1. Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province
2. Taiyuan University of Technology
3. Taiyuan 030024
4. P. R. China
5. College of Chemistry and Chemical Engineering
6. Department of Chemical and Petroleum Engineering
7. University of Wyoming
8. Laramie
9. USA
10. State Key Laboratory of Coal Conversion
11. Institute of Coal Chemistry
12. Chinese Academy of Sciences
13. Taiyuan 030001