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Aerobic Oxidation of Alcohols Catalyzed by V2O5 Rods Decorated on Graphene Oxide
ChemistrySelect ( IF 1.9 ) Pub Date : 2018-12-04 , DOI: 10.1002/slct.201802811
Nagaraj Anbu 1 , Maniveldoss Beaula Ruby Kamalam 2 , Kunjithapatham Sethuraman 3 , Amarajothi Dhakshinamoorthy 1
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The present work reports the preparation of two different nanocomposites, namely, 5 wt% V2O5 rods supported on graphene oxide (GO) (GV1) and 10 wt% V2O5 rods supported on GO (GV2). These nanocomposites are prepared by mixing V2O5 precursor and GO suspension with the assistance of sonication method as a non conventional source of energy. The structural features of these nanocomposites are characterized by powder X‐ray diffraction (XRD), Fourier transform‐infrared spectroscopy (FT‐IR), Raman, scanning electron microscope (SEM), transmission electron microscope (TEM), atomic force microscope (AFM) and UV‐Visible spectroscopy. These analyses confirm the existence of V2O5 rods decorated on GO sheets. Furthermore, the catalytic activity of these nanocomposites is examined in the aerobic oxidation of benzyl alcohol under mild reaction conditions. The observed catalytic data indicate that the present experimental conditions afford complete conversion of benzyl alcohol with 100% selectivity to benzaldehyde with GV2 as a solid catalyst. On the other hand, this catalyst is also effective to promote secondary alcohol oxidation to its corresponding carbonyl compound, thus demonstrating wide substrate scope. The reusability experiments indicate that the activity is decreased in consecutive recycles in the aerobic oxidation of benzyl alcohol. On the other hand, the process is heterogeneous in nature as evidenced by hot filtration experiment.

中文翻译:

氧化石墨烯修饰的V2O5棒催化乙醇的好氧氧化

目前的工作报告两个不同的纳米复合材料,即,5重量%的V的制备2个ø 5支撑在氧化石墨烯(GO)(GV1)和10重量%的V棒2个ø 5支撑在GO(GV2)棒。这些纳米复合材料是通过将V 2 O 5前驱物和GO悬浮液在超声方法的辅助下混合而制成的,这是一种非常规的能源。这些纳米复合材料的结构特征通过粉末X射线衍射(XRD),傅里叶变换红外光谱(FT-IR),拉曼,扫描电子显微镜(SEM),透射电子显微镜(TEM),原子力显微镜(AFM)来表征)和紫外可见光谱。这些分析证实了V 2的存在O 5杆装饰在GO床单上。此外,在温和的反应条件下,在苄醇的好氧氧化中检查了这些纳米复合材料的催化活性。观察到的催化数据表明,当前的实验条件提供了以GV2为固体催化剂将苄醇完全转化为苯甲醛的选择性为100%。另一方面,该催化剂也有效地促进仲醇氧化成其相应的羰基化合物,因此证明了较宽的底物范围。可重用性实验表明,在苯甲醇的好氧氧化的连续循环中,活性降低。另一方面,通过热过滤实验证明,该方法本质上是异质的。
更新日期:2018-12-04
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