1. Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China
2. School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
3. Institute of Molecular Science, Shanxi University, Taiyuan 030006, China
4. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China