期刊
APPLIED ENERGY
卷 142, 期 -, 页码 221-228出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2014.12.072
关键词
Molecular basket sorbent; CO2 adsorption; Molecular simulation; Monte Carlo; MCM-41; Polyethylenimine
资金
- National Natural Science Foundation of China [51106185]
- NSFC-Guangdong Joint Fund Project [U1034005]
- Nature Science Foundation of Guangdong Province [S2012040007694]
- Fundamental Research Funds for the Central Universities [12lgpy23]
- National Basic Research Program of China [2012CB720404]
Amine-functionalized sorbents prepared by wet impregnation method shows great promises for CO2 capture from real flue gas in power plants. The objective of this work is to understand CO2 adsorption thermodynamics and mechanisms at varied polyethylenimine (PEI) loadings on mesoporous MCM-41 by wet impregnation method using a computational approach for the first time. The structures of PEI/MCM-41 sorbents were optimized using molecular dynamics (MD), and the CO2 adsorption thermodynamics at varied PEI loadings was simulated using Grand Canonical Monte Carlo (GCMC) method. Results showed a good agreement between experiments and simulation. On the surface of the MCM-41, there are high CO2-philic sites for CO2 adsorption, which were firstly covered by PEI molecular. The functionalization groups increased the interactions of the CO2 with more PEI molecular deployed on the surface of the MCM-41, then to the center of the pore. The adsorption performance of the composite sorbents depended on the adsorption cites and the space for CO2 diffusion. The CO2 adsorption thermodynamics and mechanisms at varied PEI loadings shed lights on tuning CO2 capture performance with amine-functionalized sorbents for power plant greenhouse gas control. (C) 2015 Elsevier Ltd. All rights reserved.
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