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首页> 外文期刊>Catalysis science & technology >Plasmon-assisted facile selective gaseous isopropanol dehydrogenation over Ag nanocubes
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Plasmon-assisted facile selective gaseous isopropanol dehydrogenation over Ag nanocubes

机译：等离子体辅助的易于选择性气态异丙醇脱氢在Ag纳米管上

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摘要

In the current research, monodisperse Ag nanocubes are synthesized and characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), field-emission transmittance electron microscopy (FE-TEM), X-ray photoelectron spectroscopy (XPS), and UV-vis photospectrometry. It is seen that isopropanol can be dehydrogenated to acetone over Ag nanocubes in high selectivity at near-room temperatures. Light illumination leads to an increase in the isopropanol dehydrogenation efficiency without decreasing the selectivity. The effects of reaction temperatures, light wavelengths, light intensities, and sizes of the Ag nanocubes on the catalytic yields are investigated in detail. The result reveals that plasmonic heating has a low contribution to the light-induced increase of the catalytic activity, which could be ascribed to a plasmonic non-thermal effect. It is seen that the dehydrogenation activity is dependent on α-hydrogen activation. As compared to methanol, ethanol, and N-propanol, isopropanol presents the highest light-induced catalytic activity because of the most active α-hydrogens. It is considered that the hot electron transfer from the Ag nanocubes to molecular O2 accelerates oxygen activation for isopropanol dehydrogenation.
机译：在当前的研究中，单分散性Ag纳米管由X射线衍射（XRD），田间发射扫描电子显微镜（FE-SEM），田间发射传输电子显微镜（FE-TEM），X射线光电学光谱传播合成并表征（XPS）和UV-VIS照片光谱法。可以看出，在近室温度下，异丙醇可以在高选择性的高选择性下将丙酮脱氢。光照明导致异丙醇脱氢效率的提高而不降低选择性。详细研究了反应温度，光波长，光强度和大小的Ag纳米管对催化产率的影响。结果表明，等离激元加热对光诱导的催化活性的增加的贡献较低，这可以归因于等离激元的非热效应。可以看出，脱氢活性取决于α-氢活化。与甲醇，乙醇和N-丙醇相比，异丙醇具有最高的光诱导活性，这是由于最活跃的α-水蛋白。人们认为，热电子从Ag纳米管转移到分子O2会加速异丙醇脱氢作用的氧气活化。

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