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Received February 21, 2017
Accepted October 18, 2017
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Coal structure change by ionic liquid pretreatment for enhancement of fixed-bed gasification with steam and CO2
Department of Energy Systems Research, Ajou University, Woncheon-dong, Youngtong-gu, Suwon 16499, Korea 1Department of Chemical Engineering, McMaster University, Hamilton, Ontario, L8S 4L8, Canada 2Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai, 200237, P. R. China
htkim@ajou.ac.kr
Korean Journal of Chemical Engineering, February 2018, 35(2), 445-455(11), 10.1007/s11814-017-0296-6
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Abstract
An innovative pretreatment of Indonesian low-rank coal (ILRC) by 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) ionic liquid (IL) was conducted. The obtained IL pretreated coal had a loose and porous structure. Fourier transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET) analysis showed that pretreated ILRC had a stronger absorption ability and an increased average pore size (from 23.6 to 51.8 nm). Steam-coal gasification was conducted to explore the effect of coal pretreatment. The result showed that 1.63-times more hydrogen was generated from pretreated coal compared to original (i.e., untreated) coal, and carbon conversion (Xc) increased from 89.03 to 97.25%. During CO2 coal gasification, IL pretreated coal had a greater CO2 consumption potential and generated more CO. The chemical exergy of syngas of the pretreated coal gasification was higher than that of the untreated coal gasification with CO2 at 900 °C. In addition, pretreated coal emitted less CO2 than untreated coal at 900 °C.
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