1. Department of Chemical EngineeringTaiyuan University of Technology Taiyuan 030024 P.R. China
2. Analytical Instrumentation CenterInstitute of Coal ChemistryChinese Academy of Sciences Taiyuan 030001 P.R. China
3. Energy Conversion Engineering LaboratoryInstitute of Regional Innovation (IRI)Hirosaki University 2-1-3, Matsubara Aomori 030-0813 Japan