1. Research Center of Green Catalysis College of Chemistry College of Mechanical and Power Engineering Zhengzhou University 100 Science Road Zhengzhou 450001 P. R. China
2. College of Chemistry and Chemical Engineering Henan Polytechnic University 2001 Century Avenue Jiaozuo 454000 P. R. China
3. Institute of Chemical Industry of Forest Products CAF National Engineering Laboratory for Biomass Chemical Utilization Nanjing 210042 P. R. China
4. Department of Chemistry Tsinghua University Beijing 100084 P. R. China