LAPSE:2019.0775
Published Article
LAPSE:2019.0775
Desorption Kinetics and Mechanisms of CO₂ on Amine-Based Mesoporous Silica Materials
Yang Teng, Zhilin Liu, Gang Xu, Kai Zhang
July 26, 2019
Tetraethylenepentamine (TEPA)-based mesoporous MCM-41 is used as the adsorbent to determine the CO₂ desorption kinetics of amine-modified materials after adsorption. The experimental data of CO₂ desorption as a function of time are derived by zero-length column at different temperatures (35, 50, and 70 °C) and analyzed by Avrami’s fractional-order kinetic model. A new method is used to distinguish the physical desorption and chemical desorption performance of surface-modified mesoporous MCM-41. The activation energy Ea of CO₂ physical desorption and chemical desorption calculated from Arrhenius equation are 15.86 kJ/mol and 57.15 kJ/mol, respectively. Furthermore, intraparticle diffusion and Boyd’s film models are selected to investigate the mechanism of CO₂ desorption from MCM-41 and surface-modified MCM-41. For MCM-41, there are three rate-limiting steps during the desorption process. Film diffusion is more prominent for the CO₂ desorption rates at low temperatures, and pore diffusion mainly governs the rate-limiting process under higher temperatures. Besides the surface reaction, the desorption process contains four rate-limiting steps on surface-modified MCM-41.
Keywords
amine modified MCM-41, Avrami’s fractional model, desorption kinetics, film diffusion, intraparticle diffusion, zero length column
Suggested Citation
Teng Y, Liu Z, Xu G, Zhang K. Desorption Kinetics and Mechanisms of CO₂ on Amine-Based Mesoporous Silica Materials. (2019). LAPSE:2019.0775
Author Affiliations
Teng Y: Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
Liu Z: Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
Xu G: Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
Zhang K: Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
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Journal Name
Energies
Volume
10
Issue
1
Article Number
E115
Year
2017
Publication Date
2017-01-18
Published Version
ISSN
1996-1073
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PII: en10010115, Publication Type: Journal Article
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LAPSE:2019.0775
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doi:10.3390/en10010115
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Jul 26, 2019
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Calvin Tsay
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