Surface-structure sensitivity of CO oxidation over polycrystalline ceria powders

Aneggi, Eleonora; Llorca, Jordi; Boaro, Marta; Trovarelli, Alessandro

doi:10.1016/j.jcat.2005.06.008

Cited by 262 publications

(227 citation statements)

References 28 publications

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“…These results suggest that the surface defects might be responsible for the strong interactions of CuO x and CeO 2 and result in the improved lowtemperature reducibility and catalytic activity. Severalr eaction mechanisms have been proposed to understand the CO oxidation on CeO 2 -supported metal catalysts, including the Langmuir-Hinshelwood mechanism, [32] Marsvan Krevelen mechanism, [33] and Eley-Rideal mechanism. [34,35] These mechanisms all point out the importance of oxygen vacancies and surfaced efects on the CeO 2 support.F or example, for the Langmuir-Hinshelwood mechanism, [32] CO is adsorbed on the metal/metal oxide catalyst, oxygen is adsorbed on the CeO 2 support, and the reaction takes place at the perimeter at the catalyst/support interface.…”

Section: Tem Analysismentioning

confidence: 99%

Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts

et al. 2017

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Understanding the correlation of thermal treatment with catalyst activity provides mechanistic information about how the catalysts can be activated or deactivated. In this paper, we report that a comparative study was conducted on CeO2 nanorod‐supported CuOx catalysts before and after reduction treatment to gain insight on the effects of the copper oxidation state and catalyst–support interfacial interactions on CO oxidation. X‐ray diffraction, Raman spectroscopy, hydrogen temperature‐programmed reduction (H2‐TPR), and transmission electron microscopy (TEM) were used in a comprehensive way to study the effects of CuOx (0≤x≤1) composition as well as their spatial distribution on CeO2 nanorods on the H2 consumption and CO oxidation of the catalysts. These techniques were then used to gain a better understanding of the correlation between the different copper species (α, β, and γ‐type CuOx) and the multiple reduction (H2 consumption) peaks, found in the H2‐TPR data during the first run and during in situ reduction and redox cycling experiments. Also concluded from this study is that an abundance of surface defects are found on CeO2 nanorods from high‐resolution TEM, which consequently may be critical to strong CuOx(0≤x≤1)–CeO2−x(0≤x≤0.5) interactions, therefore resulting in the improved low‐temperature catalytic activity.

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Section: Tem Analysismentioning

confidence: 99%

Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts

et al. 2017

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“…[6][7][8][9][10][11][12][13][14][15][16][17] The reactivity of ceria in oxidation reactions, include CO oxidation [18][19][20] and NO X reduction [21][22][23][24][25] is intertwined with the release and uptake of oxygen. Doping of ceria with other metal cations, such as Zr, La, Pd, Ti and Cu has been widely studied [26][27][28][29][30][31][32][33][34][35][36][37][38] to enhance reactivity in oxidation reactions.…”

Section: Q2mentioning

confidence: 99%

On the interaction of Mg with the (111) and (110) surfaces of ceria

Nolan

Lykhach

Tsud

et al. 2012

Phys. Chem. Chem. Phys.

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Access to the full text of the published version may require a subscription. Please note that, in the typefaces we use, an italic vee looks like this: n, and a Greek nu looks like this: n. RightsWe will publish articles on the web as soon as possible after receiving your corrections; no late corrections will be made.Please return your final corrections, where possible within 48 hours of receipt, by e-mail to: pccp@rsc.org.Reprints-Electronic (PDF) reprints will be provided free of charge to the corresponding author. The catalytic activity of cerium dioxide can be modified by deposition of alkaline earth oxide layers or nanoparticles or by substitutional doping of metal cations at the Ce site in ceria. In order to understand the effect of Mg oxide deposition and doping, a combination of experiment and first principles simulations is a powerful tool. In this paper, we examine the interaction of Mg with the ceria (111) surface using both angle resolved X-ray (ARXPS) and resonant (RPES) photoelectron spectroscopy measurements and density functional theory (DFT) corrected for onsite Coulomb interactions (DFT + U). With DFT + U, we also examine the interaction of Mg with the ceria (110) (111) surface. The combined results provide a basis for deeper insights into the catalytic behaviour of ceria-based mixed oxide catalysts.

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“…[1][2][3] Its unique properties can be explained by its ability to rapidly release and store oxygen from the environment, thereby switching the oxidation state of the cation (Ce 4+ or Ce 3+ ). Associated with a high mobility of oxygen, the process plays an active role in oxidation reactions such as CO oxidation in three-way catalytic converters 4 and the preferential oxidation of CO in hydrogen excess (PROX), a process for removing CO impurities from reformate hydrogen for fuel cell applications. [5][6][7][8] It was recently shown that metal-ceria powders can be prepared by a one-pot solution combustion synthetic (SCS) route.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of CO oxidation toward metal oxidation state in ceria-supported catalysts: an operando DRIFTS-MS study

Kaftan

Kollhoff

Nguyen

et al. 2016

Catal. Sci. Technol.

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The oxidation of carbon monoxide has been studied on pristine CeO 2 , Rh-CeO 2 , and Pt-CeO 2 powders prepared in one step by solution combustion synthesis (SCS). The reaction was cycled between an oxygenrich and a CO-rich feed with regard to the stoichiometric conditions. CO 2 production was monitored by mass spectrometry, while the surface species were probed by operando DRIFTS (Diffuse Reflectance Infrared Fourier Transform Spectroscopy). Whereas the reaction starts above 150°C on CeO 2 and Rh-CeO 2 and does not depend on the state of the surface (oxidized or reduced), the reaction on Pt-CeO 2 shows strong dependency on the initial state and substantial activity is achieved at much lower temperatures with the CO-rich feed. We relate this result to the change in the oxidation state of Pt via strong interaction with ceria.

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Surface-structure sensitivity of CO oxidation over polycrystalline ceria powders

Cited by 262 publications

References 28 publications

Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts

Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts

On the interaction of Mg with the (111) and (110) surfaces of ceria

Sensitivity of CO oxidation toward metal oxidation state in ceria-supported catalysts: an operando DRIFTS-MS study

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Surface-structure sensitivity of CO oxidation over polycrystalline ceria powders

Cited by 262 publications

References 28 publications

Effect of Reduction Treatment on CO Oxidation with CeO2 Nanorod‐Supported CuOx Catalysts

Effect of Reduction Treatment on CO Oxidation with CeO2 Nanorod‐Supported CuOx Catalysts

On the interaction of Mg with the (111) and (110) surfaces of ceria

Sensitivity of CO oxidation toward metal oxidation state in ceria-supported catalysts: an operando DRIFTS-MS study

Contact Info

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Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts

Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts