Gas Generation Characteristics and Mechanisms of Medium-Rank Bituminous Coal Under Rotational Shear
- 1School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, China
- 2Henan Key Laboratory of Coal Measure Unconventional Resources Accumulation and Exploitation, Jiaozuo 454003, China
- 3College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract
Clarifying whether tectonic stress directly induces coal macromolecular structural evolution and gas generation plays a key role in elucidating deep coal gas sources and coal-gas outburst mechanisms. Existing studies pay insufficient attention to medium-rank bituminous coal, which is abundant in aliphatic side chains and active functional groups, and its stress-responsive gas generation mechanism remains unclear. Rotational shear experiments were conducted on coal from Pingdingshan No.10 Mine under 12.5 MPa axial pressure at 25 °C and 80 °C with three shear rates. Notably, no replicate samples were set for each experimental condition. Gas generation characteristics and structural evolution were characterized via FTIR, 13C NMR and GC–MS analyses. Results show that 25 °C shearing only causes physical fragmentation, with CO2 as the sole product. Under 80 °C thermo-mechanical coupling, low shear rate preferentially cleaves aliphatic side chains, yielding the highest CH4 and promoting aromatic polycondensation. High shear rate fragments aromatic skeletons, suppressing hydrocarbon generation and dominating CO2 production. This study verifies the stress–temperature coupling chemical effect of medium-rank bituminous coal and reveals the shear-rate-regulated differential gas generation mechanism, providing direct experimental evidence for tectonic stress-induced coalification and gas generation.
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BibTeX
@article{cheng2026generation,
title = {{Gas Generation Characteristics and Mechanisms of Medium-Rank Bituminous Coal Under Rotational Shear}},
author = {Nannan Cheng and Xian Wang and Wenhui Yan and Mengyan Shi and Jienan Pan and Quanlin Hou},
journal = {Nanomaterials},
year = {2026},
month = oct,
doi = {10.3390/nano16201287},
url = {https://www.mdpi.com/2079-4991/16/20/1287},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Gas Generation Characteristics and Mechanisms of Medium-Rank Bituminous Coal Under Rotational Shear
AU - Nannan Cheng
AU - Xian Wang
AU - Wenhui Yan
AU - Mengyan Shi
AU - Jienan Pan
AU - Quanlin Hou
PY - 2026
DA - 2026/10/01
JO - Nanomaterials
DO - 10.3390/nano16201287
UR - https://www.mdpi.com/2079-4991/16/20/1287
AB - Clarifying whether tectonic stress directly induces coal macromolecular structural evolution and gas generation plays a key role in elucidating deep coal gas sources and coal-gas outburst mechanisms. Existing studies pay insufficient attention to medium-rank bituminous coal, which is abundant in aliphatic side chains and active functional groups, and its stress-responsive gas generation mechanism remains unclear. Rotational shear experiments were conducted on coal from Pingdingshan No.10 Mine under 12.5 MPa axial pressure at 25 °C and 80 °C with three shear rates. Notably, no replicate samples were set for each experimental condition. Gas generation characteristics and structural evolution were characterized via FTIR, 13C NMR and GC–MS analyses. Results show that 25 °C shearing only causes physical fragmentation, with CO2 as the sole product. Under 80 °C thermo-mechanical coupling, low shear rate preferentially cleaves aliphatic side chains, yielding the highest CH4 and promoting aromatic polycondensation. High shear rate fragments aromatic skeletons, suppressing hydrocarbon generation and dominating CO2 production. This study verifies the stress–temperature coupling chemical effect of medium-rank bituminous coal and reveals the shear-rate-regulated differential gas generation mechanism, providing direct experimental evidence for tectonic stress-induced coalification and gas generation.
SN - 2079-4991
ER -