Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control

Brzic Danica V.; Petkovska Menka T.

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Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control

机译：非线性频率响应分析作为用于识别吸附动力学的工具：案例研究 - 孔隙表面扩散控制

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In the present paper, the Nonlinear Frequency Response (NFR) analysis is applied for theoretical study of kinetics of adsorption governed by pore-surface diffusion. The concept of higher-order frequency response functions (FRFs) is used. Based on a nonlinear mathematical model for adsorption of pure gas and spherical adsorbent particles, the theoretical first-and second-order FRFs, which relate the adsorbate concentration in the particle to the surrounding pressure (F-1 (omega) and F-2 (omega,omega)), have been derived. The obtained FRFs have been simulated for different steady-state pressures and different ratios (between zero and one) of surface to pore diffusion coefficients. The results show that, unlike F-1 (omega), F-2 (omega,omega) exhibits features which unambiguously distinguish the pore-surface diffusion model from pure pore diffusion and micropore diffusion. Based on the characteristic features of F-1 (omega) and F-2 (omega,omega), a new methodology for direct estimation of the separate values of the pore and surface diffusion coefficients has been established.

机译：在本文中，应用非线性频率响应（NFR）分析用于通过孔隙表面扩散治理的吸附动力学的理论研究。使用高阶频率响应函数（FRFS）的概念。基于用于吸附纯气体和球形吸附剂颗粒的非线性数学模型，理论上的第一和二阶FRF，其将颗粒中的吸附物浓度与周围压力（F-1（OMEGA）和F-2（ omega，omega）已被派生。已经为所获得的FRFS模拟用于不同的稳态压力和表面的不同比率（在零和一）到孔扩散系数。结果表明，与F-1（OMEGA）不同，F-2（OMEGA，OMEGA）表现出明确地区分纯孔扩散和微孔扩散的特征。基于F-1（OMEGA）和F-2（OMEGA，OMEGA）的特征，已经建立了一种用于直接估计孔和表面扩散系数的单独值的新方法。

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《Mathematical Problems in Engineering》 |2019年第12期|7932967.1-7932967.11|共11页
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Brzic Danica V.; Petkovska Menka T.;
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Univ Belgrade Fac Technol & Met Dept Chem Engn Belgrade 11000 Serbia;

Univ Belgrade Fac Technol & Met Dept Chem Engn Belgrade 11000 Serbia;

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机译：非线性频率响应分析作为用于识别吸附动力学的工具：案例研究 - 孔隙表面扩散控制
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Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control

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