Reducing of Nitrous Oxide Emissions Using Ionic Liquids

Abstract

This work is focused on the possible capture of nitrous oxide and more precisely protoxide using ionic liquids (ILs). ILs are gaining special attention since the efficiency of many processes can be enhanced by the judicious manipulation of their properties. The absorption of greenhouse gases can be enhanced by the basic character of the IL. In this work, these characteristics are evaluated through the study of the gas-liquid equilibrium of five imidazolium-based ILs: 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF(4)]), 1-butyl-3-methylimidazolium thiocyanate ([BMIM][SCN]), 1,3-dimethylimidazolium methylphosphonate ([DMIM][MP]), 1,3-diethoxyimidazolium bis(trifluoromethylsulfonyl)imide ([(ETO)(2)IM][Tf(2)N]), and 1,3-dihydroxyimidazolium bis(trifluoromethylsulfonyl)imide ([(OH)(2)IM][Tf(2)N]) with N(2)O at temperatures up to 373 K and pressures up to 300 bar. Experimental data indicate that 44-105 g of N(2)O can be absorbed per kilograms of IL.

Surface Enrichment in Equimolar Mixtures of Non‐Functionalized and Functionalized Imidazolium‐Based Ionic Liquids

“…The tethering of methoxy groups at the imidazolium ring in [(MeO) 2 Im][PF 6 ] is expected to have a strong influence on the electronic structure of the imidazolium ring compared to 1,3‐dialkylimidazolium systems,38 which can be accessed by XPS as has been previously shown for a thiouronium‐functionalized IL 39. Dialkoxyimidazolium compounds are interesting due to their ability to dissolve a reasonable amount of the greenhouse gases CO 2 40 and N 2 O 41. They are also suitable in synthesis due to the fact that N‐heterocyclic carbenes (NHCs) are easily made from imidazolium‐based ILs which then can serve as catalyst or solvent in reactions.…”

“…[39] Dialkoxyimidazolium compounds are interesting due to their ability to dissolve a reasonable amount of the greenhouse gases CO 2 [40] and N 2 O. [41] They are also suitable in synthesis due to the fact that N-heterocyclic carbenes (NHCs) are easily made from imidazolium-based ILs which then can serve as catalyst or solvent in reactions. It was shown that similar compounds as the [(MeO) 2 Im][PF 6 ], e. g. with a bromo-substituent attached to the C 2 -position or with more bulky substituents, form several metal-NHC-complexes.…”

Novel Guanidinium-Based Ionic Liquids for Highly Efficient SO2 Capture

“…17,18 This kind of process has been developed on the basis of the appealing properties of various ILs, such as the mostly studied imidazolium-based ILs. The achievements made by researchers have proved that ILs are promising materials in the application of hazardous gas absorption.…”

Thermodynamic validation of 1‐alkyl‐3‐methylimidazolium carboxylates as task‐specific ionic liquids for H2S absorption

“…Most importantly, ILs can be functionalized to be task‐specific ILs (TSILs), which enables highly efficient and selective separation or reaction process according to our requirements. As a consequence, ILs have been regarded as a new type of “green solvents” that exhibit extensive potential of application in many fields such as catalysis, electrolysis, extraction, membrane separation, and gas absorption.…”