Lattice-water-induced acid sites in tungsten oxide hydrate for catalyzing fructose dehydration

Herein, hydrated WO3 was synthesized by hydrothermal method, and the relationship between its structure and acidity was explored. The numbers of Brønsted acid sites (BAS) and Lewis acid sites (LAS) can be modulated by adjusting the lattice water content of WO3·nH2O. Mechanism studies shown that the...

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Veröffentlicht in:Catalysis communications 2021-01, Vol.149, p.106254, Article 106254
Hauptverfasser: Sun, Haolin, Song, Fei, Zhou, Chunmei, Wan, Xiaoyue, Jin, Yuguang, Dai, Yihu, Zheng, Jianwei, Yao, Siyu, Yang, Yanhui
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Sprache:eng
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Zusammenfassung:Herein, hydrated WO3 was synthesized by hydrothermal method, and the relationship between its structure and acidity was explored. The numbers of Brønsted acid sites (BAS) and Lewis acid sites (LAS) can be modulated by adjusting the lattice water content of WO3·nH2O. Mechanism studies shown that the density of BAS and diffusion effect have a synergistic effect on the activity of dehydration reaction. The optimized WO3·0.5H2O catalyst in the presence of both high BAS density and high BAS accessibility afforded 73% 5-hydroxymethylfurfural (HMF) yield, and almost no deactivation appeared after five cycles. Nearly twice higher turnover frequency (TOF) and 50% higher HMF selectivity were observed in comparison to anhydrous WO3. [Display omitted] •Lattice water was introduced to WO3 to afford acid sites for fructose dehydration.•The formation mechanism of Lewis and Bronsted acid sites induced by lattice water was investigated.•The relationship between lattice water, acid site and catalyst activity was established.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2020.106254