Pathways of the Chemical Reaction of Carbon Dioxide with Ionic Liquids and Amines in Ionic Liquid Solution
| Autor: | Lisa Saunders Baugh, Pavel Kortunov, Michael Siskin |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Energy & Fuels. 29:5990-6007 |
| ISSN: | 1520-5029 0887-0624 |
| Popis: | This paper focuses specifically on certain ionic liquids that are capable of acting as chemisorbents for CO2 at ambient pressure and temperature. This low-pressure approach based on chemical reactivity is more effective than traditional physical absorption/solubility approaches for CO2 capture in ionic liquids for higher pressure carbon capture. We describe a class of imidazolium ionic liquids bearing a relatively acidic hydrogen atom at C-2, which upon initial abstraction develops a nucleophilic carbon atom that is carboxylated by CO2. Basicity of the anion plays a role in the ability to remove the acidic hydrogen to generate the nucleophilic carbon. The yield of carboxylated ionic liquid is not affected by non-aqueous co-solvents but changes as a function of the CO2 partial pressure, solution temperature, and presence of H2O in solution. CO2 chemisorption by ionic liquids is particularly efficient in the presence of a non-nucleophilic nitrogenous base that serves to promote ionic liquid carboxylation an... |
| Databáze: | OpenAIRE |
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