The present study investigates synthesis of liquid fuels and higher hydrocarbons via Fischer Tropsch (FT) reaction using combustion synthesis (CS) catalysts. The CS method employed citric acid (C₆H₈O₇) as fuel with lean stoichiometry (ϕ = 0.3, ϕ = 0.6) for the catalyst synthesis. CS reactions at lean conditions can be easily controlled, and holds the structural integrity of the catalyst support, resulting in no loss of active sites. The fuel-lean conditions show decreased formation of cobalt aluminates, resulting in high catalyst reducibility and larger fraction of active sites. When tested at constant space velocity, the CS catalysts achieve CO conversion up to 88%, which is 57% higher than the wet impregnation (WI) synthesized catalysts. Furthermore, the variation of the equivalence ratio allows to tailor the catalyst properties and thereby control conversion and selectivity of the CS catalysts. CS(ϕ = 0.6) showed a C₅₊ selectivity 31% higher compared to the CS(ϕ = 0.3). The liquid fuel space time yield (STY) ranged from 0.13 to 0.30 (g_C5+ g_cat^-1 h^-1) and it increases in the following order: WI < CS(ϕ = 0.3) < CS(ϕ = 0.6). These results emphasize the effectiveness of the CS method for the synthesis of FT catalysts and show the effect of the lean-fuel stoichiometry on the catalyst properties and performance.

本研究使用燃烧合成 (CS) 催化剂通过费托 (FT) 反应研究液体燃料和高级烃的合成。CS 方法使用柠檬酸 (C ₆ H ₈ O ₇) 作为用于催化剂合成的贫化学计量 (φ = 0.3, φ = 0.6) 的燃料。贫油条件下的 CS 反应可以轻松控制，并保持催化剂载体的结构完整性，从而不会损失活性位点。贫燃料条件显示铝酸钴的形成减少，导致高催化剂还原性和更大比例的活性位点。在恒定空速下测试时，CS 催化剂的 CO 转化率高达 88%，比湿浸渍 (WI) 合成催化剂高 57%。此外，当量比的变化允许调整催化剂性能，从而控制 CS 催化剂的转化率和选择性。CS(ϕ = 0.6) 显示 C ₅₊与 CS(ϕ = 0.3) 相比，选择性高 31%。液体燃料时空当量 (STY) 的范围为 0.13 到 0.30 (g _C5+ g _cat ^-1 h ^-1 )，并且按以下顺序增加：WI < CS(ϕ = 0.3) < CS(ϕ = 0.6)。这些结果强调了 CS 方法合成 FT 催化剂的有效性，并显示了贫燃料化学计量对催化剂性质和性能的影响。