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An experimental/computational study of steric hindrance effects on CO2 absorption in (non)aqueous amine solutions |
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| Authors: | Qinlan Luo Rui Dong Bohak Yoon Hongxia Gao Mengjie Chen Gyeong S Hwang Zhiwu Liang |
| Affiliation: | 1. Joint International Center for CO2 Capture and Storage (iCCS), Hunan Provincial Key Laboratory for Cost-Effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, Changsha, PR China
Contribution: Conceptualization (lead), Visualization (lead), Writing - original draft (lead);2. Joint International Center for CO2 Capture and Storage (iCCS), Hunan Provincial Key Laboratory for Cost-Effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, Changsha, PR China Contribution: Formal analysis (equal), Investigation (lead);3. McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, USA Contribution: Software (lead), Writing - review & editing (supporting);4. Joint International Center for CO2 Capture and Storage (iCCS), Hunan Provincial Key Laboratory for Cost-Effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, Changsha, PR China;5. Joint International Center for CO2 Capture and Storage (iCCS), Hunan Provincial Key Laboratory for Cost-Effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, Changsha, PR China Contribution: Data curation (equal), Investigation (equal);6. McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, USA Contribution: Resources (equal), Supervision (equal) |
| Abstract: | The reaction kinetics and molecular mechanisms of CO2 absorption using nonaqueous and aqueous monoethanolamine (MEA)/methyldiethanolamine (MDEA)/2-amino-2-methy-1-propanol (AMP) solutions were analyzed by the stopped-flow technique and ab initio molecular dynamics (AIMD) simulations. Pseudo first-order rate constants (k0) of reactions between CO2 and amines were measured. A kinetic model was proposed to correlate the k0 to the amine concentration, and was proved to perform well for predicting the relationship between k0 and the amine concentration. The experimental results showed that AMP/MDEA only took part in the deprotonation of MEA-zwitterion in nonaqueous MEA + AMP/MEA + MDEA solutions. In aqueous solutions, AMP can also react with CO2 through base-catalyzed hydration mechanism beside the zwitterion mechanism. Molecular mechanisms of CO2 absorption were also explored by AIMD simulations coupled with metadynamics sampling. The predicted free-energy barriers of key elementary reactions verified the kinetic model and demonstrated the different molecular mechanisms for the reaction between CO2 and AMP. |
| Keywords: | ab initio molecular dynamics CO2 absorption mechanism kinetic model reaction kinetics steric hindrance |