Use of nonlinear frequency response for discriminating adsorption kinetics mechanisms resulting with bimodal characteristic functions
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2003
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One of the characteristic examples of the inability of the classical linear frequency response (FR) method to identify the correct kinetic mechanism is adsorption of some substances (p-xylene, 2-butane, propane or n-hexane) on silicalite-1. The linear FR resulted with bimodal FR characteristic functions, which fitted equally well to three different kinetic models: nonisothermal micropore diffusion, two independent isothermal diffusion processes, and an isothermal diffusion-rearrangement process. We show that the second order frequency response functions (FRFs), obtained from the nonlinear FR, can be used for discrimination among these three mechanisms. Starting from the nonlinear models, we derive the theoretical expressions for the first and second order FRFs corresponding to these three mechanisms and show that different shapes of the second order FRFs are obtained for each mechanism. This would enable identification of the real mechanism from nonlinear FR data.
Ključne reči:
nonlinear mathematical models / nonlinear frequency response method / bimodal characteristic functions / isothermal and nonisothermal modelsIzvor:
Adsorption-Journal of the International Adsorption Society, 2003, 9, 2, 133-142Izdavač:
- Springer, New York
DOI: 10.1023/A:1024241326422
ISSN: 0929-5607
WoS: 000183484400004
Scopus: 2-s2.0-0038783655
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Petkovska, Menka AU - Petkovska, Ljubica T. PY - 2003 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/525 AB - One of the characteristic examples of the inability of the classical linear frequency response (FR) method to identify the correct kinetic mechanism is adsorption of some substances (p-xylene, 2-butane, propane or n-hexane) on silicalite-1. The linear FR resulted with bimodal FR characteristic functions, which fitted equally well to three different kinetic models: nonisothermal micropore diffusion, two independent isothermal diffusion processes, and an isothermal diffusion-rearrangement process. We show that the second order frequency response functions (FRFs), obtained from the nonlinear FR, can be used for discrimination among these three mechanisms. Starting from the nonlinear models, we derive the theoretical expressions for the first and second order FRFs corresponding to these three mechanisms and show that different shapes of the second order FRFs are obtained for each mechanism. This would enable identification of the real mechanism from nonlinear FR data. PB - Springer, New York T2 - Adsorption-Journal of the International Adsorption Society T1 - Use of nonlinear frequency response for discriminating adsorption kinetics mechanisms resulting with bimodal characteristic functions EP - 142 IS - 2 SP - 133 VL - 9 DO - 10.1023/A:1024241326422 ER -
@article{ author = "Petkovska, Menka and Petkovska, Ljubica T.", year = "2003", abstract = "One of the characteristic examples of the inability of the classical linear frequency response (FR) method to identify the correct kinetic mechanism is adsorption of some substances (p-xylene, 2-butane, propane or n-hexane) on silicalite-1. The linear FR resulted with bimodal FR characteristic functions, which fitted equally well to three different kinetic models: nonisothermal micropore diffusion, two independent isothermal diffusion processes, and an isothermal diffusion-rearrangement process. We show that the second order frequency response functions (FRFs), obtained from the nonlinear FR, can be used for discrimination among these three mechanisms. Starting from the nonlinear models, we derive the theoretical expressions for the first and second order FRFs corresponding to these three mechanisms and show that different shapes of the second order FRFs are obtained for each mechanism. This would enable identification of the real mechanism from nonlinear FR data.", publisher = "Springer, New York", journal = "Adsorption-Journal of the International Adsorption Society", title = "Use of nonlinear frequency response for discriminating adsorption kinetics mechanisms resulting with bimodal characteristic functions", pages = "142-133", number = "2", volume = "9", doi = "10.1023/A:1024241326422" }
Petkovska, M.,& Petkovska, L. T.. (2003). Use of nonlinear frequency response for discriminating adsorption kinetics mechanisms resulting with bimodal characteristic functions. in Adsorption-Journal of the International Adsorption Society Springer, New York., 9(2), 133-142. https://doi.org/10.1023/A:1024241326422
Petkovska M, Petkovska LT. Use of nonlinear frequency response for discriminating adsorption kinetics mechanisms resulting with bimodal characteristic functions. in Adsorption-Journal of the International Adsorption Society. 2003;9(2):133-142. doi:10.1023/A:1024241326422 .
Petkovska, Menka, Petkovska, Ljubica T., "Use of nonlinear frequency response for discriminating adsorption kinetics mechanisms resulting with bimodal characteristic functions" in Adsorption-Journal of the International Adsorption Society, 9, no. 2 (2003):133-142, https://doi.org/10.1023/A:1024241326422 . .