1. Department of Applied Chemistry School of Engineering University of Toyama Gofuku 3190 Toyama 930-8555 Japan
2. Jiangsu Province Engineering Research Center of Fine Utilization of Carbon Resources China University of Mining & Technology Jiangsu Xuzhou 221116 P. R. China
3. State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan Shanxi 030001 P. R. China