Rational design of oligomeric MoO3 in SnO2 lattices for selective hydrodeoxygenation of lignin derivatives into monophenols

Authors：Diao, Xinyong; Ji, Na^*; Li, Tingting; Jia, Zhichao; Jiang, Sinan; Wang, Zhenjiao; Song, Chunfeng; Liu, Caixia; Lu, Xuebin; Liu, Qingling

Source：Journal of Catalysis, 2021, 401: 234-251.

DOI：10.1016/j.jcat.2021.07.029

• Mo-Sn bimetallic
• oligomeric MoO3
• Demethoxylation
• Monophenols
• Mechanism

Novel Mo-Sn bimetallic oxide catalysts with highly dispersed oligomeric MoO3 in SnO2 lattices, which were synthesized by the co-precipitation method and pretreated by anhydrous ethanol, were first employed in the hydrodeoxygenation of various lignin derivatives to produce monophenols with high activity and selectivity. In comparison with the pure alpha-MoO3 and the previous reported catalysts, the alpha-2Mo1Sn exhibited superior activity in the hydrodeoxygenation of guaiacol, with full conversion and 92.5% phenol yield at 300 degrees C under 4 MPa initial H-2 pressure in n-hexane for 4 h. According to compre-hensive characterizations and catalytic measurements, the excellent performance of alpha-2Mo1Sn was ascribed to the formation of abundant Sn-O-Mo-O-V interfacial sites, which possessed strong Mo-Sn inter-action with enhanced surface area, electron-donating group binding ability, Lewis acidity, and redox abil-ity. It was demonstrated that over the present alpha-2Mo1Sn catalyst system, the Sn-O-Mo-O-V interfacial sites could greatly facilitate the adsorption and activation of C-aromatic-OCH3 and C-aromatic-CH3 bonds, and thus significantly promote the demethoxylation and demethylation reaction to produce phenol. This work figures out the rational design of MoO3-based catalyst and displays a clear potential for the selective hydrodeoxygenation of lignin derivatives into monophenols.

• Institution
  天津大学