1. College of Materials Engineering; Shanghai University of Engineering Science; Shanghai 201620 P.R. China
2. Institute of Physical Chemistry; University of Innsbruck; Innrain 80-82 Innsbruck Austria
3. Department of Chemical and Biomolecular Engineering; University of Houston; Houston Texas 77204-4004 USA
4. Key Laboratory of Biofuels; Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences; Qingdao 266101 P.R. China
5. State Key Laboratory of Coal Conversion; Institute of Coal Chemistry, Chinese Academy of Sciences; Taiyuan Shanxi 030001 P. R. China