1. Department of Chemistry Tsinghua University Beijing 100084 PR China
2. Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 PR China
3. State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 PR China
4. SINOPEC Research Institute of Petroleum Processing Xue Yuan Rd. 18 Beijing 100083 PR China
5. Shanghai Synchrotron Radiation Facilities Shanghai Institute of Applied Physics Chinese Academy of Science Shanghai 201204 PR China
6. Institute of Physics Chinese Academy of Sciences Beijing 100190 PR China