1. Department
of Applied Chemistry,
Graduate School of Engineering, Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima 739-8527, Japan
2. Catalysis Research Center, Hokkaido University, N-21, W-10, Sapporo 001-0021,
Japan
3. Corporate Research
Laboratories, Mitsubishi Rayon Co., Ltd., Otake, Hiroshima 739-0693,
Japan