Journal Article

Preparation and characterization of coal-based graphite from Huyan mountain anthracite by high-temperature simulation

Chen, Gaojian, Cao, Daiyong, He, Hongsheng, Wang, Anmin, Liao, Fengchu, Peng, Simai

2025

Overview

This study systematically investigates the graphitization behavior of high-metamorphic anthracite from Huyan Mountain (Shanxi, China) under extreme thermal conditions (2100–3000 °C) through integrated experimental and microstructural analyses. Acid-washed and demineralized coal samples, with or without Fe₂O₃ catalyst, were subjected to controlled thermal treatment to evaluate structural evolution and catalytic effects. X-ray diffraction (XRD) analysis identifies a critical graphitization threshold at d 002 = 0.3368 nm, beyond which interlayer spacing ceases reduction despite continued lattice refinement. Below 2700 °C, Fe₂O₃ catalysis significantly accelerates aromatic layer stacking and in-plane defect healing, advancing graphitization process. Post-threshold stabilization (≥2700 °C), both catalytic and non-catalytic systems exhibit analogous d 002 stagnation, yet high-resolution transmission electron microscopy (HRTEM) reveals persistent structural ordering, including increased carbon layer stacking (up to 10 layers) and reduced edge defects. Comparative scanning electron microscopy (SEM) demonstrates enhanced flake alignment and interlayer compactness in catalyzed samples. These findings highlight intrinsic limitations in coal-derived graphite synthesis, emphasizing precursor composition as a decisive factor in graphitization potential. The work provides critical insights into graphitization mechanisms and constraints for artificial coal-based graphite production.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Anthracite / Anthracite coal / By-products / Carbon / Catalysis / China / Coal / Coal - analysis / Defects / Demineralizing / Electron microscopy / Experiments / Ferric Compounds - chemistry / Flakes (defects) / Graphite / Graphite - chemistry / Graphitization / Heat treatment / High resolution electron microscopy / High temperature / Hot Temperature / Interlayers / Lasers / Microscopy, Electron, Scanning / Minerals / Mountains / Production processes / Scanning electron microscopy / Simulation / Spectrum analysis / Temperature / Thermal properties / Transmission electron microscopy / X-Ray Diffraction