期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 200, 期 -, 页码 611-619出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2016.07.051
关键词
Glucose; Fructose; 5-Hydroxymethylfurfural; Mesoporous Nb-W; Isomerization
资金
- National Basic Research Development Program (973 Program) of China [2011CB201403]
- National Natural Science Foundation of China [21403269, 21273264]
- Shanxi Province of China [2016021033]
- Youth Innovation Promotion Association CAS [2015140]
A series of ordered mesoporous NbxW(8-x) oxides with tunable Nb/W ratio were successfully synthesized by evaporation-induced self-assembly method. The mesoporous structure, morphologies, surface chemical state, and acidic properties of these catalysts were fully characterized by low-temperature sorption of N-2, small-angle and wide-angle XRD, TEM, Raman, XPS, and Py-IR. It was shown that the NbxW(8-x) oxides created large amounts of Lewis as well as Brensted acid sites, which promoted the isomerization of glucose to fructose followed its dehydration to 5-hydroxymethylfurfural (HMF). Mannose was also. formed via the epimerization of glucose. Of them, the mesoporous Nb4W4 exhibited the best catalytic activity with a comparatively low Ea about 90.2 kJ/mol and good stability in aqueous medium. The kinetic behavior revealed that Lewis acid sites facilitated to glucose-to-fructose isomerization while Brensted acid sites promoted the dehydration of fructose to form HMF. (C) 2016 Elsevier B.V. All rights reserved.
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