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首页> 外文期刊>Chemistry: A European journal >Zeolite-supported gold nanoparticles for selective photooxidation of aromatic alcohols under visible-light irradiation
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Zeolite-supported gold nanoparticles for selective photooxidation of aromatic alcohols under visible-light irradiation

机译：沸石负载的金纳米颗粒在可见光照射下用于芳香醇的选择性光氧化

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With new photocatalysts of gold nanoparticles supported on zeolite supports (Au/zeolite), oxidation of benzyl alcohol and its derivatives into the corresponding aldehydes can proceed well with a high selectivity (99 %) under visible-light irradiation at ambient temperature. Au/zeolite photocatalysts were characterised by UV/Vis, X-ray photoelectron spectroscopy (XPS), TEM, XRD, energy-dispersive spectroscopy (EDS), Brauner-Emmet-Teller (BET) analyses, IR and Raman techniques. The surface plasmon resonance (SPR) effect of gold nanoparticles, the adsorption capability of zeolite supports and the molecular polarities of aromatic alcohols were demonstrated to have an essential correlation with the photocatalytic performances. In addition, the effects of light intensity, wavelength range and the role of molecular oxygen were investigated in detail. The kinetic study indicated that the visible-light irradiation required much less apparent activation energy for photooxidation compared with thermal reaction. Based on the characterisation data and the photocatalytic performances, we proposed a possible photooxidation mechanism.
机译：使用负载在沸石载体（Au /沸石）上的金纳米颗粒的新型光催化剂，在环境温度下可见光照射下，苯甲醇及其衍生物氧化为相应的醛的反应选择性很高（99％）。通过紫外/可见光，X射线光电子能谱（XPS），TEM，XRD，能谱分析（EDS），Brauner-Emmet-Teller（BET）分析，IR和拉曼技术对Au /沸石光催化剂进行了表征。金纳米粒子的表面等离振子共振（SPR）效应，沸石载体的吸附能力和芳香醇的分子极性被证明与光催化性能有本质的关系。此外，还详细研究了光强度，波长范围和分子氧的作用。动力学研究表明，与热反应相比，可见光辐射所需的表观活化能要低得多。根据表征数据和光催化性能，我们提出了一种可能的光氧化机理。

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