CoMn model catalysts were prepared by co-precipitation and evaluated for higher alcohol synthesis (HAS) via syngas. The selectivity to oxygenates (mainly alcohols and aldehydes) was found to be higher than 20 C% for the Na-promoted CoMn catalyst. Among the oxygenates, C₂₊ and C₆₊ fractions accounted for >90 wt% and ∼50 wt%, respectively. Metallic Co⁰ particles and MnCO₃ were found in both Na-promoted and unpromoted CoMn catalysts after the reaction, whereas Co₂C nanoparticles could only be observed in the spent Na-promoted catalyst. The addition of Na benefited the carbonization of cobalt and increased the selectivity to oxygenates and CO₂. Our studies thus suggested that Co/Co₂C were the bifunctional dual-sites for the oxygenates formation over the Na-promoted CoMn catalyst, where Co catalyzed CO dissociation and chain propagation, while Co₂C was responsible for CO non-dissociative activation and subsequent insertion. In addition, the sole Co₂C nanoparticles with certain exposed facets may also act as another kind of active dual-sites for oxygenates formation.

通过共沉淀制备CoMn模型催化剂，并通过合成气评估其高级醇合成（HAS）。对于Na促进的CoMn催化剂，发现对含氧化合物（主要是醇和醛）的选择性高于20％C。在含氧化合物中，C ₂₊和C ₆₊馏分分别占> 90 wt％和〜50 wt％。反应后在Na促进的和未促进的CoMn催化剂中均发现了金属Co ⁰颗粒和MnCO ₃，而Co ₂ C纳米颗粒只能在废Na促进的催化剂中观察到。Na的添加有利于钴的碳化，并增加了对含氧化合物和CO ₂的选择性。因此，我们的研究表明，Co / Co₂ C是在Na促进的CoMn催化剂上形成氧化物的双功能双位点，其中Co催化CO的解离和链增长，而Co ₂ C负责CO的非解离活化和随后的插入。另外，具有某些暴露的面的唯一的Co ₂ C纳米颗粒也可以充当另一种活性双位点以形成氧合物。