title: Influence of ferric oxide modification on the properties of copper oxide supported on gamma-alumina.
abstract: X-ray diffraction (XRD), Mössbauer spectroscopy, and temperature-programmed reduction (TPR) were employed to investigate the dispersion and reduction behaviors of the Fe(2)O(3)/CuO/gamma-Al(2)O(3) system. The results indicated that: (1) the crystalline CuO particle in the CuO/gamma-Al(2)O(3) samples was redispersed during impregnating CuO/gamma-Al(2)O(3) samples with Fe(NO(3))(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 gamma-Al(2)O(3) 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.
authors.affiliation: Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Wu
authors.forename: Fei
authors.initials: F
authors.lastname: Gao
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Yue
authors.initials: Y
authors.lastname: Dai
authors.forename: Haiyang
authors.initials: H
authors.lastname: Zhu
authors.forename: Binhua
authors.initials: B
authors.lastname: Zhou
authors.forename: Yuhai
authors.initials: Y
authors.lastname: Hu
authors.forename: Lin
authors.initials: L
authors.lastname: Dong
authors.forename: Zheng
authors.initials: Z
authors.lastname: Hu