1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry & Chemical Engineering, Ningxia University, Yinchuan750021, China
2. Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok10330, Thailand
3. Ningxia Academy of Metrology and Quality Inspection, National Quality Supervision and Inspection Center for Coal and Coal Chemical Products (Ningxia), Yinchuan750200, China
4. Coal Chemical Industry Technology Research Institute, China Energy Group Ningxia Industry Coal Co. Ltd., Yinchuan750411, Ningxia, China