1. Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering and College of Engineering, and BIC-ESAT Peking University Beijing 100871 P. R. China
2. State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences P.O. Box 165 Taiyuan Shanxi 030001 P. R. China
3. Synfuels China Beijing 100195 P. R. China
4. State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters College of Chemistry and Chemical Engineering Xiamen University Xiamen 36100 P. R. China