1. College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, P. R. China
2. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, P. R. China
3. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, P. R. China
4. College of Engineering & Physical Sciences, School of Energy Resources, University of Wyoming, Laramie, Wyoming 82071, United States
5. College of Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States