[1] China Univ Petr, Inst New Energy, 18 Fuxue Rd, Beijing 102200, Peoples R China
[2] Univ Rostock, Fac Agr & Environm Sci, Justus von Liebig Weg 6, D-18059 Rostock, Germany
[3] Heilongjiang Longneng Weiye Environm & Technol Sh, Floor 17,Sci & Technol Plaza, Harbin, Heilongjiang, Peoples R China
[4] Deutsch Biomasseforsch Zentrum gGmbH DBFZ, Biochem Convers Dept, Torgauer Str 116, D-04347 Leipzig, Germany