Modeling the Kinetics of Gas Adsorption in Multilayer Porphyrin Films

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• 作者：Alex J. McNaughton ; Alan Dunbar ; William Barford ; Tim H. Richardson
• 刊名：Langmuir
• 出版年：2007
• 出版时间：February 13, 2007
• 年：2007
• 卷：23
• 期：4
• 页码：1759 - 1767
• 全文大小：623K
• 年卷期：v.23,no.4(February 13, 2007)
• ISSN：1520-5827

文摘

A kinetic model is proposed to describe the diffusion and adsorption behavior of gas in multilayer films. Numericalsolutions are attained on time scales of seconds using a finite differencing approximation to the kinetic equations.Predictions of this model are compared to experimental data for the case of NO₂ diffusing through a porphyrin film.The model predicts a binding energy for the NO₂ porphyrin interaction of 0.72 eV. It also predicts that for this systemdiffusion is the limiting factor for the adsorption response time of the film, although the recovery time is determinedby both the diffusion coefficient and NO₂ binding energy. Comparison with experiment gives a predicted diffusioncoefficient of ~10^-14 m²·s^-1.