1. State Key Laboratory of Coal Conversion; Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan Shanxi 030001 P.R.China
2. National Energy Center for Coal to Liquids; Synfuels China Technology Co., Ltd; Beijing 101400 P.R.China
3. Department of Chemistry; University of California, Berkeley; Berkeley CA 94720 USA
4. Department of Chemistry and Biochemistry, Miami University; Oxford OH 45056 USA
5. Department of Chemistry; National Cheng Kung University; Tainan 701 Taiwan