六方相氮化硼负载铜纳米粒子的制备及其催化还原对硝基苯酚
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摘要
利用一步高温烧结法制备得到稳定的六方相氮化硼(h-BN)负载纳米单质铜复合物Cu/BN,并通过X-射线衍射仪、傅里叶红外光谱仪、紫外-可见漫反射光谱仪以及扫描电子显微镜等仪器对其结构进行表征.另外,将所制备的Cu/BN复合物用于催化还原对硝基苯酚.研究发现,Cu/BN复合物具有良好的稳定性和催化还原对硝基苯酚的性能,利用不同温度下反应速率的线性拟合算出反应的动力学活化能约为110 k J·mol-1.
Stable Cu / BN composites were prepared by dispersing copper nanoparticles on h- BN through one- step high- temperature sintering method. The structural features of the as- obtained composites were characterized by X- ray diffraction,Fourier transform infrared spectroscopy,ultraviolet- visible diffuse reflection spectroscopy and scanning electron microscope. Moreover,the catalytic activities were evaluated by reducing p- nitrophenol into p- aminophenol. It was found that the Cu / BN composites have a good stability in air and keep an excellent activity for the catalytic hydrogenation of p- nitrophenol. The activation energy of this reduction reaction was determined to be about110 k J·mol- 1.
Stable Cu / BN composites were prepared by dispersing copper nanoparticles on h- BN through one- step high- temperature sintering method. The structural features of the as- obtained composites were characterized by X- ray diffraction,Fourier transform infrared spectroscopy,ultraviolet- visible diffuse reflection spectroscopy and scanning electron microscope. Moreover,the catalytic activities were evaluated by reducing p- nitrophenol into p- aminophenol. It was found that the Cu / BN composites have a good stability in air and keep an excellent activity for the catalytic hydrogenation of p- nitrophenol. The activation energy of this reduction reaction was determined to be about110 k J·mol- 1.
引文
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[17]ZHENG M,LIU Y,GU Y,et al.Synthesis and characterization of boron nitride sponges as a novel support for metal nanoparticles[J].Science in China Series B:Chemistry,2008,51(3):205-210.
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