1. State Key Laboratory of Heavy Oil Processing, The Key Laboratory of Catalysis of CNPC, College of Chemical Engineering and Environment, China University of Petroleum, Beijing 102249, P. R. China
2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, CAS, Taiyuan 030001, P. R. China
3. National Energy Center for Coal to Clean Fuels, Synfuels China Co., Ltd., Huairou District, Beijing 101400, P.R. China
4. College of Science, China University of Petroleum, No. 18 Fuxue Road, Changping, Beijing 102249, P. R. China