1. Department of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
2. East China Design Branch, China Petroleum Engineering & Construction Corporation, Qingdao 266071, PR China
3. Department of Chemistry, Tsinghua University, Beijing 100084, PR China
4. State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, PR China
5. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Shanghai 201204, PR China
6. Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim N-7491, Norway