1. State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences 030001 Taiyuan P. R. China
2. University of Chinese Academy of Sciences 100049 Beijing P. R. China
3. Dalian National Laboratory for Clean Energy Chinese Academy of Sciences 116023 Dalian P. R. China
4. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia University 750021 Yinchuan P. R. China