Abstract
As a low-rank coal, lignite (brown coal) is usually well treated by chemical or enzymatic methods prior to its utilization for energy and materials. Following ionic liquids (ILs)-pretreatment, this study focuses on the treatment of lignite by oxidoreductase-type of enzymes including horseradish peroxidase (HRP), alcohol dehydrogenase (ADH), and laccase. We observed some synergistic effects of IL-pretreatment and enzymatic actions on lignite coal. The combination of IL-pretreatment and HRP-/ADH-treatment enabled smaller and more uniform coal particles than IL-pretreatment alone or that without HRP. However, laccase-treatment led to large coal aggregates likely due to the crosslinking effect. Both HRP- and ADH-treatments induced a lower aliphatic and a higher aromatic content of lignite, particularly when the coal was pretreated by an IL prior to the enzymatic process. Both ADH- and laccase-treatments produced more hydrogen bonds in the coal. Therefore, the combined treatments of lignite by ILs and oxidoreductases dedicate low-rank coal structures.
Original language | English (US) |
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Pages (from-to) | 1909-1915 |
Number of pages | 7 |
Journal | Chemical Engineering Communications |
Volume | 210 |
Issue number | 11 |
DOIs | |
State | Published - 2023 |
Bibliographical note
Funding Information:Acknowledgment is made to the Donors of the American Chemical Society Petroleum Research Fund (PRF# 60077-ND4) for support of this research.
Publisher Copyright:
© 2022 Taylor & Francis Group, LLC.
Keywords
- Coal
- enzyme
- ionic liquid
- lignite
- liquefaction
- oxidoreductase
- treatment