Mn-doped spinel oxides CoAl₂O₄ marked as CMA-m (m = Co/Mn atom ratio) herein were synthesized and evaluated for the first time as supports of Co-based Fischer-Tropsch synthesis (FTS) catalysts. HAADF-STEM images showed that Mn doping caused more crystal defects on the surface of CMA-m grains, which may provide more attachment sites for cobalt loading, leading to much smaller Co⁰ particle size of 15Co/CMA-m than that of 15Co/CoAl₂O₄. Data of H₂/CO chemisorption showed that the interaction of highly dispersed Co⁰ with lattice Mn-doped CMA-m grain has a promotive effect on CO adsorption capability. FTS evaluation results demonstrate that 15Co/CMA-20 showed the highest CO conversion, C₅₊ selectivity and C₅₊ STY, benefiting from its high Co⁰ dispersion and CO chemisorption capability as a result of suitable Mn doping into the lattice of CoAl₂O₄, which was confirmed very different from the influence of impregnated Mn oxide over CoAl₂O₄.

本文首次合成并评估了标记为 CMA-m（m = Co/Mn 原子比）的Mn 掺杂尖晶石氧化物 CoAl ₂ O ₄作为 Co基费托合成（FTS）催化剂的载体。HAADF-STEM 图像显示，Mn 掺杂导致 CMA-m 晶粒表面出现更多的晶体缺陷，这可能为钴负载提供更多的附着位点，导致15Co/CMA-m 的Co ⁰粒径远小于15Co/ CoAl ₂ O ₄。H ₂ /CO 化学吸附数据表明，高度分散的 Co ⁰具有晶格 Mn 掺杂的 CMA-m 晶粒对 CO 吸附能力有促进作用。FTS 评估结果表明，15Co/CMA-20 表现出最高的 CO 转化率、C ₅₊选择性和 C ₅₊ STY，这得益于其高 Co ⁰分散性和 CO 化学吸附能力，这是由于适当的 Mn 掺杂到 CoAl ₂晶格中的结果O ₄，这被证实与浸渍的 Mn 氧化物对 CoAl ₂ O ₄的影响非常不同。