MoS₂ is an attractive sulfur-resistant catalyst for directly converting sulfur-containing syngas to high value-added chemicals. However, the effect of the layered structure on the catalytic activity for CO hydrogenation reactions is far from clear. Herein, MoS₂/carbon composite catalysts with 1–8 stacking layers in MoS₂ crystallites are synthesized, and the impact of the layer numbers on the catalytic performance is probed for the low-temperature methanation of sulfur-containing syngas. The results indicate that the turnover frequency of CO methanation increases from 2.4 × 10^-3 to 3.7 × 10^-3 s⁻¹ with decreasing layer numbers of MoS₂ crystallites from 8.3 to 1.1. This result is thoroughly explained by the fact that the higher ratio of rim sites in MoS₂ crystallites with fewer layer numbers enhances the catalytic activity, which originates from the facilitated activation of CO and H₂. These understandings are important for the rational design and development of more efficient MoS₂-based catalysts for CO hydrogenation.

MoS ₂是一种有吸引力的抗硫催化剂，可将含硫合成气直接转化为高附加值化学品。然而，层状结构对CO加氢反应催化活性的影响尚不清楚。在此，合成了在MoS ₂微晶中具有1-8个堆积层的MoS ₂ /碳复合催化剂，并探讨了层数对含硫合成气低温甲烷化催化性能的影响。结果表明，随着MoS ₂层数的减少，CO甲烷化的周转频率从2.4 × 10 ^-3增加到3.7 × 10 ^-3 s ^-1微晶从 8.3 到 1.1。这一结果完全可以通过以下事实来充分解释：MoS ₂微晶中具有较少层数的较高比例的边缘位点增强了催化活性，这源于促进了 CO 和 H _{2 的}活化。这些理解对于合理设计和开发更有效的基于MoS ₂的 CO 加氢催化剂非常重要。