CAJ | 학술논문

探讨了 MnOx 助剂对 Fe/SiO2 催化剂经由费-托反应(Fischer-Tropsch)制备低碳烯烃(FTO)的影响.通过浸渍法制备了 Fe20/SiO2 和 Fe20-Mn1.0/SiO2 催化剂,结果表明 MnOx 助剂显著提升了 CO 转化率和 C2~C4 烯烃的时空收率.程序升温吸附实验表明 MnOx 助剂增加了 Fe 基催化剂表面碱性,促进了 CO 的解离吸附.运用幂指数模型,研究了 Fe20/SiO2 和 Fe20-Mn1.0/SiO2 催化剂上 FTO 反应动力学,得到了各产物生成活化能与 H2/CO 反应级数.最后,结合动力学研究与程序升温表征结果,对 Fe 基催化剂 FTO 反应机理,尤其是 MnOx 助剂提高 Fe20/SiO2 催化剂上低碳烯烃选择性的作用进行了讨论.
탐토료 MnOx 조제대 Fe/SiO2 최화제경유비-탁반응(Fischer-Tropsch)제비저탄희경(FTO)적영향.통과침지법제비료 Fe20/SiO2 화 Fe20-Mn1.0/SiO2 최화제,결과표명 MnOx 조제현저제승료 CO 전화솔화 C2~C4 희경적시공수솔.정서승온흡부실험표명 MnOx 조제증가료 Fe 기최화제표면감성,촉진료 CO 적해리흡부.운용멱지수모형,연구료 Fe20/SiO2 화 Fe20-Mn1.0/SiO2 최화제상 FTO 반응동역학,득도료각산물생성활화능여 H2/CO 반응급수.최후,결합동역학연구여정서승온표정결과,대 Fe 기최화제 FTO 반응궤리,우기시 MnOx 조제제고 Fe20/SiO2 최화제상저탄희경선택성적작용진행료토론.
The promotional effects of MnOx on the synthesis of lower olefins via Fischer-Tropsch reaction over Fe/SiO2 catalysts were investigated. It was found that CO conversion and STY(space time yield) of C2—C4 olefins was greatly enhanced with the addition of MnOx. CO2-TPD and CO-TPD (temperature program desorption) have evidenced that MnOx could enhance the surface basicity of Fe-based catalyst. The intrinsic kinetics for Fischer-Tropschto reaction to lower olefins (FTO) was measured under the realistic reaction conditions over Fe/SiO2 catalysts with and without MnOx by fitting power-law model. The apparent activation energies and reaction orders were calculated based on the formation of products and CO conversion. With combination of kinetics and temperature-programmed techniques, it was found that the MnOx promoter can enhance the dissociation of CO and inhibite the readsorption of lower olefins, leading to the enhancement of STY and the selectivity to lower olefins. Finally, the FTO reaction mechanisms of Fe-based catalysts, especially, the promotional effects of MnOx on Fe/SiO2 for the production of lower olefins, were speculated.