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In relation to this article, we declare that there is no conflict of interest.
Publication history
Received July 27, 2022
Revised September 19, 2022
Accepted October 12, 2022
Acknowledgements
This work was supported by Priority Research Centers Program funded by the Ministry of Education (2014R1A6A1031189), a grant (22PCHG-C161574-02) from Development of Demonstration-scale Hydrogen Production Technology using Petroleum coke Program funded by Ministry of Land, Infrastructure and Transport of Korea government, and 2021 Yeungnam University Research Grant. This work was also supported by the Basic Science Research Program (2020R1I1A3051997) through the National Research Foundation of Korea (NRF) fu
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Enhanced desulfurization performance of copper aerogel-based absorbents

1School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, Korea 2William G. Lowrie Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA 3Department of Future Energy Convergence, Seoul National University of Science & Technology, 232 Gongreung-ro, Nowon-gu, Seoul 01811, Korea 4Institute for Advanced Engineering, 175-28, Goan-ro 51 beon-gil, Baegam-myeon, Cheoin-gu, Yongin-si, Gyeonggi-do 17180, Korea 5Institute of Clean Technology, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, Korea
wkim@ynu.ac.kr, nokukpark@ynu.ac.kr, mk_kim@ynu.ac.kr
Korean Journal of Chemical Engineering, April 2023, 40(4), 791-801(11), 10.1007/s11814-022-1317-7
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Abstract

Copper aerogel was employed as a sulfur absorbent to enhance desulfurization performance. The copper aerogel was synthesized using an ethanolic approach and dried by three different drying techniques of freeze drying, organic solvent sublimation drying with tert-butanol, and acetonitrile. The typical interconnecting and porous structure of the aerogel was clearly observed only for the aerogel sample made by freeze-drying. Further desulfurization tests showed that freeze-dried copper aerogel had the highest sulfur capacity (12 mgS/g-sorbent) at a low temperature of 200 o C. This enhancement was driven by two factors. 1) The interconnecting structure of copper aerogel weakens the gas diffusion resistance, which can prevent the gas from flowing the inside of sample thereby reducing the efficiency of absorbent. 2) The partially oxidized structure of Cu2O is thermodynamically active toward the desulfurization reaction, which was confirmed by density functional theory calculations. Overall, using copper aerogels with an interconnecting structure and Cu2O composition would be a novel approach to enhance desulfurization performance.

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