skip to main content


Title: Enhancements in mass transfer for carbon capture solvents part I: Homogeneous catalyst

The novel small molecule carbonic anhydrase (CA) mimic [Co III(Salphen-COO -)Cl]HNEt 3 ( 1), was synthesized as an additive for increasing CO 2 absorption rates in amine-based post-combustion carbon capture processes (CCS), and its efficacy was verified. 1 was designed for use in a kinetically slow but thermally stable blended solvent, containing the primary amines 1-amino-2-propanol (A2P) and 2-amino-2-methyl-1-propanol (AMP). Together, the A2P/AMP solvent and 1 reduce the overall energy penalty associated with CO 2 capture from coal-derived flue gas, relative to the baseline solvent MEA. 1 is also effective at increasing absorption kinetics of kinetically fast solvents, such as MEA, which can reduce capital costs by requiring a smaller absorber tower. The transition from catalyst testing under idealized laboratory conditions, to process relevant lab- and bench-scale testing adds many additional variables that are not well understood and rarely discussed. As a result, the stepwise testing of both 1 and the novel A2P/AMP solvent blend is described through a transition process that identifies many of these process and evaluation challenges not often addressed when designing a chemical or catalytic additive for industrial CCS systems, where consideration of solvent chemistry is typically the primary goal.
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Kentucky, Lexington, KY (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
International Journal of Greenhouse Gas Control
Additional Journal Information:
Journal Volume: 63; Journal Issue: C; Journal ID: ISSN 1750-5836
Research Org:
Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
01 COAL, LIGNITE, AND PEAT; Post-combustion; CO2 capture; Mass transfer; Amine; Catalyst; Additives
OSTI Identifier: