1. Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2. Department of Chemistry, Brown University, 324 Brook St Box H, Providence, Rhode Island 02912, United States
3. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
4. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China