The effect of temperature on a ceria–alumina–baria–cordierite monolith combination under oxidising and reducing conditions

Angove, Dennys E.; Cant, Noel W.; French, David; Kinealy, K.

doi:10.1016/s0926-860x(99)00350-6

Cited by 13 publications

(8 citation statements)

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“…The formation of CeAlO 3 has also been observed in the washcoat of catalytic converters due to the reaction between CeO 2 and γ-Al 2 O 3 at high-temperature aging in both reducing and oxidizing environments. 25 However, it is also reported that the formation of CeAlO 3 in commercial ceria−baria−alumina on cordierite monolith is thermodynamically favorable in a reducing environment, 26 In this study, RBS spectra were collected from the as-grown, Au-implanted, and Au-implanted and annealed CeO 2 thin film as shown in Figure 4. Arrows in the RBS spectrum for the asgrown CeO 2 film indicate the channel numbers for elements Ce, Al, and O on the surface, which are related to the backscattered energy of each element.…”

Section: ■ Results and Discussionmentioning

confidence: 93%

Selective Plasmonic Gas Sensing: H₂, NO₂, and CO Spectral Discrimination by a Single Au-CeO₂Nanocomposite Film

et al. 2012

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A Au-CeO(2) nanocomposite film has been investigated as a potential sensing element for high-temperature plasmonic sensing of H(2), CO, and NO(2) in an oxygen containing environment. The CeO(2) thin film was deposited by molecular beam epitaxy (MBE), and Au was implanted into the as-grown film at an elevated temperature followed by high temperature annealing to form well-defined Au nanoclusters. The Au-CeO(2) nanocomposite film was characterized by X-ray diffraction (XRD) and Rutherford backscattering spectrometry (RBS). For the gas sensing experiments, separate exposures to varying concentrations of H(2), CO, and NO(2) were performed at a temperature of 500 °C in oxygen backgrounds of 5.0, 10, and ∼21% O(2). Changes in the localized surface plasmon resonance (LSPR) absorption peak were monitored during gas exposures and are believed to be the result of oxidation-reduction processes that fill or create oxygen vacancies in the CeO(2). This process affects the LSPR peak position either by charge exchange with the Au nanoparticles (AuNPs) or by changes in the dielectric constant surrounding the particles. Spectral multivariate analysis was used to gauge the inherent selectivity of the film between the separate analytes. From principal component analysis (PCA), unique and identifiable responses were seen for each of the analytes. Linear discriminant analysis (LDA) was also used and showed separation between analytes as well as trends in gas concentration. Results indicate that the Au-CeO(2) thin film is selective to O(2), H(2), CO, and NO(2) in separate exposures. This, combined with the observed stability over long exposure periods, shows the Au-CeO(2) film has good potential as an optical sensing element for harsh environmental conditions.

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Section: ■ Results and Discussionmentioning

confidence: 93%

Selective Plasmonic Gas Sensing: H₂, NO₂, and CO Spectral Discrimination by a Single Au-CeO₂Nanocomposite Film

et al. 2012

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“…Some perovskites are high temperature superconductors, and others potentially have value as catalysts and catalyst supports − Yet, the phase produced in this work, CeAlO 3 , has only been identified in the catalysis literature, not employed, after it is inadvertently formed when complex oxides are heated for a long period of time at temperatures above 800 °C. − Another identified application of CeAlO 3 is as a stabilizer of other phases against high temperature sintering. It was recently argued that the presence of a very small fractional amount (∼ <10%) of this phase, also created by reducing mixed alumina/ceria nanopowders at an elevated temperature, stabilized the predominant alumina phases against sintering at temperatures as high as 1473 K .…”

Section: Discussionmentioning

confidence: 99%

Production of Complex Cerium−Aluminum Oxides Using an Atmospheric Pressure Plasma Torch

Luhrs

Phillips

Fanson³

2007

Langmuir

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Ceria-alumina particles of a wide variety of structures, from micrometer-sized hollow spheres to nanoparticles, were produced from aerosols of different natures, but all derived from nitrate salts passed through a low power (<1000 W) atmospheric pressure plasma torch. The amount of water present with the nitrate salts was found to significantly affect the morphology of the resulting material. A model was proposed that explains the mechanism in which water acts as a blowing agent to create hollow metal oxide spheres that then shatter to form metal oxide nanoparticles. Further examination of the nanoparticles revealed that they display a core/shell morphology in which the core material is crystalline CeO2 and the shell material is amorphous Al2O3. These unique core/shell materials are interesting candidates for catalyst support materials with high thermal durability. In addition, experiments have shown that the nanoparticles can be readily converted into CeAlO3 perovskite.

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“…Generally, some additives or modifiers are used to prevent or delay the alumina transformations [9][10][11][12][13][14][15][16][17]. These additives include rare earth oxides, alkaline earth oxides, silica and other oxides, among which rare earth oxides are more often used.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ce–Zr mixed oxides on the thermal stability of transition aluminas at elevated temperature

Yang

Weng

2004

Journal of Alloys and Compounds

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The effect of temperature on a ceria–alumina–baria–cordierite monolith combination under oxidising and reducing conditions

Cited by 13 publications

References 13 publications

Selective Plasmonic Gas Sensing: H₂, NO₂, and CO Spectral Discrimination by a Single Au-CeO₂Nanocomposite Film

Selective Plasmonic Gas Sensing: H₂, NO₂, and CO Spectral Discrimination by a Single Au-CeO₂Nanocomposite Film

Production of Complex Cerium−Aluminum Oxides Using an Atmospheric Pressure Plasma Torch

Effect of Ce–Zr mixed oxides on the thermal stability of transition aluminas at elevated temperature

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The effect of temperature on a ceria–alumina–baria–cordierite monolith combination under oxidising and reducing conditions

Cited by 13 publications

References 13 publications

Selective Plasmonic Gas Sensing: H2, NO2, and CO Spectral Discrimination by a Single Au-CeO2Nanocomposite Film

Selective Plasmonic Gas Sensing: H2, NO2, and CO Spectral Discrimination by a Single Au-CeO2Nanocomposite Film

Production of Complex Cerium−Aluminum Oxides Using an Atmospheric Pressure Plasma Torch

Effect of Ce–Zr mixed oxides on the thermal stability of transition aluminas at elevated temperature

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Product

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Selective Plasmonic Gas Sensing: H₂, NO₂, and CO Spectral Discrimination by a Single Au-CeO₂Nanocomposite Film

Selective Plasmonic Gas Sensing: H₂, NO₂, and CO Spectral Discrimination by a Single Au-CeO₂Nanocomposite Film