Redox Behavior of Y0.05Ce0.1Zr0.85O2 and Y0.1Ce0.1Zr0.8O2 System Catalysts Doped with Copper(II)

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• 作者：S. P. Kulyova ; E. V. Lunina ; V. V. Lunin ; B. G. Kostyuk ; G. P. Muravyova ; A. N. Kharlanov ; E. A. Zhilinskaya ; and A. Aboukaï ; s
• 刊名：Chemistry of Materials
• 出版年：2001
• 出版时间：May 2001
• 年：2001
• 卷：13
• 期：5
• 页码：1491 - 1496
• 全文大小：79K
• 年卷期：v.13,no.5(May 2001)
• ISSN：1520-5002

文摘

The redox behavior of Y_0.05Ce_0.1Zr_0.85O₂ and Y_0.1Ce_0.1Zr_0.8O₂ doped with copper(II) wasstudied by means of diffuse reflectance electronic spectra (DRES), temperature-programmedreduction (TPR), and electron paramagnetic resonance (EPR) techniques. In the absence ofcopper, it has been demonstrated that the solid is more reducible while it contains moreyttrium. The addition of copper in the form of isolated or clusters/small particles makes thereduction of Ce⁴⁺ ions present on the solid surface and in the bulk easier. Nevertheless,three types of Cu²⁺ ions were evidenced in the solids: isolated and cluster species in strongdipolar interaction with octahedral symmetries and tetragonal distortion surrounded by morethan six ligands, aggregates of CuO located on the solid surface, and finally isolated Cu²⁺ions located in the solid bulk with octahedral symmetries and strong distortions and whichremain silent toward reduction by CO.