Photoemission on 3d core levels of Cerium: An experimental and theoretical investigation of the reduction of cerium dioxide

Normand, F. Le; Fallah, Jaâfar El; Hilaire, L.; Légaré, P.; Kotani, Akio; Parlebas, J.C.

doi:10.1016/0038-1098(89)90555-3

Cited by 143 publications

(72 citation statements)

References 11 publications

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“…As widely reported in literature [21][22][23], both Ce 3d 5/2 and Ce 3d 3/2 levels present five component v o , v, v 0 , v@, v@ 0 and u o , u, u 0 , u@, u@ 0 , respectively (see Fig. 3).…”

Section: Resultsmentioning

confidence: 76%

Catalytic Performance of Ce1−x Ni x O2 Catalysts for Propane Oxidative Steam Reforming

et al. 2007

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“…As widely reported in literature [21][22][23], both Ce 3d 5/2 and Ce 3d 3/2 levels present five component v o , v, v 0 , v@, v@ 0 and u o , u, u 0 , u@, u@ 0 , respectively (see Fig. 3).…”

Section: Resultsmentioning

confidence: 76%

Catalytic Performance of Ce1−x Ni x O2 Catalysts for Propane Oxidative Steam Reforming

et al. 2007

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“…We have shown here that surface reduction took place at temperatures just above 150°C. This was in contrast with the 99.9% pure microcrystalline CeO, , 15 which showed no surface reduction at temperatures below 700°C. On the other hand, our results were in greater agreement with the work of Laachir et a1.,I6 who reported a surface reduction of 99.5% pure CeO, after room-pressure treatment under H, for 4 h at -400°C.…”

Section: Target Factor Analysismentioning

confidence: 74%

XPS investigation of surface oxidation and reduction in nanocrystalline Ce_xLa_{1 − x}O_{2 − y}

Trudeau

Tschöpe

Ying

1995

Surface & Interface Analysis

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Inert gas condensation was used to generate nanocrystalline Ladoped CeO, -=. Non-stoichiometric CeO,-x-based materials were found to be excellent catalysts in recent studies for the selective reduction of SO,. To understand better the stoichiometry-related catalytic properties, the surface chemistry of nanocrystalline La-doped CeO, -= was investigated through in situ oxidatiowreduction thermal treatments. Oxidation in CO, and reduction in H, atmospheres were performed between 30 O C and 600 O C in a reaction chamber connected to an x-ray photoelectron spectrometer analytical chamber. Curve fitting and target factor analysis were used to obtain a semiquantitative measurement of the transformation between + 3 and +4 oxidation states during these reactions. Target factor analysis was found to be a very useful tool for analyzing the contributions corresponding to Ce+3 and Ce".

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“…The series of u structures from the 3d 3/2 level can be explained in the same way. The v 0 and v' peaks correspond to the 3d 9 4 f 2 (O 2 5 ) and 3d 9 4 f 1 (O 2p 6 ) Ce 3+ final states, respectively 18 . The peak at approximately 916.5 eV is used to identify the existence of Ce 4+ , since it is assigned to 4f 0 transitions, which do not occur for Ce 3+ 16,17 .…”

Section: Xps Analysismentioning

confidence: 99%

The Effect of Co and Zn Addition on Densification and Electrical Properties of Ceria-Based Nanopowders

et al. 2016

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In this work, cobalt and zinc-doped Ce 0.8 Gd 0.2 O 1.9 samples were prepared starting from a commercial nanopowder and compared to the undoped material. The powder samples were pressed and afterwards sintered by a two-step procedure, before characterization by X-Ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Impedance Spectroscopy (IS) in air. Cobalt or zinc additions are effective as sintering aid, allowing peak sintering temperatures around 1000°C to reach densifications above of 93% of theoretical density, showing no evidence for the presence of secondary phases. The total conductivity at 800 °C of pressed Zn-doped samples (6.7x10 -2 S/cm) and Co-doped samples (7.5x10 -2 S/cm) is similar for undoped samples (7.2x10 -2 S/cm) showing that Zn and Co has a positive effect on densification without compromising the electrical conductivity.

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Photoemission on 3d core levels of Cerium: An experimental and theoretical investigation of the reduction of cerium dioxide

Cited by 143 publications

References 11 publications

Catalytic Performance of Ce1−x Ni x O2 Catalysts for Propane Oxidative Steam Reforming

Catalytic Performance of Ce1−x Ni x O2 Catalysts for Propane Oxidative Steam Reforming

XPS investigation of surface oxidation and reduction in nanocrystalline Ce_xLa_{1 − x}O_{2 − y}

The Effect of Co and Zn Addition on Densification and Electrical Properties of Ceria-Based Nanopowders

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Photoemission on 3d core levels of Cerium: An experimental and theoretical investigation of the reduction of cerium dioxide

Cited by 143 publications

References 11 publications

Catalytic Performance of Ce1−x Ni x O2 Catalysts for Propane Oxidative Steam Reforming

Catalytic Performance of Ce1−x Ni x O2 Catalysts for Propane Oxidative Steam Reforming

XPS investigation of surface oxidation and reduction in nanocrystalline CexLa1 − xO2 − y

The Effect of Co and Zn Addition on Densification and Electrical Properties of Ceria-Based Nanopowders

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XPS investigation of surface oxidation and reduction in nanocrystalline Ce_xLa_{1 − x}O_{2 − y}