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《JOURNAL OF MOLECULAR CATALYSIS (CHINA)》 2000-02
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Study on Methane Activation over Na- W -Mn/SiO_2 Catalysts Ⅱ. Active Oxygen Species

JI Sheng fu, LI Shu ben, XUE Jing zhen, LIU Yu, XU Chuan zhi (State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, The Chinese Academy of Sciences, Lanzhou 730000)  
Na W Mn/SiO 2 catalysts containing different amounts of sodium, tungsten, and manganese were prepared and their active oxygen species for activating methane were investigated using O 2 temperature program desorption (O 2 TPD) and CH 4 pulse reaction(CH 4 PR) techniques. The experimental results indicate that the active oxygen species over Na W Mn/SiO 2 catalysts for activating methane is the mobile surface lattice oxygen (O 2- ) supplied by tungsten and manganese oxides. Sodium can strongly polarize the metal oxygen bonds of the tungsten and manganese oxides and increase the mobility of their surface lattice oxygen. There is a synergic effect of sodium, tungsten, and manganese components to activate methane with the surface lattice oxygen over Na W Mn/SiO 2 catalysts.
【Fund】: 国家攀登计划预选项目! ( 95 -预 -3 6-1.1)
【CateGory Index】: O643.31
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