Sterically hindered amine-functionalized MCM-41 composite for efficient carbon dioxide capture

A new adsorbent based on sterically hindered amine for efficient CO 2 capture was prepared. Mesoporous silicon MCM-41 was modified by sterically hindered amine AMPD (2-amino-2-methyl-1,3-propanediol) in different AMPD loadings by a facile solid-state self-assembly approach. The physicochemical properties of the MCM-41@AMPD composites were analyzed using XRD, BET, FT-IR and SEM, and the composites were investigated for the CO 2 capture performance, including CO 2 capture capacity, adsorption selectivity and cycling stability. Characterization analyses showed that the AMPD active components were successfully incorporated and well dispersed into the mesoporous silicon MCM-41 surfaces. Adsorption results suggest that the modification by the active ingredient AMPD can significantly improve the CO 2 capture performance. The MCM-41@AMPD material with an AMPD loading of 7 mmol·g − 1 MCM-41 support exhibits a good CO 2 adsorption capacity and CO 2 adsorption selectivity, and shows excellent cycling stability. Furthermore, the isosteric heat of CO 2 adsorption on the MCM-41@AMPD-7 material was evaluated by the Clausius-Clapeyron equation, and the value was 34–78 kJ·mol − 1 .