On the importance of the catalyst redox properties in the N2O decomposition over alumina and ceria supported Rh, Pd and Pt

Parres-Esclapez, S.; Illán-Gómez, M.J.; Lecea, C. Salinas-Martı́nez de; Bueno‐López, Agustín

doi:10.1016/j.apcatb.2010.02.034

Cited by 138 publications

(80 citation statements)

References 28 publications

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“…A detailed analysis of the lowest temperature reduction peak shows a slightly lower reducibility of the catalyst with the lowest activity (Rh25Ce25, see lowest area in the Figure 7) in comparison to the remaining catalysts. This observation is in agreement with the conclusions of previous studies, where a relationship between surface reducibility and N2O decomposition capacity was obtained for a set of RhOx/CeO2 catalysts prepared with different ceria carriers (either pure and doped with La or Pr) [17]. Moreover, the rate limiting step of the RhOx/CeO2 catalyzed N2O decomposition mechanism was reported to be the reduction of the catalysts sites by N2O.…”

Section: H2-tpr Characterizationsupporting

confidence: 81%

“…N2O decomposition on ceria-supported noble metal catalysts was investigated in a previous work, where noble metals (Rh, Pd and Pt) were supported on γ-Al2O3, pure CeO2 and La-and Pr-doped CeO2 [17]. Rh was the best noble metal, and the support strongly affected the activity, ceria-based supports being better as rhodium support than alumina.…”

Section: Introductionmentioning

confidence: 99%

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Effect of RhOx/CeO2 Calcination on Metal-Support Interaction and Catalytic Activity for N2O Decomposition

Rico-Pérez

Bueno‐López

2014

Applied Sciences

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Abstract:The effect of the calcination conditions on the catalytic activity for N2O decomposition of 2.5% RhOx/CeO2 catalysts has been investigated. Ramp and flash calcinations have been studied (starting calcinations at 25 or 250/350 °C, respectively) both for cerium nitrate and ceria-impregnated rhodium nitrate decomposition. The cerium nitrate calcination ramp has neither an effect on the physico-chemical properties of ceria, observed by XRD, Raman spectroscopy and N2 adsorption, nor an effect on the catalysts performance for N2O decomposition. On the contrary, flash calcination of rhodium nitrate improved the catalytic activity for N2O decomposition. This is attributed to the smaller size of RhOx nanoparticles obtained (smaller than 1 nm) which allow a higher rhodium oxide-ceria interface, favoring the reducibility of the ceria surface and stabilizing the RhOx species under reaction conditions.

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Section: H2-tpr Characterizationsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Effect of RhOx/CeO2 Calcination on Metal-Support Interaction and Catalytic Activity for N2O Decomposition

Rico-Pérez

Bueno‐López

2014

Applied Sciences

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“…The absence of praseodymium oxide peaks in CePr/C and PtCe 0.9 Pr 0.1 O y /C (Fig. 8c) is expected, since it is very efficient to dope cerium oxide with praseodymium cations to form Ce-Pr mixed oxides [12,15]. The metal oxide diffraction peaks were also observed in the diffractograms of the fresh electrodes but not in the electrodes obtained after long term CA tests; thus confirming the dissolution of praseodymium oxides and Ce-Pr mixed oxides under the reaction conditions.…”

Section: Xrd and Tem Characterizationmentioning

confidence: 74%

“…Consequently, the high compatibility between Ce and Pr cations allows formation of a solid solution of type Ce x Pr 1-x O y with very interesting catalytic properties. For instance, it has been demonstrated that Ce x Pr 1-x O y catalysts are very active in diesel soot combustion [12][13][14], and also that Ce-Pr mixed oxides are active promoters of the catalytic activity of Rhodium in N 2 O decomposition [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of praseodymium oxide and cerium–praseodymium mixed oxide in the Pt electrocatalyst performance for the oxygen reduction reaction in PAFCs

Mukerjee

Parres-Esclapez

et al. 2011

J Appl Electrochem

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“…The TPR profile of pure CeO 2 shows two broad peaks centered at 550°C and 850 °C. They have been ascribed to the reduction of the surface and bulk Ce 4+ ions to Ce 3+ , respectively [46]. Deposition of cobalt spinel on the ceria surface leaves the bulk reduction peak of ceria intact, whereas the surface reduction is broadened and gradually disappears.…”

Section: Elemental and Structural Characterizationmentioning

confidence: 99%

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

Grzybek

Stelmachowski

Gudyka

et al. 2016

Applied Catalysis B: Environmental

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105

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dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: the role of the interface periphery, Applied Catalysis B, Environmental http://dx.doi.org/10. 1016/j.apcatb.2015.07.027 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. The catalytic tests in deN 2 O reaction revealed that the 10 wt.% of cobalt spinel in supported system is able to reproduce the activity of bare Co 3 O 4 catalyst. However, it was found that the catalyst with the lowest content of Co 3 O 4 equal to 1 wt.% exhibits the highest apparent reaction rate per mass of the spinel active phase. The observed activity was explained basing on the transmission electron microscopy analysis in terms of the dispersion of spinel phase over ceria support. A simple model that accounts for the observed strong dispersion effect is proposed. It consists in a two-step mechanism, where N 2 O is dissociated on the spinel nanograins and the resultant oxygen species are preferentially recombined at the Co 3 O 4 /CeO 2 interface periphery.

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On the importance of the catalyst redox properties in the N2O decomposition over alumina and ceria supported Rh, Pd and Pt

Cited by 138 publications

References 28 publications

Effect of RhOx/CeO2 Calcination on Metal-Support Interaction and Catalytic Activity for N2O Decomposition

Effect of RhOx/CeO2 Calcination on Metal-Support Interaction and Catalytic Activity for N2O Decomposition

Effect of praseodymium oxide and cerium–praseodymium mixed oxide in the Pt electrocatalyst performance for the oxygen reduction reaction in PAFCs

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

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