合成气费托合成制重质烃Ru-Co/SiC催化剂的制备及性能

费托合成是以合成气生产清洁燃料和其他化学品的重要途径。传统费托合成产物遵循A-S-F分布，只有甲烷和重质烃的选择性没有极限值。因此，费托合成研究以最大程度地合成重质烃，提高合成产物中重质烃的选择性为目标。基于此，首先详细探究了Al₂O₃、SiO₂和SiC载体对费托反应性能的影响。结果表明 Co/SiC催化剂具有最高的CO转化率（83.5%）和C₅₊选择性（80.3%）。与浸渍法相比，原位还原法更为有效地引入Ru到Co/SiC催化剂，将C₅₊选择性提高至90.1%。Ru助剂能在保持较高催化活性不变的前提下，有效提高Co/SiC催化剂C₅₊选择性。催化剂表征（XRD、H₂-TPR、XPS、H₂-化学吸附和TEM）结果表明，Ru能与Co发生相互作用，提高了催化剂的可还原性和活性组分的分散性，进而改善了Co/SiC催化剂重质烃的选择性。

Preparation and catalytic performance of Ru-Co/SiC catalysts for the synthesis of heavy hydrocarbons from syngas by Fischer-Tropsch reaction

Fischer-Tropsch (F-T) synthesis is an important way to produce clean fuels and other chemicals from syngas. The traditional F-T synthesis follows Anderson-Schulz-Flory distribution, except for methane and heavy hydrocarbons, where its selectivity has no limit. Therefore, maximizing the yields of heavy hydrocarbons to further obtain high quality diesel and aviation kerosene by hydrocracking and hydroisomerization has been the research focus for F-T synthesis. The present work compared the effects of different supports (SiO₂, Al₂O₃ and SiC) on the catalytic performance of cobalt-based catalysts for F-T synthesis, in which SiC showed the highest activity (83.5%) and C₅₊ selectivity (80.3%). Compared to impregnation method, introducing Ru promoter by in-situ reduction method is more effective, with C₅₊ selectivity being further increased to 90.1%. Ru promoter could improve the C₅₊ selectivity while maintaining a high catalytic performance of Co/SiC catalyst. The characterization (XRD, H₂-TPR, XPS, H₂-chemisorption and TEM) results demonstrated the interaction between Ru and Co, thereby enhancing the reducibility and dispersion of active components and improved the selectivity for heavy hydrocarbons of Co/SiC catalyst.