1. School of petroleum and chemical; Lanzhou University of Technology; Lanzhou 730050 China
2. State Key Laboratory for Oxo Synthesis and Selective Oxidation; National Engineering Research Center for Fine Petrochemical Intermediates; Lanzhou Institute of Chemical Physics; Chinese Academy of Sciences; Lanzhou 730000 China)Tel.: +86-931-4968083Fax: +86-931-4968019