Title: Supercritical drying: a promising technique on synthesis of sorbent for CO₂ capture

Authors: Yong Kong; Xiaodong Shen; Sheng Cui; Maohong Fan

Addresses: College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China; Department of Chemical and Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA; State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China ' College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China; State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China ' College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China; State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China ' Department of Chemical and Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA; School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

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.

Keywords: CO₂ capture; supercritical drying; aerogel; sorbent; adsorption.

DOI: 10.1504/IJGW.2017.084507

International Journal of Global Warming, 2017 Vol.12 No.2, pp.228 - 241

Received: 11 Oct 2014
Accepted: 03 Jun 2015
Published online: 12 Jun 2017 *

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