1. College of Chemistry and Chemical Engineering; Qingdao University; Qingdao 266071 Shandong P.R. China
2. State Key Laboratory of Heavy Oil Processing; China University of Petroleum; Qingdao 266555 Shandong P.R. China
3. CRRC Qingdao Sifang Co., Ltd.; Qingdao 266111 Shandong P.R. China