Higher alcohol synthesis (HAS) from syngas is a potential energy conversion route which has attracted extensive interest from both academia and industry. Co–Co₂C catalysts are promising candidates for HAS, but the yield of higher alcohols (HAs) and catalyst stability still need to be promoted. Here, a series of carbon-coated ordered mesoporous silica (OMS) supported cobalt catalysts were prepared with modulated carbon layer thicknesses. Co/10C/OMS with a carbon layer of 0.55 nm achieved an optimal ROH selectivity of 41.3%, space time yield (STY) towards a HA of 23.7 mmol g_cat⁻¹ h⁻¹ and stability over 300 h. As the carbon layer thickened, particle dispersion was facilitated and the metal-support interaction was modulated, which resulted in the volcanic variation of the surface Co₂C/Co⁰ ratio. In addition, compared to a carbon-coated amorphous SiO₂ supported sample, significant CO enrichment was observed inside the ordered mesopores in Co/xC/OMS, which enhanced the CO insertion and C–C coupling, boosting the selectivity of HA. This work may give insights into the use of carbon–silica composite supports and the design of high-performance Co–Co₂C catalysts for HAS.

中文翻译：

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碳包覆有序介孔二氧化硅负载 Co-Co2C 催化剂，促进 CO 插入和 C-C 偶联，用于合成气合成高级醇

合成气合成高级醇（HAS）是一种潜在的能源转化途径，引起了学术界和工业界的广泛兴趣。 Co-Co ₂ C催化剂是HAS的有希望的候选者，但高级醇（HA）的产率和催化剂稳定性仍需要提高。在此，制备了一系列具有调节碳层厚度的碳包覆有序介孔二氧化硅（OMS）负载钴催化剂。具有0.55 nm碳层的Co/10C/OMS实现了41.3%的最佳ROH选择性、23.7 mmol g _cat ^-1 h ^-1的HA的时空产率（STY）和300小时以上的稳定性。随着碳层增厚，颗粒分散得到促进，金属-载体相互作用得到调节，导致表面Co ₂ C/Co ⁰比值发生火山变化。此外，与碳包覆的无定形SiO ₂负载样品相比，在Co/ x C/OMS的有序介孔内观察到显着的CO富集，这增强了CO插入和C-C耦合，提高了HA的选择性。这项工作可能有助于深入了解碳-二氧化硅复合载体的使用以及用于 HAS 的高性能 Co-Co ₂ C 催化剂的设计。