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Use of Higher-Order Frequency Response Functions for Identification of Nonlinear Adsorption Kinetics: Single Mechanisms under Isothermal Conditions

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Abstract

The concept of higher-order frequency response functions(FRFs), which is based on Volterra series expansion of nonlinearfunctions, is used for analysis of kinetics of nonlinear adsorptionsystems. Four different kinetic mechanisms: Langmuir kinetics, filmresistance control, micropore diffusion control and pore-surfacediffusion control were analyzed and the results were compared. It wasshown that, contrary to the linear frequency response characteristicfunctions, the higher-order FRFs corresponding to different mechanismsdiffer in shape. This result offers great potential for theidentification of the adsorption-diffusion mechanism governing theprocess. It is shown that the second order FRFs give sufficientinformation for distinguishing different mechanisms.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Queensland, St. Lucia, QLD, 4072, Australia

    Menka Petkovska & Duong D. Do

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  1. Menka Petkovska
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  2. Duong D. Do
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Petkovska, M., Do, D.D. Use of Higher-Order Frequency Response Functions for Identification of Nonlinear Adsorption Kinetics: Single Mechanisms under Isothermal Conditions. Nonlinear Dynamics 21, 353–376 (2000). https://doi.org/10.1023/A:1008342419693

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