1. Institute of Coal Chemistry Department; Chinese Academy of Sciences; Taiyuan 030001 P.R. China
2. University of Chinese Academy of Sciences; Beijing 100049 P.R. China
3. College of Electronic Science and Technology; Shenzhen University; Shenzhen 518060 P.R. China
4. Ceramics Department; National Research Centre; El Bohouth Str 12622 Cairo Egypt
5. State Key Laboratory of Biomass Thermal Chemistry Technology; Wuhan Hubei 430223 P.R. China