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- Title
Ru<sub>0.05</sub>Ce<sub>0.95</sub>O<sub>2</sub> Solid Solution Derived Ru Catalyst Enables Selective Hydrodeoxygenation of m‐Cresol to Toluene.
- Authors
Fu, Desen; Wu, Xiaoxia; Cui, Beilei; Guo, Yonghua; Wang, Hua; Han, Jinyu; Ge, Qingfeng; Zhu, Xinli
- Abstract
Selective hydrodeoxygenation (HDO) of biomass lignin‐derived phenolic compounds to aromatics is a demanding reaction. Oxophilic Ru based catalysts can catalyze direct deoxygenation but suffer from competing C−C hydrogenolysis to CH4 at 350 °C and hydrogenation of phenyl ring at 250 °C under atmospheric pressure. In this work, a solid solution Ru0.05Ce0.95O2 catalyst was hydrothermally synthesized, characterized and tested for HDO of m‐cresol. The Ru species is highly dispersed in the solid solution as isolated atoms and/or subnanometer clusters as a result of strong Ru−O−Ce interaction, and the catalyst shows high concentration of oxygen vacancies. In contrast to nonselective Ru/SiO2, Ru0.05Ce0.95O2 selectively catalyzes deoxygenation to toluene while significantly inhibits C−C hydrogenolysis and hydrogenation. Moreover, the overall intrinsic HDO rate on Ru0.05Ce0.95O2 is 2.2 and 8.8 times higher than those on Ru/CeO2 and Ru/SiO2, respectively. The Ru−OV−Ce sites were proposed to be the active sites for deoxygenation. Inhibition of C−C hydrogenolysis and phenyl hydrogenation can be ascribed to the reduced size of the Ru ensembles due to the strong interaction in the solid solution.
- Subjects
SOLID solutions; RUTHENIUM catalysts; TOLUENE; BASE catalysts; HYDROGENOLYSIS; ATMOSPHERIC pressure
- Publication
ChemCatChem, 2021, Vol 13, Issue 22, p4814
- ISSN
1867-3880
- Publication type
Article
- DOI
10.1002/cctc.202101239