：
Hufton, JR
中科院分区：
文献类型：
--
作者：
Sircar, S;Hufton, JR
气体吸附动力学的线性驱动力（LDF）模型因其简单、解析性强、物理相容性好等特点，常被成功地用于吸附柱动态数据的分析和吸附过程的设计。然而，有一个很大的差异，吸附剂颗粒上的LDF和更严格的Fickian扩散（FD）模型的等温批量摄取曲线的特性。它表明，通过使用简单的模型系统，在单一的孔或吸附剂颗粒水平的吸附动力学的特性丢失在（a）评估整体吸收上的非均质多孔固体，（B）计算穿透曲线从填充吸附柱，和（c）建立分离效率的吸附过程中，由于重复平均的基本动力学性质。这就是为什么LDF模式在实践中有效。
The Linear Driving Force (LDF) model for gas adsorption kinetics is frequently and successfully used for analysis of adsorption column dynamic data and for adsorptive process designs because it is simple, analytic, and physically consistent. Yet, there is a substantial difference in the characteristics of isothermal batch uptake curves on adsorbent particles by the LDF and the more rigorous Fickian Diffusion (FD) model. It is demonstrated by using simple model systems that the characteristics of the adsorption kinetics at the single pore or the adsorbent particle level are lost in (a) evaluating overall uptake on a heterogeneous porous solid, (b) calculating breakthrough curves from a packed adsorbent column, and (c) establishing the efficiency of separation by an adsorptive process due to repeated averaging of the base kinetic property. That is why the LDF model works in practice.