Preparation of Defective Niobium-Based Catalysts to Address the “Seesaw Effect” in Phenol Hydrodeoxygenation

作者：Shi-Long Liu, Gege Pan, Miaomiao Wei, Baoyan Zhi, Yanchang Zhang, Chengjun Hu, Hao Li · 发表于：ACS Sustainable Chemistry & Engineering · 年份：2024 · DOI：10.1021/acssuschemeng.4c06155 · 被引用次数：4 · 研究领域：Catalysis and Hydrodesulfurization Studies、Catalysis for Biomass Conversion、Catalytic Processes in Materials Science

Cyclohexanone, a product of phenol hydrogenation, is a very reactive intermediate, which can easily generate byproducts such as cyclohexanol and cyclohexane, and there is a difficult-to-regulate “seesaw effect”. In this paper, a defective catalyst, Pd/Nb 2 O 5 -800-AP, was synthesized by the hydrothermal method at 170 °C and 1 MPa H 2, aiming to break the difficult equilibrium between the high conversion of phenol and the high selectivity of cyclohexanone, which has a good industrial prospect. By changing the calcination temperature of the carrier to control the surface defect content, Pd was placed in an electron-rich state, which promoted the activation of hydrogen molecules and adsorption of phenol in a “nonplanar” manner, which was favorable for the generation of cyclohexanone as a product. In addition, the formation of electron-deficient oxygen defects and low-valent Nb 4+ on the surface of the AP-treated catalysts promoted the adsorption and activation of oxygen-containing functional groups, which enhanced the activity of the phenol HDO reaction.