June 19, 2019
Journal Article

Directed Hydrogen Bond Placement: Low Viscosity Amine Solvents for CO2 Capture

Deepika Malhotra
David Cantu Cantu
Phillip Koech
David Heldebrant
Abhijeet Karkamkar
Feng Zheng
Mark Bearden
Roger Rousseau
Vassiliki-Alexandra Glezakou
Capture of CO2 from power generation is required for its conversion or sequestration. Toward this goal, numerous CO2 capture processes have been developed, with the most widely deployed technology utilizing aqueous solutions of amines. Our group has focused on the design of several classes of water-lean solvents in order to identify molecular-level descriptors to control materials properties such as viscosity and regeneration energy. Large scale molecular simulations have shown that strategic placement of hydrogen bonding and tuning of the acid/base equilibria are critical for controlling viscosity at CO2-rich loadings. Here, we extend these principles to a new class of pyridine-based molecules with a secondary amine functionality for binding CO2. The result is a class of water-lean amines that retain high gravimetric capacity (20%) while exhibiting the lowest CO2-rich viscosities (

Revised: June 19, 2019 | Published: April 15, 2019

Malhotra D., D. Cantu Cantu, P.K. Koech, D.J. Heldebrant, A.J. Karkamkar, F. Zheng, and M.D. Bearden, et al. 2019. "Directed Hydrogen Bond Placement: Low Viscosity Amine Solvents for CO2 Capture." ACS Sustainable Chemistry & Engineering 7, no. 8:7535-7542. PNNL-SA-139613. doi:10.1021/acssuschemeng.8b05481