1. State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, PR China
2. Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, Shanxi 030024, PR China
3. College of Engineering and Physical Sciences, School of Energy Resources, University of Wyoming, Laramie, Wyoming 82071, United States
4. College of Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States