1. Institute of Molecular Science; Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province; Shanxi University; Taiyuan 030006 PR China
2. State Key Laboratory of Materials-Oriented Chemical Engineering; College of Chemistry & Chemical Engineering; Nanjing University of Technology; No. 5 Xin Mofan Road Nanjing 210009 PR China
3. Analytical Instrumentation center, Institute of coal chemistry; Chinese Academy of Sciences; 27 South Taoyuan Road Taiyuan 030001 PR China
4. State Key Laboratory of Coal and CBG Co-ming; Shanxi Lanyan Coalbed Methane, Group Co. Ltd; Jincheng 048204 PR China
5. Department of Chemical Engineering; Curtin University; Perth WA 6845 Australia