Citation: Yaxuan Jing, Yu Xin, Yong Guo, Xiaohui Liu, Yanqin Wang. Highly efficient Nb₂O₅ catalyst for aldol condensation of biomass-derived carbonyl molecules to fuel precursors[J]. Chinese Journal of Catalysis, ;2019, 40(8): 1168-1177. doi: S1872-2067(19)63371-1 shu

Highly efficient Nb₂O₅ catalyst for aldol condensation of biomass-derived carbonyl molecules to fuel precursors

Shanghai Key Laboratory of Functional Materials Chemistry, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China

Received Date: 26 February 2019
Revised Date: 6 April 2019

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 21832002, 21872050, and 21808063), the Fundamental Research Funds for the Central Universities (222201718003), the Science and Technology Commission of Shanghai Municipality (18ZR1408500, 10dz2220500), and the "Zhang Jiangshu" Excellent Ph.D. Project of ECUST.

Aldol condensation is of significant importance for the production of fuel precursors from biomass-derived chemicals and has received increasing attention. Here we report a Nb₂O₅ catalyst with excellent activity and stability in the aldol condensation of biomass-derived carbonyl molecules. It is found that in the aldol condensation of furfural with 4-heptanone, Nb₂O₅ has obviously superior activity, which is not only better than that of other common solid acid catalysts (ZrO₂ and Al₂O₃), more importantly, but also better than that of solid base catalysts (MgO, CaO, and magnesium-aluminum hydrotalcite). The detailed characterizations by N₂ sorption/desorption, NH₃-TPD, Py-FTIR and DRIFTS study of acetone adsorption reveal that Nb₂O₅ has a strong ability to activate the C=O bond in carbonyl molecules, which helps to generate a metal enolate intermediate and undergo the nucleophilic addition to form a new C-C bond. Furthermore, the applicability of Nb₂O₅ to aldol condensation is extended to other biomass-derived carbonyl molecules and high yields of target fuel precursors are obtained. Finally, a multifunctional Pd/Nb₂O₅ catalyst is prepared and successfully used in the one-pot synthesis of liquid alkanes from biomass-derived carbonyl molecules by combining the aldol condensation with the sequential hydrodeoxygenation.
- Aldol condensation,
- Nb₂O₅,
- C=O activation,
- Fuel precursor,
- Bio-liquid alkane,
- One-pot process
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Highly efficient Nb₂O₅ catalyst for aldol condensation of biomass-derived carbonyl molecules to fuel precursors