In situ FT-IR analysis of coke formation mechanism during Co-pyrolysis of low-rank coal and direct coal liquefaction residue

Yonghui Song, Siming Lei, Jincheng Li, Ning Yin, Jun Zhou and Xinzhe Lan

Renewable Energy, 2021, vol. 179, issue C, 2048-2062

Abstract: In situ Fourier transform infrared spectroscopy and thermogravimetric analysis were conducted to characterise the co-pyrolysis of low-rank coal (SJC) and direct coal liquefaction residue (DCLR) as well as the evolution of the main functional groups of the pyrolysis products. This research is expected to further elucidate the reaction mechanism of co-pyrolysis. It was found that the co-pyrolysis of SJC and DCLR has synergistic effects and increases the hydrogen supply during co-pyrolysis. The chain breakage and thermal decomposition of functional groups during co-pyrolysis lead to the formation of solid, liquid, and gaseous products. The presence of DCLR promotes deep pyrolysis to produce numerous aromatic and aliphatic groups; many of these free-radical fragments rearrange and condense with hydrogen free radicals ([H]) to produce tar with a high molecular weight. When the [H] content is low, the free-radical fragments combine with each other to form solid coke. During co-pyrolysis, SJC and DCLR serve as both, hydrogen transmitters and donors. The catalysed hydrocraking of aromatic hydrocarbons and phenols in the tar product in the presence of hydrogen increases the content of the light component in the tar and produces alkanes, decreasing the aromatics and phenol contents.

Keywords: Low-rank coal; Direct coal liquefaction residue; Co-pyrolysis; In situ FT-IR (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148121011903
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:179:y:2021:i:c:p:2048-2062

DOI: 10.1016/j.renene.2021.08.030

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().