Exploring the acid gas sorption properties of oxidatively degraded supported amine sorbents

Abstract

Amine-supported mesoporous oxide materials have proven to be effective acid gas sorbents. While the primary application of these supported amine species has been CO2 capture, they have also shown to be proficient at adsorbing other
damaging flue gas impurities such as SOx and NOx. The precise nature of the amine (primary, secondary, or tertiary) is known to dictate the gas−amine interactions, with tertiary amines of particular interest due to their inability to adsorb dry CO2, favoring SOx and NOx species. The different amine sites also provoke differences in oxidative stability, when exposed to temperatures similar to those used for thermal desorption procedures. Herein we focus on the structural and chemical changes that occur in a range of class 1 (amine-impregnated) and class 2 (amine-grafted) sorbents upon oxidation and correlate these with their variation in acid gas (CO2, NO2, and SO2) uptakes, as a function of the oxidation temperature. These studies suggest that oxidatively degraded or “spent” supported amine materials may have possible uses as NOx or SOx sorbents. Specifically, despite oxidative degradation these aminopolymer species maintain a reasonable level of NO2 uptake, despite losing the ability to capture SO2 or CO2, offering unique possibilities in selective NO2 capture.

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ORCID for Matthew Potter: orcid.org/0000-0001-9849-3306

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