Tailoring of Surface Acidic Sites in Co–MoS 2 Catalysts for Hydrodeoxygenation Reaction

作者：Yijin Zhang, Tangkang Liu, Qineng Xia, Hongyan Jia, Xinlin Hong, Guoliang Liu · 发表于：The Journal of Physical Chemistry Letters · 年份：2021 · DOI：10.1021/acs.jpclett.1c01201 · 被引用次数：39 · 研究领域：Catalysis and Hydrodesulfurization Studies、Electrocatalysts for Energy Conversion、Corrosion Behavior and Inhibition

CoMo sulfides are typical catalysts for selective hydrodeoxygenation (HDO) of phenolics to aromatics which is important in bio-oil upgrading. However, it is still a challenge to promote the intrinsic activity of Co–MoS 2 catalysts. Defect chemistry provides a good option to improve surface reactivity in catalysis. In this work, we report a facile H 2 O 2 etching method to tailor the concentration of surface acidic sites. The molar ratio of H 2 O 2 /MoS 2 can be altered to tune sulfur defects on the MoS 2 surface for stabilizing Co species to form CoMoS active sites. The optimized Co–MoS 2 -2 catalyst, with the highest concentration of acidic sites, exhibits 3.4 times higher activity than the Co–MoS 2 -0 sample in the HDO of p -cresol to toluene. It is also found the HDO activity shows a linear relationship with the amount of surface acid (both Lewis and Brønsted acid) over the Co–MoS 2 - x catalysts. We believe that the understanding of the role of surface acidity would provide new opportunities for the rational design of efficient Co–MoS 2 catalysts.