NaNO 3 ‐Promoted Mesoporous MgO for High‐Capacity CO 2 Capture from Simulated Flue Gas with Isothermal Regeneration

Park, Sang Jae; Kim, Youngjo; Jones, Christopher W.

doi:10.1002/cssc.202000259

NaNO ₃ ‐Promoted Mesoporous MgO for High‐Capacity CO ₂ Capture from Simulated Flue Gas with Isothermal Regeneration

Journal Article · Tue Apr 21 00:00:00 EDT 2020 · ChemSusChem

DOI:https://doi.org/10.1002/cssc.202000259· OSTI ID:1615538

Park, Sang Jae ^[1]; Kim, Youngjo ^[1]; ^[1]

School of Chemical &, Biomolecular Engineering Georgia Institute of Technology 311 Ferst Dr. Atlanta GA 30332-0100 USA

Abstract

NaNO ₃ ‐promoted MgO composite materials have been prepared and their ability to sorb CO ₂ at a concentration relevant to CO ₂ capture from flue gas is explored. The uptake kinetics and capacities of sorbents of different NaNO ₃ /MgO ratios are measured at intermediate temperatures of 230–300 °C. The sorbent with a NaNO ₃ /MgO ratio of 0.10 has the highest 12 h sorption capacity among sorbents with different NaNO ₃ loadings, and the highest sorption capacity of 11.2 mmol g ⁻¹ is observed at 260 °C. Intriguingly, an induction period is observed in the initial stage of CO ₂ sorption. In situ XRD analysis, in situ FTIR spectroscopy, and a comparison of the CO ₂ sorption behavior under simulated flue gas conditions in comparison to prior studies employing pure CO ₂ indicated that the sorption of CO ₂ occurred through nucleation of MgCO ₃ crystallites in the material. The data indicate that the concentration of CO ₂ within the molten medium of NaNO ₃ , which is affected by both the solubility of CO ₂ in molten NaNO ₃ and the partial pressure of CO ₂ in the surrounding atmosphere, has a critical impact on the length of the induction period. A partially desorbed sample after sorption of CO ₂ displays much‐improved sorption kinetics in the next cycle and was able to sorb and desorb CO ₂ over multiple cycles at isothermal conditions by simply switching the feed gas from CO ₂ to inert gas.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0012577

OSTI ID:: 1615538

Alternate ID(s):: OSTI ID: 1802406

Journal Information:: ChemSusChem, Journal Name: ChemSusChem Journal Issue: 11 Vol. 13; ISSN 1864-5631

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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NaNO ₃ ‐Promoted Mesoporous MgO for High‐Capacity CO ₂ Capture from Simulated Flue Gas with Isothermal Regeneration