1. School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui 230601, China
2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China
3. National Energy Center for Coal to Liquids, Synfuels CHINA Company, Ltd., Huairou District, Beijing 101400, P. R. China