1. State Key Laboratory of Coal ConversionInstitute of Coal ChemistryChinese Academy of Sciences Taiyuan 030001 P.R.China
2. University of Chinese Academy of Sciences Beijing 100049 P.R. China
3. China National Engineering Research Center for Coal-Based SynthesisInstitute of Coal ChemistryChinese Academy of Sciences Taiyuan 030001 P.R. China
4. Technology CenterShanxi Lu'an Mining (Group) Co.Ltd. Changzhi 046204 P.R. China