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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Structural Characterization and Catalytic Activity of Ce_(0.65)Zr_(0.25)RE_(0.1)O_(2-δ) Nanocrystalline Powders Synthesized by the Glycine-Nitrate Process
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Structural Characterization and Catalytic Activity of Ce_(0.65)Zr_(0.25)RE_(0.1)O_(2-δ) Nanocrystalline Powders Synthesized by the Glycine-Nitrate Process

机译：甘氨酸-硝酸盐法合成Ce_（0.65）Zr_（0.25）RE_（0.1）O_（2-δ）纳米晶粉的结构表征和催化活性

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In this study, Ce_(0.65)Zr_(0.25)RE_(0.1)O_(2-δ) (RE = Tb, Gd, Eu, Sm, Nd, Pr, and La) solid solutions were successfully prepared by the glycine-nitrate process and tested for CO oxidation activity. The X-ray diffraction results confirmed the formation of complete Ce_(0.65)Zr_(0.25)RE_(0.1)O_(2-δ) solid solutions. The Raman spectroscopy measurements suggested the presence of oxygen vacancies due to defective structure formation and further evidenced the formation of solid solution. The high-resolution transmission electron microscopy observations showed the nanocrystalline nature of the solid solutions. From X-ray photoelectron spectroscopy analysis it was revealed that the cerium, terbium, and praseodymium are present in -i-3 and +4 oxidation states. The UV-vis diffuse reflectance spectroscopy indicated that the Pr~(3+) ions in the Ce_(0.65)Zr_(0.25)RE_(0.1)O_(2-δ) system provoked a significant increase in the Ce~(3+) fraction on the surface. H2 temperature-programmed reduction measurements showed an enhanced surface reduction at much lower temperatures for Ce_(0.65)Zr_(0.25)RE_(0.1)O_(2-δ) sample compared to others, indicating increased oxygen mobility in these samples, which enable the enhanced oxygen diffusion at lower temperatures. Significantly high CO oxidation activity is exhibited by Ce_(0.65)Zr_(0.25)RE_(0.1)O_(2-δ) solid solution.
机译：在这项研究中，成功​​地通过硝酸甘氨酸制备了Ce_（0.65）Zr_（0.25）RE_（0.1）O_（2-δ）（RE = Tb，Gd，Eu，Sm，Nd，Pr和La）固溶体工艺并测试了CO的氧化活性。 X射线衍射结果证实了完整的Ce_（0.65）Zr_（0.25）RE_（0.1）O_（2-δ）固溶体的形成。拉曼光谱测量表明由于结构缺陷形成而存在氧空位，并进一步证明了固溶体的形成。高分辨率透射电子显微镜观察显示了固溶体的纳米晶体性质。从X射线光电子能谱分析发现，铈，ter和以-i-3和+4氧化态存在。紫外可见漫反射光谱表明，Ce_（0.65）Zr_（0.25）RE_（0.1）O_（2-δ）体系中的Pr〜（3+）离子引起Ce〜（3+）的显着增加。表面上的分数。 H2程序升温还原测量显示，与其他样品相比，Ce_（0.65）Zr_（0.25）RE_（0.1）O_（2-δ）样品在更低的温度下表面还原性增强，表明这些样品中的氧迁移率增加，这使得在较低温度下增强了氧气的扩散。 Ce_（0.65）Zr_（0.25）RE_（0.1）O_（2-δ）固溶体表现出很高的CO氧化活性。

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