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Arginine-Assisted Hydrothermal Synthesis of Urchin-like Nb2O5 Nanostructures Composed of Nanowires and Their Application in Cyclohexanone Ammoximation
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-01-18 00:00:00 , DOI: 10.1021/acs.jpcc.7b10312
Yong Wang 1 , Feng Xin 1 , Xiaohong Yin 2 , Yuexiao Song 1 , Tianyu Xiang 1 , Junzheng Wang 1
Affiliation  

Urchin-like Nb2O5 nanostructures have been successfully synthesized by a novel and simple l-arginine-assisted hydrothermal method. They are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), nitrogen adsorption–desorption isotherms, thermogravimetric and differential thermal analysis (TG-DTA), and Fourier transform infrared spectroscopy (FT-IR). The results show that the urchin-like nanostructures are composed of nanowires with diameter less than 15 nm and possess a high specific surface area of 249.9 m2·g–1. Urchin-like Nb2O5 nanostructures have been used for the first time as a novel catalyst instead of conventional titanosilicate in the liquid-phase ammoximation of cyclohexanone. The as-prepared urchin-like Nb2O5 nanostructures exhibit high catalytic activity in cyclohexanone ammoximation. Under the optimal reaction conditions, the conversion of cyclohexanone and selectivity of oxime are as high as 98.0% and 88.9%, respectively. Finally, a possible formation mechanism of urchin-like Nb2O5 nanostructures is proposed.

中文翻译:

精氨酸辅助水热合成纳米线组成的Urchin样Nb 2 O 5纳米结构及其在环己酮氨化反应中的应用

通过新颖和简单的1-精氨酸辅助水热方法成功地合成了Urchin状的Nb 2 O 5纳米结构。它们的特征在于X射线衍射(XRD),扫描电子显微镜(SEM),高分辨率透射电子显微镜(HRTEM),氮吸附-解吸等温线,热重和差热分析(​​TG-DTA)以及傅立叶变换红外光谱(FT-IR)。结果表明,类海胆纳米结构由直径小于15 nm的纳米线组成,具有249.9 m 2 ·g –1的高比表面积。类顽童Nb 2 O 5在环己酮的液相氨肟化反应中,纳米结构首次被用作新型催化剂,而不是常规的钛硅酸盐。制备的海胆样Nb 2 O 5纳米结构在环己酮氨氧化反应中显示出高催化活性。在最佳反应条件下,环己酮的转化率和肟的选择性分别高达98.0%和88.9%。最后,提出了一种可能的海胆状Nb 2 O 5纳米结构的形成机理。
更新日期:2018-01-18
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