In this research work, a simple, one-step and environmentally friendly method is reported for synthesizing metallic Co nanoparticles (NPs) and its application in Fischer–Tropsch Synthesis. In this attractive method, metallic CoNPs decorated on the alumina surface are prepared by auto-reduction of cobalt (II) formate dihydrate at 380 °C for 4 h under high-pure nitrogen atmosphere. During the thermal decomposition process, hydrogen and carbon monoxide gases, which are reducing agents, are released. The decomposed samples were directly used in the reaction without typical hydrogen pretreatment. For comparison, the Co/γ-Al₂O₃ catalyst was also prepared by the traditional impregnation method, which includes the calcination and reduction steps. Different characterization techniques including TGA-DTA, XRD, FESEM, EDX mapping and BET were carried out to investigate the structural and textural properties of samples. CO conversion of the auto-reduced Co/γ-Al₂O₃ catalyst was almost twofold of the reduced catalyst by H₂. The characterization data indicated that auto-reduction method leads to better dispersion and smaller CoNPs production than those prepared by H₂ reduction pretreatment. Therefore, the active sites for the reaction increased, leading to an increase in CO conversion. The results suggested that the catalyst reduction under H₂ stream is unnecessary.

在这项研究工作中，报道了一种简单、一步且环保的方法来合成金属钴纳米粒子 (NPs) 及其在费托合成中的应用。在这种有吸引力的方法中，在高纯氮气氛下，通过在 380°C 下自动还原甲酸钴 (II) 二水合物 4 小时，制备了装饰在氧化铝表面上的金属 CoNP。在热分解过程中，会释放出氢气和一氧化碳气体，它们是还原剂。分解后的样品直接用于反应，无需典型的氢气预处理。为了比较，Co/γ-Al ₂ O ₃催化剂也采用传统的浸渍法制备，包括煅烧和还原步骤。进行了不同的表征技术，包括 TGA-DTA、XRD、FESEM、EDX 映射和 BET，以研究样品的结构和纹理特性。自动还原的 Co/γ-Al ₂ O ₃催化剂的CO 转化率几乎是由 H ₂还原的催化剂的两倍。表征数据表明，自动还原方法比通过 H ₂还原预处理制备的方法具有更好的分散性和更小的 CoNPs 产量。因此，反应的活性位点增加，导致 CO 转化率增加。结果表明，H ₂下的催化剂还原 流是不必要的。