1. State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
2. College of Science, China University of Petroleum (East China), Qingdao 266580, PR China
3. Laboratoire Catalyse et Spectrochimie, Normandie University, ENSICAEN, UNICAEN, 6 boulevard du Marechal Juin, 14050 Caen, France