Designing Adsorbents for CO2 Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO2 Reversibly

J. Am. Chem. Soc., 130 (10), 2902 -2903, 2008. 10.1021/ja077795v S0002-7863(07)07795-5
Web Release Date: February 19, 2008

Designing Adsorbents for CO₂ Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO₂ Reversibly

Jason C. Hicks, Jeffrey H. Drese, Daniel J. Fauth, McMahan L. Gray, Genggeng Qi, and Christopher W. Jones*

School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332, and U.S. Department of Energy, National Energy Technology Laboratory, 626 Cochrans Mill Road, Pittsburgh, Pennsylvania 15236

cjones@chbe.gatech.edu

Received October 10, 2007

Abstract:

Carbon dioxide adsorption from a simulated flue gas stream was successfully performed with a hyperbranched aminosilica (HAS) material. The HAS was synthesized by a one-step reaction, spontaneous aziridine ring-opening polymerization off of surface silanols, to form a 32 wt % organic/inorganic hybrid material. The adsorption measurements were performed in a fixed-bed flow reactor using humidified CO₂. The advantage of this adsorbent over previously reported adsorbents is the stability of the organic groups covalently bound to the silica support compared to those made by physisorbed methods. Furthermore, a large CO₂ capacity (~3 mmol CO₂/g adsorbent) associated with the high loading of amines was observed.

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