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Synthesis, Characterization and Catalytic Behavior of V-Si-β Molecular Sieves

YU Ling 1, HE Hong-Yun 1*, HE Chi-Jian 1, ZHU Hua-Yuan 1, WEN Jian-Jun 1, PANG Wen-Qin 2 (1. College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China; 2. State Key Laboratory of Inorganic Synthesis & Preparative Chemistry, Jilin University, Changchun 130012, China)  
V-β molecular sieves through isomorphous replacement of Si by V in zeolite β were successfully synthesized via hydrothermal procedure. The synthesis conditions were as follows: the molar chemical composition of the mixture: 60SiO_ 2-xV_ 2O_ 5-y(TEA)_ 2O-zH_ 2O-wNH_ 4F ( 1≤x≤6, y≥16, 500≤z≤800, w≥5 ), reaction temperature 413 K, reaction time 12 d. The synthesized samples are characterized by XRD, IR, UV-Vis, TG, DTA and SEM. The results confirm that V-β molecular sieves contain a β phase of good species, and show the presence of V iron in the framework position. In the system the catalytic behavior of V-β molecular sieves in the hydroxylation of phenol with H_ 2O_ 2 as the oxidant was also investigated.
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