期刊
CHEMISTRY OF MATERIALS
卷 25, 期 16, 页码 3277-3287出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm400192q
关键词
nanosheet; niobic acid; hydrothermal synthesis; Bronsted acid; green chemistry
资金
- National Basic Research Program of China [2013CB933100, 2010CB732303]
- Natural Science Foundation of China [21173172, 21103143, 21161130522, 21033006]
- Program for Changjiang Scholars and Innovative Research Team in Chinese University [IRT1036]
This paper reports a novel bottom-up hydrothermal route for the synthesis of niobic acid nanosheets. This route is simpler and greener than the conventional top-down and multistep route for the synthesis of hydrated metal oxide nanosheets via exfoliation of layered compounds, which typically requires the use of bulky organic cations. We have clarified that the pH of the suspension for hydrothermal treatment, the hydrothermal temperature and time, and the presence of NH4+ play roles in determining the morphology of the product. We propose that the nanosheet is formed from amorphous niobic acid nanoparticles through a dissolution-crystallization mechanism. The obtained niobic acid nanosheets are uniform with a thickness of similar to 2 nm and uniquely possess mainly Bronsted acid sites. As compared to the conventional amorphous niobic acid and several other typical solid acid catalyst's, the niobic acid nanosheet synthesized by our bottom-up method exhibits significantly higher activity and selectivity for the Friedel-Crafts alkylation of anisole with benzyl alcohol. We have further demonstrated that our niobic acid nanosheet is a water-tolerant and efficient catalyst for the hydrolysis of inulin, a polysaccharide-based biomass, into fructose.
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