Affiliation: | 1. College of Resources and Environmental Sciences, Biomass Engineering Center, China Agricultural University, Beijing 100193 (P.R. China), Fax: (+86)?10‐6273‐3470;2. College of Chemistry and Chemical Engineering, Graduate University of the Chinese Academy of Sciences, Beijing 100049 (P.R. China), Fax: (+86)?10‐8825‐6092 |