1. State
Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China
2. National
Energy Center for Coal to Clean Fuels, Synfuels China Co., Ltd., Huairou District,
Beijing 101400, P. R. China
3. Department
of Chemistry, University of California, Berkeley, California 94720, United States
4. Beijing
Guyue New Materials Research Institute, Beijing University of Technology, Beijing 100124, P. R. China
5. Theoretical
Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, United States