1. State Key Laboratory of Heavy Oil Processing College of Chemistry and Chemical Engineering China University of Petroleum (East China) Qingdao 266580 Shandong P. R. China
2. Laboratoire Catalyse et Spectrochimie (LCS) Normandie Université, ENSICAEN, UNICAEN, CNRS 6 boulevard Maréchal Juin Caen 14050 France