Directed Hydrogen Bond Placement

Low Viscosity Amine Solvents for CO 2 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

Abstract

Capture of CO 2 from power generation is required for its conversion or sequestration. Toward this goal, numerous CO 2 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 CO 2 -rich loadings. Here, we extend these principles to a new class of pyridine-based molecules with a secondary amine functionality for binding CO 2 . The result is a class of water-lean amines that retains high gravimetric capacity (20%) while exhibiting the lowest CO 2 -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 CO 2 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

Fingerprint

Carbon Monoxide
Amines
Hydrogen bonds
viscosity
hydrogen
Viscosity
regeneration
power generation
Pyridine
Power generation
Density functional theory
Molecular dynamics
Water
Materials properties
aqueous solution
Tuning
temperature
water
Temperature
Molecules

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., ... Glezakou, V. A. (2019). Directed Hydrogen Bond Placement: Low Viscosity Amine Solvents for CO 2 Capture. ACS Sustainable Chemistry and Engineering, 7(8), 7535-7542. https://doi.org/10.1021/acssuschemeng.8b05481

Directed Hydrogen Bond Placement : Low Viscosity Amine Solvents for CO 2 Capture. / Malhotra, Deepika; Cantu, David C.; Koech, Phillip K.; Heldebrant, David J.; Karkamkar, Abhijeet; Zheng, Feng; Bearden, Mark D.; Rousseau, Roger; Glezakou, Vassiliki Alexandra.

In: ACS Sustainable Chemistry and Engineering, Vol. 7, No. 8, 15.04.2019, p. 7535-7542.

Research output: Contribution to journalArticle

Malhotra, D, Cantu, DC, Koech, PK, Heldebrant, DJ, Karkamkar, A, Zheng, F, Bearden, MD, Rousseau, R & Glezakou, VA 2019, 'Directed Hydrogen Bond Placement: Low Viscosity Amine Solvents for CO 2 Capture', ACS Sustainable Chemistry and Engineering, vol. 7, no. 8, pp. 7535-7542. https://doi.org/10.1021/acssuschemeng.8b05481
Malhotra, Deepika ; Cantu, David C. ; Koech, Phillip K. ; Heldebrant, David J. ; Karkamkar, Abhijeet ; Zheng, Feng ; Bearden, Mark D. ; Rousseau, Roger ; Glezakou, Vassiliki Alexandra. / Directed Hydrogen Bond Placement : Low Viscosity Amine Solvents for CO 2 Capture. In: ACS Sustainable Chemistry and Engineering. 2019 ; Vol. 7, No. 8. pp. 7535-7542.
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