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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。
SiO 2 microspheres self-assembled with 30-150 nm SiO 2 microspheres were prepared by self-assembly. The WO 3 single-layered WO 3 -CO 2 catalysts were prepared by the same volume impregnation method and were subjected to low temperature nitrogen adsorption, mercury intrusion, temperature programmed ammonia desorption and Scanning electron microscopy and other characterization, and then C2H4-C10H20 disproportionation reaction. The results show that under the same experimental conditions, the pore size of the spherical SiO2 model carrier with the same pore structure has an important effect on the reaction result. The larger the catalyst pore size, the higher the initial ethylene conversion and propylene selectivity, the faster the reaction deactivation, ie, the internal diffusion has a significant effect on the disproportionation reaction of C2H4-C10H20.