1. Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 China
2. School of Chemical Engineering; Beijing Institute of Petrochemical Technology; Beijing 102617 China
3. State Key Laboratory of Coal Conversion; Institute of Coal Chemistry, Chinese Academy of Sciences; P.O. Box 165 Taiyuan Shanxi 030001 P.R. China
4. Synfuels China; Beijing 100195 P.R. China
5. Key Laboratory for Colloid and Interface Chemistry, Key Laboratory of Special Aggregated Materials, School of Chemistry and Chemical Engineering; Shandong University; Jinan 250100 China