1. Coal
and Energy Technology Department, Technical Development Group, Kobe Steel, Limited, 2-3-1, Shinhama, Arai-cho, Takasago, Hyogo 676-8670, Japan
2. Technology
Department, Applied Chemistry Division, Kobelco Research Institute, Incorporated, 1-5-5, Takatsukadai, Nishi-ku, Kobe, Hyogo 651-2271, Japan
3. Center
for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan