Citation:
D. Delgado, A. Fernández-Arroyo, N. La Salvia, M. E. Domine, Jose M. López Nieto. Reflux-synthesized bulk and diluted W-Nb-O mixed oxide bronzes for the valorization of short-chain oxygenates aqueous mixtures[J]. Chinese Journal of Catalysis,
;2019, 40(11): 1778-1787.
doi:
S1872-2067(19)63419-4
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This work reports the preparation of bulk and KIT-6-diluted W-Nb-O mixed oxide bronzes by a reflux method. The influence of the incorporation of Nb and a mesoporous silica on the physico-chemical features of the catalysts is studied. The addition of Nb favors the formation of single-phase oxide bronze structure, with improved Lewis acidity; while the incorporation of KIT-6 gives rise to well-dispersed mixed metal oxide particles on the diluter. These diluted W-Nb-O catalysts present enhanced surface areas and mesopore volumes. The materials have been tested in the valorization of an aqueous model mixture (acetol/propanal/ethanol/acetic acid/water weight ratio of 5/25/10/30/30), through C-C bond formation reactions. The increase in the Lewis nature of surface acid sites stands as the key point to maximize the total organic yield during the reaction (C5-C10 products). The best catalysts maintain their catalytic behavior after five consecutive uses.
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Keywords:
- KIT-6,
- W-Nb-O oxides,
- Aqueous oxygenates,
- Biomass feedstocks,
- C-C bond formation
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