1. College of Material Science and Engineering, Hebei University of Engineering
2. Handan 056038
3. People's Republic of China
4. State Key Laboratory of Heavy Oil and Beijing Key Lab of Oil & Gas Pollution Control
5. China University of Petroleum
6. Beijing 102249
7. P. R. China
8. Department of Chemistry
9. University of Tennessee-Knoxville
10. Tennessee 37996-1600
11. USA