1. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, No. 66 Changjiang West Road, Qingdao, Shandong Province266580, China
2. School of Energy and Environment, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, China
3. College of Environment and Resources, Xiangtang University, Xiangtan, Hunan Province, China
4. Center for Environmentally Beneficial Catalysis, University of Kansas, Lawrence, Kansas 66049, United States