Journal
FUEL
Volume 324, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.124400
Keywords
Crystal phase; Oxygen vacancy; Aqueous phase; Hydrodeoxygenation; Synergistic effect
Categories
Funding
- National Natural Science Foundation of China [22108056]
- Scientific Research Projects of Hebei Education Department [QN2019050]
- Natural Science Foundation of Hebei Province [B2020202004]
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Hydrodeoxygenation in aqueous phase is a green and efficient approach for converting biomass and its derivatives into high value-added chemicals and renewable fuels. In this study, Ni/T-Nb2O5 catalyst with the highest concentration of oxygen vacancies (Ov) exhibited excellent hydrodeoxygenation performance. The synergistic effect between Ov and water promoted the hydrodeoxygenation of vanillin in aqueous phase, achieving a high yield of 2-methoxy-4-methylphenol (MMP).
Hydrodeoxygenation (HDO) in aqueous phase is green and efficient approaches to convert the biomass and its derivative to high value-added chemicals and renewable fuels. However, it remains a great challenge for synthesizing catalysts with the excellent hydrodeoxygenation performance. Three kinds of Ni/Nb2O5 catalyst with different crystal structures (Ni/TT-Nb2O5, Ni/T-Nb2O5, Ni/H-Nb2O5) were prepared for vanillin hydrodeoxygenation. Compared with the Ni/TT-Nb2O5 and Ni/H-Nb2O5 catalyst, the Ni/T-Nb2O5 catalyst had the most concentration of oxygen vacancies (O-v), which resulted in the excellent hydrodeoxygenation performance. At 180 degrees C, 1 MPa H-2, and the water/ethanol ratio of 8/12, 96.1% conversion of vanillin and 79.2% selectivity of 2-methoxy-4-methylphenol (MMP) were obtained. The abundant Ov of Ni/T-Nb2O5 adsorbed and activated the C-OH bonds of vanillyl alcohol (VA), while water formed a stronger transition state with VA to further reduce the disassociation energy of C-OH bonds. The synergistic effect between O-v and water promoted the hydrodeoxygenation of vanillin in aqueous phase, achieving the high yield of MMP. This work provides a new idea for the preparation of catalysts with high catalytic performance in aqueous phase.
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