Influence of ferric oxide modification on the properties of copper oxide supported on γ-alumina

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• 作者：Yong Wu ; Fei Gao ; Bin Liu ; Yue Dai ; Haiyang Zhu ; Binhua Zhou ; Yuhai Hu ; Lin Dong ; Zheng Hu
• 关键词：Incorporation model ; Mö ; ssbauer spectroscopy ; Fe₂O₃/CuO/γ ; -Al₂O₃ ; NO + CO
• 刊名：Journal of Colloid and Interface Science
• 出版年：2010
• 出版时间：15 March 2010
• 年：2010
• 卷：343
• 期：2
• 页码：522-528
• 全文大小：793 K

文摘

X-ray diffraction (XRD), Mössbauer spectroscopy, and temperature-programmed reduction (TPR) were employed to investigate the dispersion and reduction behaviors of the Fe₂O₃/CuO/γ-Al₂O₃ system. The results indicated that: (1) the crystalline CuO particle in the CuO/γ-Al₂O₃ samples was redispersed during impregnating CuO/γ-Al₂O₃ samples with Fe(NO₃)₃ solutions; (2) two different dispersion states of surface iron species could be observed, i.e., State I corresponding to the iron(III) species located in the D layer on the surface of γ-Al₂O₃ and State II corresponding to those in the C layer. The dispersed states of surface iron(III) species were closely related to the iron loading amount; (3) the copper species located in the D layer of alumina surface was easily reduced and the copper species located in the C layer were more stable, which could be due to the influence of the iron(III) species in the different layers; (4) in the NO + CO reaction, the catalytic performances were enhanced due to the Cu–Fe synergism and the main active species in this system should be the surface-dispersed copper oxide species.