Selective synthesis of mixed alcohols from syngas (CO + H₂) via Fischer–Tropsch synthesis (FTS) is an alternative one-step one-pot method. Here we report a series of Co-based catalysts supported by activated carbon (AC) and promoted by Mn and La, namely, CoxMnyLa/AC, over which the selectivity to alcohols is usually ∼26.8% and up to 31.7% at elevated reaction pressure, accompanied by a large amount of olefin byproducts (∼30%) that can be further converted to alcohols via a hydroformylation process. Detailed characterizations are performed for the structural properties of catalysts, including physisorption, chemisorption, microscopy, crystal structure, and surface element compositions. The active site of CoxMnyLa/AC catalysts is the highly dispersed metallic Co on the surface of Co₂C nanoparticles ([email protected]₂C), similar to that of CoxMn/AC catalysts reported previously, while that of CoyLa/AC catalysts is a combination of metallic Co and Co₂C phases (Co–Co₂C). The result indicates that Mn promoter plays a determinative role in the formation of active sites over CoxMnyLa/AC catalysts. Nevertheless, the La promoter tends to aggregate on the surface of cobalt nanoparticles in the form of La₂O₃ to promote the CO insertion step and enhance the H₂ chemisorption, so that it can both facilitate the formation of alcohols and make the FTS product class shift to light components. The result proves that the structure of active sites can be established by adding a strong promoter such as Mn, and a second promoter, such as La, can be used to tune the FTS reaction toward alcohols by further modifying its surface properties.

通过费-托合成法（FTS）从合成气（CO + H ₂）中选择性合成混合醇是另一种单步一锅法。在这里，我们报告了一系列由活性炭（AC）负载并受Mn和La促进的Co基催化剂，即Co x Mn y La / AC，其对醇的选择性通常约为26.8％，最高可达31.7％。在升高的反应压力下，伴有大量的烯烃副产物（约30％），这些副产物可以通过加氢甲酰化工艺进一步转化为醇。对催化剂的结构特性进行了详细的表征，包括物理吸附，化学吸附，显微镜，晶体结构和表面元素组成。Co x Mn y的活性位La / AC催化剂是Co ₂ C纳米颗粒（[受电子邮件保护] ₂ C）表面上高度分散的金属Co ，类似于先前报道的Co x Mn / AC催化剂，而Co y La / AC催化剂则是金属Co和Co ₂ C相（Co–Co ₂ C）的组合。结果表明，Mn助催化剂在Co x Mn y La / AC催化剂上活性位的形成中起决定性作用。然而，La促进剂倾向于以La ₂ O ₃的形式聚集在钴纳米颗粒的表面上，以促进CO插入步骤并增强H _2。化学吸附作用，因此既可以促进醇的形成，又可以使FTS产品类别转向轻组分。结果证明，可以通过添加强促进剂例如Mn来建立活性位点的结构，并且可以使用第二种促进剂例如La通过进一步修饰其表面性质来调节FTS向醇的反应。