1. School of Chemical Engineering; Anhui University of Science and Technology; 232001 Huainan P. R. China
2. School of Chemistry and Chemical Engineering; Yancheng Institute of Technology; 224051 Yancheng P. R. China
3. College of Chemistry and Chemical Engineering; Nanjing Tech University; 210009 Nanjing P. R. China
4. State Key Laboratory of Coal Conversion; Institute of Coal Chemistry, Chinese Academy of Sciences; 030001 Taiyuan P. R. China