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Selection of solvents for integrated CO2 absorption and electrochemical reduction systems

Journal Article · · AIChE Journal
DOI:https://doi.org/10.1002/aic.18734· OSTI ID:2550704
 [1];  [2];  [3];  [2];  [2];  [4];  [4];  [1]
  1. Centre for Research and Technology Hellas (CERTH), Thessaloniki (Greece)
  2. Idaho National Laboratory (INL), Idaho Falls, ID (United States)
  3. Aristotle Univ. of Thessaloniki (Greece)
  4. Centre for Research and Technology Hellas (CERTH), Thessaloniki (Greece); Aristotle Univ. of Thessaloniki (Greece)
+ Show Author Affiliations
Solvent-based electrochemical CO2 reduction (CO2R) enables the production of chemicals or fuels using CO2 from a preceding absorption process. Employing previously tested CO2 capture solvents does not ensure their suitability for either CO2R or integrated CO2 absorption-reduction. We propose solvent selection criteria that include the CO2 solubility, kinetic constant, ionic conductivity, concentration of the bicarbonate, carbamate, and solvent cation in the CO2-loaded solution, and sustainability indicators. They are implemented for solvent selection (a) from novel, aqueous mixtures of N-methylcyclohexylamine (MCA) with piperazine (PZ), 2-amino-2-methyl-1-propanol (AMP), potassium hydroxide (KOH), and potassium chloride (KCl) and (b) from aqueous monoethanolamine (MEA), AMP, KOH, MCA, and PZ solutions. Versions of a modified Kent-Eisenberg model for strong bases, carbamate, and non-carbamate-forming amine solutions are developed and parameterized through experimental equilibrium measurements. CO2R experimental results are presented for solutions of KOH and MCA + KOH, as these indicate desired trade-offs for CO2 absorption and reduction.
Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE; USDOE Office of Fossil Energy and Carbon Management (FECM); USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
2550704
Alternate ID(s):
OSTI ID: 2583854
Report Number(s):
INL/JOU--24-78884
Journal Information:
AIChE Journal, Journal Name: AIChE Journal Journal Issue: 5 Vol. 71; ISSN 1547-5905; ISSN 0001-1541
Publisher:
American Institute of Chemical EngineersCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

Amines
CO2 capture
Captured CO2 conversion
Electrocatalytic CO2 reduction
Electrolysis
Solvents
Vapour-liquid equilibrium experiments
thermodynamic models