1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, NO. 18 Fuxue Road, Changping Area, Beijing 102249, P. R. China
2. Hydrocracking Center, Dalian Research Institute of Petroleum and Petrochemicals, SINOPEC, NO. 96 Nankai Street, Lvshunkou Area, Dalian 116041, P. R. China