O. M. Zhigalina, O. S. Morozova, D. N. Khmelenin, E. N. Cherkovskiy, A. A. Firsova, V. G. Basu, G. A. Vorobieva
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引用次数: 0
Abstract
Abstract—
The influence of the structure of copper powder particles on the catalytic activity of the CeO2/Cu catalyst was studied using the methods of X-ray diffraction, electron microscopy, electron diffraction, energy dispersive X-ray analysis, as well as temperature-programmed reduction of CO (CO-TPR). Nanocomposites were obtained by mechanochemical synthesis using copper particles differing in size and morphology: micron-sized dendrites and nanoparticles. It was shown that the activity of the catalyst obtained from nanosized copper is two times higher, which is due to the presence of CuxO clusters located on the atomic steps of cerium oxide nanocrystals. This arrangement of clusters apparently prevents blocking of activating centers. Thus, the surface structure of cerium oxide particles formed when using nanosized copper powder is a key factor responsible for the catalytic activity.
摘要 利用 X 射线衍射、电子显微镜、电子衍射、能量色散 X 射线分析以及 CO 的温度编程还原（CO-TPR）等方法研究了铜粉颗粒结构对 CeO2/Cu 催化剂催化活性的影响。利用不同大小和形态的铜颗粒（微米大小的树枝状颗粒和纳米颗粒），通过机械化学合成法获得了纳米复合材料。研究表明，由纳米铜制成的催化剂的活性要高出两倍，这是因为在纳米氧化铈晶体的原子阶上存在 CuxO 簇。团簇的这种排列方式显然可以防止活化中心受阻。因此，使用纳米铜粉形成的氧化铈颗粒的表面结构是催化活性的关键因素。
期刊介绍：
Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.
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