1. Institute of Catalysis for Energy and Environment, College of Chemistry & Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning 110034, P. R. China
2. Qiqihar Medical University, Qiqihar, Heilongjiang 161006, P. R. China
3. State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum, Beijing 102249, P. R. China