Niobium pentoxide nanomaterials with distorted structures as efficient acid catalysts
Niobium pentoxide nanomaterials with distorted structures as efficient acid catalysts
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DOI：
10.1038/s42004-019-0231-3
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发表时间：
2019-11
影响因子：
5.9
通讯作者：
Kai Skrodczky;Margarida M. Antunes;Xianying Han;S. Santangelo;G. Scholz;A. Valente;N. Pinna;P. Russo
中科院分区：
文献类型：
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作者：
Kai Skrodczky;Margarida M. Antunes;Xianying Han;S. Santangelo;G. Scholz;A. Valente;N. Pinna;P. Russo
五氧化二铌是一种很有前途的生物质转化为燃料和化学品的酸性催化剂。开发新的合成路线对于设计具有改进的活性的五氧化二铌催化剂对于特定的实际过程是至关重要的。在这里，我们展示了一种苯乙酮的合成方法，该方法可以产生具有不同结构和酸度的纳米结构五氧化二铌，这些结构和酸度可以作为有效的酸催化剂。氧化物具有正交结构，具有不同程度的扭曲和配位不饱和金属原子。一个强大的依赖性之间观察到的类型和强度的酸性网站和特定的结构基序。超小的五氧化二铌纳米粒子具有很强的布朗斯特酸性和刘易斯酸性，产物产率为96%。（3小时，140 °C，100%转化率），85%（3小时，140 °C，86%转化率）和100%转化率（3 h，110 °C，100%转化率）的反应。
Niobium pentoxides are promising acid catalysts for the conversion of biomass into fuels and chemicals. Developing new synthesis routes is essential for designing niobium pentoxide catalysts with improved activity for specific practical processes. Here we show a synthesis approach in acetophenone, which produces nanostructured niobium pentoxides with varying structure and acidity that act as efficient acid catalysts. The oxides have orthorhombic structures with different extents of distortions and coordinatively unsaturated metal atoms. A strong dependence is observed between the type and strength of the acid sites and specific structural motifs. Ultrasmall niobium pentoxide nanoparticles, which have strong Brønsted acidity, as well as Lewis acidity, give product yields of 96% (3 h, 140 °C, 100% conversion), 85% (3 h, 140 °C, 86% conversion), and 100% (3 h, 110 °C, 100% conversion) in the reactions of furfuryl alcohol, 5-(hydroxymethyl)furfural, and α-angelica lactone with ethanol, respectively.