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Energies 2017, 10(1), 115; doi:10.3390/en10010115

Desorption Kinetics and Mechanisms of CO2 on Amine-Based Mesoporous Silica Materials

Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
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Academic Editor: Fernando Rubiera González
Received: 15 November 2016 / Revised: 3 January 2017 / Accepted: 5 January 2017 / Published: 18 January 2017
(This article belongs to the Special Issue CO2 Capture)
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Abstract

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. View Full-Text
Keywords: amine modified MCM-41; desorption kinetics; zero length column; Avrami’s fractional model; intraparticle diffusion; film diffusion amine modified MCM-41; desorption kinetics; zero length column; Avrami’s fractional model; intraparticle diffusion; film diffusion
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Teng, Y.; Liu, Z.; Xu, G.; Zhang, K. Desorption Kinetics and Mechanisms of CO2 on Amine-Based Mesoporous Silica Materials. Energies 2017, 10, 115.

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