首页|Insight into the microstructural evolution of anthracite during carbonization-graphitization process from the perspective of materialization
Insight into the microstructural evolution of anthracite during carbonization-graphitization process from the perspective of materialization
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Materialization of coal is one of effective and clean pathways for its utilization.The microstructures of coal-based carbon materials have an important influence on their functional applications.Herein,the microstructural evolution of anthracite in the temperature range of 1000-2800℃was systematically investigated to provide a guidance for the microstructural regulation of coal-based carbon materials.The results indicate that the microstructure of anthracite undergoes an important change during carbonization-graphitization process.As the temperature increases,aromatic layers in anthracite gradu-ally transform into disordered graphite microcrystals and further grow into ordered graphite microcrys-tals,and then ordered graphite microcrystals are laterally linked to form pseudo-graphite phase and eventually transformed into highly ordered graphite-like sheets.In particular,2000-2200℃is a critical temperature region for the qualitative change of ordered graphite crystallites to pseudo-graphite phase,in which the relevant structural parameters including stacking height,crystallite lateral size and graphi-tization degree show a rapid increase.Moreover,both aromaticity and graphitization degree have a linear positive correlation with carbonization-graphitization temperature in a specific temperature range.Besides,after initial carbonization,some defect structures in anthracite such as aliphatic carbon and oxygen-containing functional groups are released in the form of gaseous low-molecular volatiles along with an increased pore structure,and the intermediates derived from minerals could facilitate the con-version of sp3 amorphous carbon to sp2 graphitic carbon.This work provides a valuable reference for the rational design of microstructure of coal-based carbon materials.
Henan Key Laboratory of Coal Green Conversion.College of Chemistry and Chemical Engineering,Henan Polytechnic University,Jiaozuo 454003,China
State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization,Jiaozuo 454003,China
Henan Province Industrial Technology Research Institute of Resources and Materials,Zhengzhou University,Zhengzhou 450001,China
National Engineering Research Center of Coal Preparation and Purification,China University of Mining and Technology,Xuzhou 221116,China
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国家自然科学基金国家自然科学基金国家自然科学基金Key Scientific and Technological Project of Henan ProvinceCoal Green Conversion Outstanding Foreign Scientists Foundation of Henan Province
NETL
NSTL
万方数据
维普
