1. State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580 China
2. Department of Chemical Engineering Norwegian University of Science and Technology 7491 Trondheim Norway
3. Laboratoire Catalyse et Spectrochimie Normandie University, ENSICAEN UNICAEN CNRS 6 Bd Marechal Juin 14050 Caen France