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Issue 11, 2011
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Amidoximes: promising candidates for CO2 capture

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Monoethanolamine (MEA) dominates power plant carbon dioxide (CO2) scrubbing processes, though with major disadvantages such as a 8–35% energy penalty. Here we report that structurally comparable amidoximes are promising CO2 capture agents based on RIMP2 electronic structure calculations. This was experimentally verified by the synthesis and testing of representative amidoximes for capture efficiencies at pressures as high as 180 bar. Acetamidoxime, which has the highest percent amidoxime functionality showed the highest CO2 capacity (2.71 mmol g−1) when compared to terephthalamidoxime (two amidoximes per molecule) and tetraquinoamidoxime (four amidoximes per molecule). Polyamidoxime surpassed activated charcoal Norit RB3 for CO2 capture per unit surface area. Adsorption isotherms exhibit Type IV behavior and acetamidoxime found to increase CO2 capture with temperature, a less observed anomaly. Porous amidoximes are proposed as valuable alternatives to MEA.

Graphical abstract: Amidoximes: promising candidates for CO2 capture

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Supplementary files

Article information

02 Aug 2011
30 Aug 2011
First published
19 Sep 2011

Energy Environ. Sci., 2011,4, 4528-4531
Article type

Amidoximes: promising candidates for CO2 capture

S. Zulfiqar, F. Karadas, J. Park, E. Deniz, G. D. Stucky, Y. Jung, M. Atilhan and C. T. Yavuz, Energy Environ. Sci., 2011, 4, 4528
DOI: 10.1039/C1EE02264D

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