Supercritical drying: a promising technique on synthesis of sorbent for CO2 capture Online publication date: Mon, 12-Jun-2017
by Yong Kong; Xiaodong Shen; Sheng Cui; Maohong Fan
International Journal of Global Warming (IJGW), Vol. 12, No. 2, 2017
Abstract: The objective of this paper is to present a new technique, supercritical drying (SCD), for CO2 capture, utilisation and storage (CCUS). To investigate the effect of drying methods on the structure and CO2 capture performance of an aerogel sorbent, amine hybrid silica aerogel (AHSA) was prepared by SCD and ambient pressure drying (APD). The characterisation results of N2 adsorption/desorption, scanning electron microscopy and X-ray photoelectron spectroscopy measurements demonstrate that the pore structure and surface amine content of the sorbent are significantly improved because of the use of SCD. The CO2 adsorption capacities of AHSA dried by SCD are much higher than that of AHSA dried by APD. The CO2 adsorption kinetics of the adsorbent under different conditions was also investigated. The results reveal that the sorbent preparation method is inspiring and its resulting sorbent is dynamic in low-concentration CO2 capture.
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