1. Zhang Dayu College of Chemistry Dalian University of Technology Dalian 116024 P. R. China
2. National Engineering Laboratory for Methanol to Olefins Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
3. State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 P. R. China