The activities of cobalt catalysts prepared by the microemulsion impregnation method on carbon nanotubes (CNTs) and functionalised carbon nanotubes (FCNTs) supports were evaluated in the Fischer–Tropsch synthesis (FTS). The catalysts were characterised by transmission electron microscopy, X-ray diffraction and Brunauer–Emmett–Teller surface area methods. The results show that the cobalt particles in the FCNTs support are mostly located inside the tubes of the CNTs and show a narrower particle size distribution. The experimental results show that the cobalt catalyst supported on FCNTs leads to a higher CO conversion and FTS activity compared to that supported on normal CNTs. Calculated kinetic results show that the activation energies fall within the narrow range of 101.1–107.1 kJ mol−1 and the heat of hydrogen adsorption was calculated to be −40.2 and −26.2 kJ mol−1 for Co/CNTs and Co/FCNTs catalysts respectively. FCNTs, as a catalyst support of Co nanoparticles, maintain high dispersion which can be attributed to a hydrogen spillover effect of functional groups on the CNT surface.

中文翻译：

---

Co/CNTs 催化剂上费-托合成的内在动力学：载体相互作用的影响

在费-托合成（FTS）中评估了通过微乳液浸渍法制备的钴催化剂在碳纳米管（CNT）和功能化碳纳米管（FCNT）载体上的活性。通过透射电子显微镜、X 射线衍射和Brunauer-Emmett-Teller 表面积方法对催化剂进行了表征。结果表明，FCNTs 载体中的钴颗粒大多位于 CNTs 管内，粒径分布较窄。实验结果表明，与负载在普通碳纳米管上的钴催化剂相比，负载在 FCNT 上的钴催化剂导致更高的 CO 转化率和 FTS 活性。计算的动力学结果表明，活化能在 101.1-107.1 kJ mol-1 的窄范围内，氢吸附热计算为 -40。Co/CNTs 和 Co/FCNTs 催化剂分别为 2 和 -26.2 kJ mol-1。FCNTs 作为 Co 纳米颗粒的催化剂载体，保持高分散性，这可归因于官能团在 CNT 表面的氢溢出效应。