Assessment of lignite upgrade and hydrogen evolution via electrolysis

Lyu Xiang; Hu Junyi

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Assessment of lignite upgrade and hydrogen evolution via electrolysis

机译：Assessment of lignite upgrade and hydrogen evolution via electrolysis

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Lignite, considered as the lowest-rank coal, accounts for 45% of the total coal resources worldwide, and its low carbon and high ash contents limit its large-scale application. In order to upgrade lignite effectively, a modified coal electrolytic cell (MCEC) was designed, built, and then evaluated for lignite upgrade and hydrogen pro-duction through electrolysis, and the operating conditions were optimized. The results show that the perfor-mance of the MCEC outperformed the previous coal electrolytic cell (CEC). The operating temperature and iron concentration significantly impact the average current density per milligram of catalyst (ACDMC). The content of dry fixed carbon and heating value increased by 20.9% (wt%) and 8.15%, respectively, in electrolyzed lignite compared with raw lignite. Besides, 71.5% ash and 39.6% mercury were removed from raw lignite after elec-trolysis, which is the first report. The Faradaic efficiency (FE) for hydrogen evolution reached 99% using MCEC. In addition, the analysis of spectroscopy methods (SEM, EDX, FTIR, and XRD) revealed that the lignite particles were cracked; the oxygen-containing functional groups increased; the minerals of quartz and hematite formed on the surface of lignite particles after electrolysis. The facts indicate that electrolysis of lignite is a competitive approach for lignite upgrade and hydrogen production.

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来源
《Energy conversion & management》 |2022年第2期|115181.1-115181.9|共9页
作者
Lyu Xiang; Hu Junyi;
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作者单位

Ohio Univ, Chem & Biomol Engn Dept, 165 Stocker Ctr, Athens, OH 45701 USA|Oak Ridge Natl Lab, Electrificat & Energy Infrastruct Div, Oak Ridge, TN 37831 USA;

Ohio Univ, Chem & Biomol Engn Dept, 165 Stocker Ctr, Athens, OH 45701 USA|Univ Sci & Technol Liaoning, Sch Chem Engn, Anshan 114051, Liaoning, Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Lignite upgrade; Hydrogen evolution; Ash and mercury removal; Electrolysis;

Assessment of lignite upgrade and hydrogen evolution via electrolysis

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