Use of CeO2-based oxides in the three-way catalysis

Kašpar, Jan; Fornasiero, Paolo; Graziani, M.

doi:10.1016/s0920-5861(98)00510-0

Cited by 1,666 publications

(1,054 citation statements)

References 91 publications

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“…34 The positive effect of ceria doping has been also reported for ceria-catalyzed diesel soot combustion 35,36 or NOx storage and Reduction (NSR) on Pt/Ceria catalysts, 37 for instance, where the redox properties of ceria play an important role.…”

Section: Comparing Co-prox With Other Catalytic Reactionsmentioning

confidence: 88%

Role of Hydroxyl Groups in the Preferential Oxidation of CO over Copper Oxide–Cerium Oxide Catalysts

et al. 2016

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Model CuO/Ce 0.8 X 0.2 O δ catalysts (with X = Ce, Zr, La, Pr, or Nd) have been prepared in order to obtain CuO/ceria materials with different chemical features and have been characterized by X-ray diffraction, Raman spectroscopy, N 2 adsorption, and H 2 temperature-programmed reduction. CO-PROX experiments have been performed in a fixed-bed reactor and in an operando DRIFTS cell coupled to a mass spectrometer. The CO oxidation rate over CuO/ceria catalysts correlates with the formation of the Cu + −CO carbonyl above a critical temperature (90 °C for the experimental conditions in this study) because copper−carbonyl formation is the rate-limiting step. Above this temperature, CO oxidation capacity depends on the redox properties of the catalyst. However, decomposition of adsorbed intermediates is the slowest step below this threshold temperature. The hydroxyl groups on the catalyst surface play a key role in determining the nature of the carbon-based intermediates formed upon CO chemisorption and oxidation. Hydroxyls favor the formation of bicarbonates with respect to carbonates, and catalysts forming more bicarbonates produce faster CO oxidation rates than those which favor carbonates.

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Section: Comparing Co-prox With Other Catalytic Reactionsmentioning

confidence: 88%

Role of Hydroxyl Groups in the Preferential Oxidation of CO over Copper Oxide–Cerium Oxide Catalysts

et al. 2016

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“…In recent years, CeONP and CeONP-containing materials have come under intense scrutiny as catalysts and as structural and electronic promoters of heterogeneous catalytic reactions. 6 In industry, it has been most widely used as an active component in processes such as three-way catalysts 7 for automobile exhaust-gas treatments, oxidative coupling of methane and water-gas shift reaction. Recently, CeONP has been reported to have multienzyme, including superoxide oxidase, catalase and oxidase, mimetic properties, and has emerged as a fascinating and lucrative material in biological fields such as in bioanalysis, [10][11][12][13][14][15] biomedicine, 9 drug delivery 16,17 and bioscaffolding.…”

Section: Introductionmentioning

confidence: 99%

Cerium oxide nanoparticle: a remarkably versatile rare earth nanomaterial for biological applications

2014

NPG Asia Mater

846

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“…Cerium oxide (CeO 2 ) is a technologically important material, with applications ranging from catalysis in automotive exhaust [1][2][3][4][5], solid-oxide fuel cells [6,7], and water-gas shift reactions [8,9]. The outstanding functionality of CeO 2 in these applications is largely due to its great oxygen storage/release capability (OSC).…”

Section: Introductionmentioning

confidence: 99%

Disentangling the role of small polarons and oxygen vacancies in CeO2

et al. 2017

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The outstanding performance of cerium oxide (CeO 2 ) as ion conductor or catalyst strongly depends on the ease of Ce 4+ ↔Ce 3+ conversion and oxygen vacancyformation. An accurate description of Ce 3+ and oxygen vacancy is therefore essential to further progress in this area. Using the HSE06 hybrid functional, we investigate the formation and migration of small polarons (Ce 3+ ) and their interaction with oxygen vacancies in CeO 2 , considering the small polaron and vacancy as independent entities.Oxygen vacancies are double donors and can bind up to two small polarons, forming a positively charged or neutral complex. We compute the electron self-trapping energy (i.e., energy gain when forming a small polaron), the small-polaron migration barrier, vacancy formation and migration energies, and vacancy-polaron binding energies. We find that small polarons weakly bind to oxygen vacancies, yet this interaction significantly contributes to the activation energy for hopping electronic conductivity.The results are compared with previous calculations and discussed in the light of available experimental data.

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Use of CeO2-based oxides in the three-way catalysis

Cited by 1,666 publications

References 91 publications

Role of Hydroxyl Groups in the Preferential Oxidation of CO over Copper Oxide–Cerium Oxide Catalysts

Role of Hydroxyl Groups in the Preferential Oxidation of CO over Copper Oxide–Cerium Oxide Catalysts

Cerium oxide nanoparticle: a remarkably versatile rare earth nanomaterial for biological applications

Disentangling the role of small polarons and oxygen vacancies in CeO2

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