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Reduction of nanostructured CuO bundles: Correlation between microstructure and reduction properties

机译：纳米结构CuO束的还原：微观结构与还原性能之间的相关性

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A high yield of nanostructured CuO bundles with different building blocks is successfully prepared through simple hydrothermal and thermal treatment methods. The microstructure of the as-synthesized samples is characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N-2 physisorption, and IR spectra. The results show that the microstructure of the CuO bundles, such as different grain sizes, BET surface areas, pore sizes, defects and morphologies of building blocks can be obtained by different synthetic methods. Moreover, H-2-TPR and in situ XRD experiments are used to investigate the reduction properties of the nanostructured CuO bundles. It is found that there are two different reduction pathways involved in the reduction processes at 30 mL/min of 10 vol. % H-2/N-2: for the sample synthesized through the hydrothermal method (CuO-HT), all of the CuO is reduced directly to metallic Cu; however, for the sample synthesized through the thermal treatment method (CuO-TT), all of the CuO is reduced to Cu2O intermediate, then to metallic Cu, and the reduction temperature of the CuO-HT sample is much higher than that of the CuO-TT sample. These different reduction properties of the as-synthesized samples should be due to their different grain sizes, defect concentrations, and pore structures.
机译：通过简单的水热处理和热处理方法，成功制备了具有不同结构单元的高产量纳米结构CuO束。合成样品的微观结构通过X射线衍射（XRD），透射电子显微镜（TEM），N-2物理吸附和红外光谱进行表征。结果表明，可以通过不同的合成方法获得CuO束的微观结构，例如不同的晶粒尺寸，BET表面积，孔尺寸，缺陷和构筑物的形态。此外，H-2-TPR和原位XRD实验用于研究纳米结构CuO束的还原性能。发现以10 mL的30 mL / min的速度进行还原过程中存在两种不同的还原途径。 ％H-2 / N-2：对于通过水热法（CuO-HT）合成的样品，所有的CuO都直接还原为金属Cu;然而，对于通过热处理方法（CuO-TT）合成的样品，所有的CuO均被还原为Cu2O中间体，然后还原为金属Cu，并且CuO-HT样品的还原温度远高于CuO的还原温度。 -TT样本。合成样品的这些不同的还原性能应归因于其不同的晶粒尺寸，缺陷浓度和孔结构。

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