Li et al. (2024): Competing Kinetic Consequences of CO2 on the Oxidative Degradation of Branched Poly(ethylenimine)

Sichi Li, Yoseph Guta, Marcos F. Calegari Andrade, Elwin Hunter-Sellars, Amitesh Maiti, Anthony J. Varni, Paco Tang, Carsten Sievers, Simon H. Pang, Christopher W. Jones IN: Journal of the American Chemical Society, 2024, https://doi.org/10.1021/jacs.4c08126

Amine-functionalized porous solid materials are effective sorbents for direct air capture (DAC) of CO₂. However, they are prone to oxidative degradation in service, increasing the materials cost for widespread implementation. While the identification of oxidation products has given insights into degradation pathways, the roles of some species, like CO₂ itself, remain unresolved, with conflicting information in the literature. Here, the authors investigate the impact of CO₂ on the oxidative degradation of poly(ethylenimine)–alumina (PEI/Al₂O₃) sorbents under conditions encompassing a wide range of CO₂-air mixture compositions and temperatures relevant to DAC conditions, thereby reconciling the conflicting data in the literature.

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