摘要：蒸发自组装30~150 nm单分散SiO2微球制备孔径均一的SiO₂模型载体,采用等体积浸渍法制备WO₃单层负载WO₃-SiO₂催化剂并对其进行低温氮吸附、压汞、程序升温氨脱附和扫描电子显微镜等表征,然后进行C₂H₄-C₁₀H₂₀歧化反应实验。结果表明,在相同的实验条件下,相同孔道结构的球形SiO₂模型载体孔径对反应结果有重要的影响。催化剂孔径越大,起始乙烯转化率和丙烯选择性越高,反应失活也越快,即内扩散对C₂H₄-C₁₀H₂₀歧化反应有明显的影响。

关键词：模型载体；催化剂；歧化反应

Abstract：The spherical model support with uniform pore diameter were fabricated by ordered packing of 30~150 nm monodisperse SiO₂ microspheres.WO₃-SiO₂ metathesis catalysts of WO3 loading amount of monolayer were prepared through impregnation and characterized by means N₂ adsorption-desorption,mercury penetration,NH₃ temperature programmed desorption and SEM.The catalytic properties of WO₃-SiO₂ catalysts were evaluated in C₂H₄-C₁₀H₂₀ metathesis reaction under the same reaction conditions.The results showed that the catalytic properties of WO3-SiO2 model catalysts were dependent on the spherical model supports pore diameter with the same pore structure.The bigger pore size of the catalyst,the higher ethene conversion and propene selectivity in the initial stage of C2H4-C10H20 metathesis reaction.However,the deactivation rate of the catalyst was also higher,the internal diffusion had a strong influence on C₂H₄-C₁₀H₂₀ metathesis reaction.

Keywords：model support；catalyst；metathesiss