Reaction kinetics and mechanism between histidine and carbon dioxide

G Hu; KH Smith; L Liu; SE Kentish; GW Stevens

Journal article

Reaction kinetics and mechanism between histidine and carbon dioxide

G Hu, KH Smith, L Liu, SE Kentish, GW Stevens

Chemical Engineering Journal | ELSEVIER SCIENCE SA | Published : 2017

DOI: 10.1016/j.cej.2016.08.066

Abstract

Amino acids are considered as potential solvents for carbon dioxide (CO2) capture. In this research, the reaction kinetics and reaction mechanism between histidine and CO2 were investigated. Results showed that histidine anion ions (His–) are the main species reacting with CO2 in basic conditions (pH > 9) with a reaction order of 1.18 ± 0.08 across the temperature range of 298–313 K. The zwitterion mechanism was used to fit the kinetic data and it showed that both protonation and deprotonation reactions contributed to the overall reaction rate. Ionic strength was also shown to have a significant influence on the reaction kinetics when the histidine concentration is high (⩾0.2 M). The reactio..

View full abstract

University of Melbourne Researchers

Guoping Hu Author

Kathryn Smith Author

Sandra Kentish Author

Geoff Stevens Author

Grants

Funding Acknowledgements

The authors acknowledge the financial support provided by the Australian Government through its Cooperative Research Center program for this CO2CRC research project. Infrastructure support from the Particulate Fluids Processing Center (PFPC), a Special Research Center of the Australian Research Council is gratefully acknowledged. The Peter Cook Centre (PCC) for Carbon Capture and Storage (CCS) Research is also gratefully acknowledged.