1. Key Laboratory of Coal Processing and Efficient Utilization, Ministry of EducationChina University of Mining & Technology Xuzhou 221116 Jiangsu China
2. Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, Xinjiang Uygur Autonomous RegionCollege of Chemistry and Chemical Engineering, Xinjiang University Urumqi 830046 Xinjiang China
3. State Key Laboratory of Coal Combustion, School of Energy and Power EngineeringHuazhong University of Science and Technology Wuhan 430074 Hubei China