Carbon Dioxide Capture by an Amine Functionalized Ionic Liquid: Fundamental Differences of Surface and Bulk Behavior

Niedermaier I, Bahlmann M, Papp C, Kolbeck C, Wei W, Krick Calderon S, Grabau M, Schulz P, Wasserscheid P, Steinrück HP, Maier F (2014)


Publication Status: Published

Publication Type: Journal article

Publication year: 2014

Journal

Publisher: American Chemical Society

Book Volume: 136

Pages Range: 436-441

DOI: 10.1021/ja410745a

Abstract

Carbon dioxide (CO2) absorption by the amine-functionalized ionic liquid (IL) dihydroxyethyl dimethylammonium taurinate at 310 K was studied using surface- and bulk-sensitive experimental techniques. From near-ambient pressure X-ray photoelectron spectroscopy at 0.9 mbar CO2, the amount of captured CO2 per mole of IL in the near-surface region is quantified to similar to 0.58 mol, with similar to 0.15 mol in form of carbamate dianions and similar to 0.43 mol in form of carbamic acid. From isothermal uptake experiments combined with infrared spectroscopy, CO2 is found to be bound in the bulk as carbamate (with nominally 0.5 mol of CO2 bound per 1 mol of IL) up to similar to 2.5 bar CO2, and as carbamic acid (with nominally 1 mol CO2 bound per 1 mol IL) at higher pressures. We attribute the fact that at low pressures carbamic acid is the dominating species in the near-surface region, while only carbamate is formed in the bulk, to differences in solvation in the outermost IL layers as compared to the bulk situation.

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APA:

Niedermaier, I., Bahlmann, M., Papp, C., Kolbeck, C., Wei, W., Krick Calderon, S.,... Maier, F. (2014). Carbon Dioxide Capture by an Amine Functionalized Ionic Liquid: Fundamental Differences of Surface and Bulk Behavior. Journal of the American Chemical Society, 136, 436-441. https://dx.doi.org/10.1021/ja410745a

MLA:

Niedermaier, Inga, et al. "Carbon Dioxide Capture by an Amine Functionalized Ionic Liquid: Fundamental Differences of Surface and Bulk Behavior." Journal of the American Chemical Society 136 (2014): 436-441.

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