1. Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
3. School of Chemical Engineering and Technology, Taiyuan University of Science and Technology, Taiyuan 030021, China
4. Department of Electrical and Computer Engineering, Texas A&M University, 188 Bizzell St., College Station, Texas 77843-3128, USA
5. School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, China
6. Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China