1. College of Chemistry & Chemical Engineering, Inner Mongolia University, Hohhot 010021, PR China
2. Inner Mongolia Key Laboratory of Fine Organic Synthesis, Hohhot 010021, PR China
3. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, PR China
4. National Energy Center for Coal to Clean Fuels, Synfuels China Co., Ltd., Huairou District, Beijing 101400, PR China