1. State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Changping District, Beijing 102249, China
2. Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, University of Texas at Austin, Austin, Texas 78712-0231, USA
3. Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
4. Institute of Catalysis for Energy and Environment, Shenyang Normal University, Shenyang 110034, China