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A superbase ionic liquid (IL), trihexyltetradecylphosphonium benzimidazolide ([P 66614 ][Benzim]), is investigated for the capture of CO 2 in the presence of NO 2 impurities. The effect of the waste gas stream contaminant on the ability of the IL to absorb simultaneously CO 2 is demonstrated using novel measurement techniques, including a mass spectrometry breakthrough method and in situ infrared spectroscopy. The findings show that the presence of an industrially relevant concentration of NO 2 in a combined feed with CO 2 has the effect of reducing the capacity of the IL to absorb CO 2 efficiently by ∼60% after 10 absorption-desorption cycles. This finding is supported by physical property analysis (viscosity, 1 H and 13 C NMR, and X-ray photoelectron spectroscopy) and spectroscopic infrared characterization, in addition to density functional theory (DFT) calculations, to determine the structure of the IL-NO 2 complex. The results are presented in comparison with another flue gas component, NO, demonstrating that the absorption of NO 2 is more favorable, thereby hindering the ability of the IL to absorb CO 2 . Significantly, this work aids understanding of the effects that individual components of flue gas have on CO 2 capture sorbents, through studying a contaminant that has received limited interest previously.

Combined Experimental and Theoretical Study of the Competitive Absorption of CO2 and NO2 by a Superbase Ionic Liquid

Combined Experimental and Theoretical Study of the Competitive Absorption of CO₂ and NO₂ by a Superbase Ionic Liquid