1. Research Centre of New Energy Science and Technology, Research Institute of Unconventional Oil & Gas and Renewable Energy; China University of Petroleum (East China); Qingdao 266580 P. R. China
2. College of Chemical Engineering; Qingdao University of Science and Technology; Qingdao 266042 P. R. China
3. College of Chemical and Environmental Engineering; Shandong University of Science and Technology; Qingdao 266590 P. R. China
4. State Key Laboratory of Heavy Oil Processing; China University of Petroleum (East China); Qingdao 266580 P. R. China