(401e) Capture of Nitric Oxide in Simulated Flue Gas By a Metallic Functional Ionic Liquid

Ying Sun¹, Shuhang Ren¹, Yucui Hou², Kai Zhang¹, Weize Wu^1,*

¹State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

²Department of Chemistry, Taiyuan Normal University, Taiyuan 030031, China

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Nitric oxide (NO) is one of the main air pollutants threatening human health and environment. Currently, selective catalytic reduction (SCR) is the most widely used technology in industry. However, the catalyst poisoning, equipment corrosion and NH₃ escape make the SCR technology to be challenged. In last decade, ionic liquids (ILs) have been widely studied on efficient and reversible removal of CO₂ and SO₂ in fue gas due to their benign physicochemical properties, such as negligible vapor pressure, high stability and tunable structure. However, there is very little research on NO absorption by ILs. In this work, a metallic functional ionic liquid [Bmim]₂FeCl₄ was designed and applied to efficiently and reversibly capture NO in a simulated flue gas. The solubility of 2000 ppm NO in the IL was high up to 0.238 mol of NO / mol of IL at 30 ^oC, and the absorbed NO could be easily desorbed from the IL. NO solubility increased with decreasing temperature and increasing NO partial pressure. Meanwhile, the absorption capacity of IL did not change after 4 absorption/desorption cycles. Furthermore, the absorption mechanism was studied by FT-IR, and the result demonstrated that there was a chemical interaction between Fe²⁺ and NO.

The project is financially supported by the National Natural Science Foundation of China (No. 21176020 and 21306007)

Keywords: Absorption; Nitric oxide; Simulated flue gas; Functional ionic liquid