1. Beijing Key Laboratory of Lignocellulosic Chemistry, Engineering Research Center of Forestry Biomass Materials and Energy, Ministry of Education, Beijing Forestry University, Beijing 100083, P. R. China
2. Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, P. R. China
3. National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, P. R. China
4. State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, P. R. China