Abstract The optimization of cobalt oxide (Co3O4) loading on silica for the low-temperature Fischer-Tropsch (LTFT) synthesis process employing simulated nitrogen-rich syngas (50 vol%) to produce highly paraffinic biodiesel is studied. Four different amounts of Co3O4 varying from 15 to 36 wt% were loaded on silica in order to examine the catalytic performance of Co/SiO2 catalysts. The supported catalysts were characterized using XRF, nitrogen physisorption, XRD, TPR, DRIFT and SEM fixed with EDS analysis. The performances of the catalysts were examined in a single channel fixed bed reactor employing simulated nitrogen-rich syngas (CO:H2:N2 = 17:33:50 vol%). The reactor was operated at P = 20 bar, T = 237 °C and WHSV = 3.0 Nl/h.gcat. The active site concentration was maximized by (i) utilizing all the available surface area of the sphere's porous support, (ii) using ethanolic impregnation solution to hinder sintering of Co3O4 phases due to presence of ethoxyl groups, and (iii) connecting oxide crystallites to the neighbouring pores by increasing the active metal content. As a result, the production of heavy hydrocarbons per unit of time was maximized with 36 wt% cobalt loading on silica (CO conversion and C5+ selectivity were 87.65 and 81.78 mol%, respectively, and also paraffin: olefin ratio was 98:2).

中文翻译：

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在 Co3O4/SiO2 催化剂上通过 Fischer-Tropsch 过程使用模拟富氮合成气最大化石蜡与烯烃的比例

摘要 研究了使用模拟富氮合成气 (50 vol%) 生产高链烷烃生物柴油的低温费-托 (LTFT) 合成工艺中氧化钴 (Co3O4) 负载在二氧化硅上的优化。将四种不同量的 Co3O4 从 15 到 36 wt% 负载在二氧化硅上，以检查 Co/SiO2 催化剂的催化性能。使用 XRF、氮物理吸附、XRD、TPR、DRIFT 和 SEM 对负载型催化剂进行表征，并使用 EDS 分析进行固定。在采用模拟富氮合成气（CO:H2:N2 = 17:33:50 vol%）的单通道固定床反应器中检查催化剂的性能。反应器在 P = 20 bar、T = 237 °C 和 WHSV = 3.0 Nl/h.gcat 下运行。通过（i）利用球体的所有可用表面积来最大化活性位点浓度 s 多孔载体，(ii) 由于乙氧基的存在，使用乙醇浸渍溶液阻碍 Co3O4 相的烧结，以及 (iii) 通过增加活性金属含量将氧化物微晶连接到相邻的孔。结果，在二氧化硅上负载 36 wt% 的钴时，每单位时间的重烃产量最大化（CO 转化率和 C5+ 选择性分别为 87.65 和 81.78 mol%，石蜡：烯烃比为 98:2）。