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

Deepika Malhotra, David C. Cantu, Phillip K. Koech, David J. Heldebrant, Abhijeet Karkamkar, Feng Zheng, Mark D. Bearden, Roger Rousseau, Vassiliki Alexandra Glezakou

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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. Density functional theory calculations and classical molecular dynamic 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 retains high gravimetric capacity (20%) while exhibiting the lowest CO2-rich viscosities (<150 cP, 40 °C) of any 100% concentrated amine currently known. Additionally, these newly identified solvents exhibit regeneration temperatures as low as 60 °C when applying a polarity swing assisted regeneration, resulting in a solvent that can conceptually absorb and desorb CO2 with only a 20 °C temperature swing.

Original languageEnglish
Pages (from-to)7535-7542
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number8
DOIs
Publication statusPublished - Apr 15 2019

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Keywords

  • Acid-base equilibrium
  • Amino-pyridines
  • CO capture
  • Molecular simulations
  • Water-lean

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

Cite this

Malhotra, D., Cantu, D. C., Koech, P. K., Heldebrant, D. J., Karkamkar, A., Zheng, F., Bearden, M. D., Rousseau, R., & Glezakou, V. A. (2019). Directed Hydrogen Bond Placement: Low Viscosity Amine Solvents for CO2 Capture. ACS Sustainable Chemistry and Engineering, 7(8), 7535-7542. https://doi.org/10.1021/acssuschemeng.8b05481