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本文详细报道了制备因素对Na-W-Mn—O/SiO_2催化剂反应性能的影响,并用O_2-TPD,XRD,FT-IR,LRS等方法对催化剂进行了表征。结果表明,该催化剂的最佳组成是Mn 0.32wt％—Na_2WO_4 4wt％/SiO_2,由混浆法制备的催化剂具有较好的稳定性,连续反应30 h后,其甲烷转化活性和C_2烃收率均保持不变。催化剂的结构研究表明,Na_2WO_4与SiO_2发生了相互作用,形成有Si参与的表面钨氧物种,该催化剂具有较好的催化活性与表面钨氧物种的形成相关联,Mn的加入,可能大大提高了该催化剂中表面晶格氧的浓度,从而加快了CH_4的活化速度。
The effects of preparation factors on the catalytic performance of Na-W-Mn-O / SiO 2 catalysts were reported in detail. The catalysts were characterized by O 2 -TPD, XRD, FT-IR and LRS methods. The results show that the optimum composition of the catalyst is Mn 0.32wt% -Na_2WO_4 4wt% / SiO_2. The catalyst prepared by the slurry mixing method has good stability. After the continuous reaction for 30 h, the methane conversion activity and C_2 hydrocarbon yield All remain unchanged. The structure of the catalyst shows that Na_2WO_4 interacts with SiO_2 to form the surface tungsten oxide species with the participation of Si. The catalyst has better catalytic activity and is associated with the formation of surface tungsten oxygen species. The addition of Mn may be greatly enhanced The surface lattice oxygen concentration of the catalyst, thereby accelerating the activation rate of CH 4.