Insights into the Oxidative Degradation Mechanism of Solid Amine Sorbents for CO 2 Capture from Air: Roles of Atmospheric Water

Carneiro, Juliana S. A.; Innocenti, Giada; Moon, Hyun June; Guta, Yoseph; Proaño, Laura; Sievers, Carsten; Sakwa‐Novak, Miles A.; Ping, Eric W.; Jones, Christopher W.

doi:10.1002/ange.202302887

Title: Insights into the Oxidative Degradation Mechanism of Solid Amine Sorbents for CO ₂ Capture from Air: Roles of Atmospheric Water

Journal Article · 04 May 2023 · Angewandte Chemie

DOI: https://doi.org/10.1002/ange.202302887 · OSTI ID:1983374

Carneiro, Juliana S. A. ^[1]; Innocenti, Giada ^[1]; Moon, Hyun June ^[1]; Guta, Yoseph ^[1]; Proaño, Laura ^[1]; Sievers, Carsten ^[1]; Sakwa‐Novak, Miles A. ^[2]; Ping, Eric W. ^[2];

^[1]

School of Chemical &, Biomolecular Engineering Georgia Institute of Technology Atlanta GA 30332 USA
Global Thermostat LLC 10275 E106th Ave Brighton CO 80601 USA

Abstract Direct air capture (DAC) processes for extraction of CO ₂ from ambient air are unique among chemical processes in that they operate outdoors with minimal feed pretreatments. Here, the impact of humidity on the oxidative degradation of a prototypical solid supported amine sorbent, poly(ethylenimine) (PEI) supported on Al ₂ O ₃ , is explored in detail. By combining CO ₂ adsorption measurements, oxidative degradation rates, elemental analyses, solid‐state NMR and in situ IR spectroscopic analysis in conjunction with ¹⁸ O labeling of water, a comprehensive picture of sorbent oxidation is achieved under accelerated conditions. We demonstrated that the presence of water vapor can play an important role in accelerating the degradation reactions. From the study we inferred the identity and kinetics of formation of the major oxidative products, and the role(s) of humidity. Our data are consistent with a radical mediated autooxidative degradation mechanism.

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Sponsoring Organization:: USDOE

OSTI ID:: 1983374

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 135 Journal Issue: 24; ISSN 0044-8249

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

Country of Publication:: Germany

Language:: English

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Title: Insights into the Oxidative Degradation Mechanism of Solid Amine Sorbents for CO ₂ Capture from Air: Roles of Atmospheric Water