Affiliation: | 1. Catalysis Research Centre, Hokkaido University, Sapporo 001‐0021 (Japan), Fax: (+81)?11‐706‐9126 http://www.cat.hokudai.ac.jp/osawa/member/ye/index.html;2. On leave from the College of Science, Beijing Institute of Technology, Beijing (China);3. PRESTO (Japan) Science and Technology Agency (JST), Tokyo (Japan) |