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首页> 外文会议>American Chemical Society national meeting >Fischer-Tropsch Synthesis: Effect of Pt Promoter on Activity, Selectivities to Hydrocarbons and Oxygenates, and Kinetic Parameters over 15Co/Al_2O_3
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Fischer-Tropsch Synthesis: Effect of Pt Promoter on Activity, Selectivities to Hydrocarbons and Oxygenates, and Kinetic Parameters over 15Co/Al_2O_3

机译：Fischer-Tropsch合成：Pt启动子对活性的影响，对碳氢化合物和含氧的选择性，以及15％CO / AL_2O_3的动力学参数

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The effect of Pt promoter on the catalytic performance of 15%Co/Al_2O_3 catalyst was studied in a 1-L continuously stirred tank reactor (CSTR). Catalytic performance parameters investigated include catalyst activity, CH4 and C5+ selectivities, olefin and paraffin contents, 1 -olefin and 2-olefin selectivities, oxygenate selectivity, and kinetic behavior. The addition of 0.5% Pt increased the CO hydrogenation rate constant by 140%, consistent with the finding that the Pt promoter significantly increased Co reduction and thus the number of surface Co0 sites. However, Pt did not alter Co site time yield (STY). Both the unpromoted and Pt promoted 15%Co/Al_2O_3 catalysts displayed the same Co STY value at 220°C, 5.5×10~(-3) s~(-1). A comparison of selectivities of the unpromoted and Pt promoted 15%Co/Al_O_3 was made at similar CO conversion levels. The Pt promoter increased light hydrocarbon (C_2-C_4) formation and simultaneously decreased heavier hydrocarbon formation, probably due to hydrogen dissociation on Pt metal and spillover onto Co metal, leading to an increase in the chain termination rate. Pt promoter did not apparently change the overall olefin and paraffin contents, but CO conversion was found to be a primary factor in influencing secondary reactions of olefins on the 15%Co/Al_2O_3 catalyst. Furthermore, 0.3-1.0% water soluble oxygenates were found to be formed on the Co catalyst. At similar CO conversion levels, Pt slightly improved the oxygenates selectivity. Effects of CO conversion and H_2/CO ratio on hydrocarbon and oxygenate selectivities are also discussed in this paper. Finally, the kinetic behavior of both unpromoted and Pt promoted 15%Co/Al_2O_3 catalysts was studied using the CAER kinetic model, -r_(CO) = kPCo~aP_(H_2)~b/( 1 + _mP_(H_2O)/P_(H_2). Kinetic parameters for both catalysts were assessed and are reported in this study.
机译：铂启动子的15％的Co / Al2O3催化剂的催化性能的影响在1升连续搅拌釜反应器（CSTR）进行了研究。催化性能参数研究包括催化剂活性，CH4和C5 +选择性，烯烃和链烷烃含量，1-烯烃和2-烯烃选择性，含氧化合物的选择性，和动力学行为。加入0.5％的Pt 140％增加了CO加氢速率常数，与发现一致的是，启动子的Pt增加显著CO降低并且因此表面CO0位点的数目。然而，铂并没有改变CO站点时收率（STY）。无论是未促进和Pt促进15％的Co / Al_2O_3的催化剂在220℃下显示相同的钴STY值，5.5×10〜（-3）S〜（-1）。未促进的和Pt中的选择性的比较促进15％的Co / Al_O_3在类似CO转化水平作出。将Pt启动子增加了轻质烃（C_2-C_4）的形成和在Pt金属和溢出到Co金属同时减少较重烃地层，可能是由于氢解离，从而导致增加了链终止速率。铂启动子没有明显改变总体的烯烃和链烷烃含量，但是CO转化被认为是在对15％的Co / Al2O3催化剂影响烯烃的二次反应的主要因素。此外，发现0.3-1.0％的水溶性含氧化合物要在钴催化剂形成。在类似的CO转化率水平，铂略有改善的含氧化合物的选择性。本文还讨论了CO转化率和H_2 / CO上的烃和含氧化合物的选择性比率的影响。最后，无论是未促进和Pt组成的动力学行为促进使用CAER动力学模型，-r_（CO）= kPCo〜AP_（H_2）〜B /（1 + _mP_（H2O）/ P_（15％的Co / Al_2O_3的催化剂进行了研究H_2）的两种催化剂动力学参数进行了评估，并在此研究报告。

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