Elucidating the layer-number impact of MoS2 on the adsorption and hydrogenation of CO
2021
He, Jia-Xin | Xiao, Yong-Shan | Liu, Chang | Zhu, Min-Li | Song, Yong-Hong | Liu, Zhong-Wen
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.
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