1. Green Catalysis Center and College of Chemistry Zhengzhou University Zhengzhou 450001 P. R. China
2. School of Chemical and Biomedical Engineering Nanyang Technological University 62 Nanyang Drive Singapore 637459 Singapore
3. KAUST Catalysis Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal 23955–6900 Saudi Arabia
4. Beijing Synchrotron Radiation Facility (BSRF) Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China