1. College of Chemistry and Chemical EngineeringTaiyuan University of Technology Yingze West Street 79, Taiyuan Shanxi 030024 PR China
2. Particle Technology Research Centre, Department of Chemical and Biochemical EngineeringThe University of Western Ontario, 1151 Richmond St London Ontario N6A 5B9 Canada
3. College of Materials Science and EngineeringTaiyuan University of Technology Yingze West Street 79, Taiyuan Shanxi 030024 PR China
4. State Key Laboratory of Coal ConversionInstitute of Coal Chemistry, Chinese Academy of Sciences Taoyuan South Road 27, Taiyuan, Shanxi 030024 PR China