A series of Fe₃O₄ catalysts supported on chitosan (CTS) were prepared through successive hydrothermal synthesis, cross-linking, and mechanical mixing of CTS. The prepared catalysts were characterized by SEM, XRD, N₂ adsorption-desorption, XPS, FT−IR, TG, H₂−TPR, CO−TPD, C₃H₆−TPD, and contact angle (CA) analysis, then evaluated for their performance in the Fischer-Tropsch synthesis (FTS). CTS supported Fe₃O₄ catalyst increased the hydrophilicity of the pristine un-supported Fe₃O₄. Results revealed that the catalysts exhibit high activity with tuned product distribution in FTS. The water gas shift reaction is facilitated over the Fe₃O₄/CTS catalysts, and their selectivity for light olefins is significantly improved by inhibiting the secondary reaction of the initial olefins, which was confirmed by C₃H₆−TPD experiments. The Fe₃O₄ particle size has a significant influence on product distribution, with larger Fe₃O₄ particles being beneficial to the formation of light olefins. The 30 % Fe₃O₄/CTS catalyst has light olefin selectivity of 35 % with an O/P value of 2.19, which are higher than those of 21 % and 0.62 over the pristine Fe₃O₄.

中文翻译：

---

在费托合成中具有增强的轻烯烃选择性的亲水负载型 Fe3O4 催化剂

通过连续水热合成、交联和机械混合CTS，制备了一系列负载在壳聚糖(CTS)上的Fe ₃ O ₄催化剂。制备的催化剂通过SEM、XRD、N ₂吸附-解吸、XPS、FT-IR、TG、H ₂ -TPR、CO-TPD、C ₃ H ₆ -TPD和接触角（CA）分析进行表征，然后进行评估因其在费托合成 (FTS) 中的表现。CTS负载的Fe ₃ O ₄催化剂增加了原始未负载Fe ₃ O ₄的亲水性. 结果表明，该催化剂在 FTS 中表现出高活性和调节的产物分布。Fe ₃ O ₄ /CTS 催化剂促进了水煤气变换反应，并且通过抑制初始烯烃的二次反应显着提高了它们对轻烯烃的选择性，C ₃ H ₆ -TPD 实验证实了这一点。Fe ₃ O ₄粒径对产物分布有显着影响，较大的Fe ₃ O ₄颗粒有利于轻烯烃的形成。30% Fe ₃ O ₄/CTS催化剂的轻烯烃选择性为35%，O/P值为2.19，高于原始Fe ₃ O ₄的21%和0.62 。