Direct Air Capture of CO2 with Aqueous Amino Acids and Solid Bis-iminoguanidines (BIGs)

Custelcean, Radu; Williams, Neil J.; Garrabrant, Kathleen A.; Agullo, Pierrick; Brethome, Flavien M.; Martin, Halie; Kidder, Michelle

doi:10.1021/acs.iecr.9b04800

Direct Air Capture of CO₂ with Aqueous Amino Acids and Solid Bis-iminoguanidines (BIGs)

Journal Article · Tue Nov 19 23:00:00 EST 2019 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/acs.iecr.9b04800· OSTI ID:1606973

^[1]; ^[1]; Garrabrant, Kathleen A. ^[1]; ^[1]; Brethome, Flavien M. ^[1]; Martin, Halie ^[1]; ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We report a bench-scale direct air capture (DAC) process comprising CO₂ absorption with aqueous amino acid salts (i.e., potassium glycinate, potassium sarcosinate), followed by room-temperature regeneration of the amino acids by reaction with solid meta-benzene-bis(iminoguanidine) (m-BBIG), resulting in crystallization of the hydrated m-BBIG carbonate salt, (m-BBIGH₂)(CO₃)(H₂O)_n (n = 3–4). The CO₂ is subsequently released by mild heating (60–120 °C) of the carbonate crystals, which regenerates the m-BBIG solid quantitatively. This low-temperature crystallization-based DAC process circumvents the need to heat the aqueous amino acid sorbents, thereby minimizing their loss through thermal and oxidative degradation. The CO₂ cyclic capacity for the sarcosine/m-BBIG system, measured over three consecutive absorption/regeneration cycles, is in the range of 0.12–0.20 mol/mol. The regeneration energy of m-BBIG, comprising the enthalpy of CO₂ and water release, and the sensible heat, is 360 kJ/mol (8.2 GJ/ton CO₂). Alternatively, the aqueous amino acids can be regenerated by boiling under reflux, with measured cyclic capacities of up to 0.64 mol/mol.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1606973

Journal Information:: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 51 Vol. 58; ISSN 0888-5885

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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