1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 18 Fuxue Road, Beijing 102249, P. R. China
2. Petrochemical Research Institute, PetroChina Company Limited, Beijing 100195, P. R. China
3. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
4. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin 12489, Germany