1. State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum (East China) Qingdao 266580 China
2. College of ScienceChina University of Petroleum (East China) Qingdao 266580 China
3. College of Chemistry and Materials ScienceAnhui Normal University Wuhu 241000 China
4. School of Chemistry and EngineeringAnhui University of Technology Maanshan 243002 China
5. Department of ChemistryTsinghua University Beijing 100084 China
6. Beijing Synchrotron Radiation FacilityChinese Academy of Sciences Beijing 100049 China
7. School of Material Science and EngineeringChina University of Petroleum (East China) Qingdao 266580 China