Effect of NO  adsorption/desorption over ceria-zirconia catalysts on the catalytic combustion of model soot

Atribak, Idriss; Azambre, B.; Bueno‐López, Agustín; Garcı́a-Garcı́a, Avelina

doi:10.1016/j.apcatb.2009.07.015

Cited by 194 publications

(146 citation statements)

References 39 publications

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“…Catalyst synthesis and Catalyst : Soot mixture preparation CeO 2 , ZrO 2 and mixed oxide (Ce x Zr 1-x O 2 ) catalysts were prepared using a co-precipitation technique [33]. The catalysts were mixed in defined ratios (50 catalyst: 1 soot) with a model soot (Printex-U) to approximate a loose contact situation.…”

Section: Methodsmentioning

confidence: 99%

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Attempts at an in situ Raman study of ceria/zirconia catalysts in PM combustion

Sullivan

Dulgheru

Atribak

et al. 2011

Applied Catalysis B: Environmental

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Publisher's statementThis is the author's version of a work that was accepted for publication in Applied Catalysis B: Environmental. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Catalysis B: Environmental, 108-109 (1) Ce (x) Zr (1-x) O 2 catalysts with various Ce / Zr contents were studied using Raman spectroscopy under different gaseous atmospheres, at different temperatures and in the presence of a model soot.Catalysts with high concentrations of Zr fluoresced at elevated temperatures making analysis of their spectra impossible. This effect became even more pronounced at higher temperatures. CeO 2 and solid solutions with relatively low concentrations of Zr showed a red shift and a decrease in intensity of the characteristic F 2g peak at high temperatures under different atmospheres. The magnitude of the latter effect was higher under reducing atmospheres. These changes are reversible upon cooling, showing that they relate to a lattice expansion effect rather than any major chemical change to the material. In the presence of the model soot the Raman spectra of all materials was much decreased due to the absorption of the incident and scattered radiation by the soot particles. The presence of soot does not change the relative intensities or positions of the peaks in the spectra of the solid solutions. Evidence is shown for the production of a Ce 3+ -CO species following interaction between the soot and the surface at high temperature in an inert atmosphere.

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Section: Methodsmentioning

confidence: 99%

“…The soot combustion activity and the room temperature Raman spectra of the materials we discuss here have previously been reported [33]. It has been shown that all these materials promote soot oxidation in air and NO / O 2 (when reactivity profiles are compared to those of non-catalysed soot oxidations).…”

Section: Introductionmentioning

confidence: 99%

Attempts at an in situ Raman study of ceria/zirconia catalysts in PM combustion

Sullivan

Dulgheru

Atribak

et al. 2011

Applied Catalysis B: Environmental

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“…Cu or Fe-chabazite hardly works in HC-SCR. Noble metal based catalysts, such as Pt/Al O and Pd/Al O , exhibit a high deNO activity in a very narrow temperature range (200-300 ∘ C), as shown in Figure 1.8 [34]. Metal oxide catalysts for the reduction of NO with hydrocarbons have received an extensive attention due to their high-temperature activity and hydrothermal stability.…”

Section: No Reduction With Hydrocarbons (Hcs)mentioning

confidence: 99%

“…NO and N O are common side products in the NO reduction technologies especially when using noble metal as an active ingredient in the catalyst composition [32][33][34][35]. Therefore, the study on NO reaction processes over noble metal/ceria is essential.…”

Section: No Reduction Routine and Its Selectivity To Nmentioning

confidence: 99%

“…The following five steps can describe the NSR system operation during the lean-rich cycle: 18 1. Introduction Figure 1.8: Reduction of NO by C H under lean conditions vs. temperature on monometallic Pt, Rh, and Pd based catalysts (500 ppm NO, 1000 ppm C H , and 5% O , gas hourly space velocity 60 000 L/L/h) [34]. • Oxidation of NO to NO (lean period)…”

Section: No Storage Reduction (Nsr)mentioning

confidence: 99%

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Next Generation Automotive DeNO_x Catalysts: Ceria What Else?

et al. 2015

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Temporal analysis of products (TAP) was used to study NO reduction to N2 over H2 and C3H6‐reduced La‐Zr doped ceria at 560 °C. (La‐Zr doped) ceria is found to be capable of fuel oxidation and NO reduction. NO dissociates on oxygen anion defects, thereby refilling these vacancies with oxygen anions and forming N2. The carbonaceous deposits, in case the catalyst was reduced by C3H6, are oxidized by oxygen species originating from lattice oxygen. This recreates oxygen anion defects, which enables substantial additional NO reduction. These findings may open a new perspective on the understanding of DeNOx by hydrocarbons.

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Catalytic oxidation of solid carbon and carbon monoxide over cerium‐zirconium mixed oxides

Yin¹,

Davis²,

Mahamulkar³

et al. 2016

AIChE Journal

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A series of cerium‐zirconium mixed oxides was prepared and evaluated in the catalytic oxidation of solid coke with 10 vol % O2 in He at 673 K using a thermogravimetric analyzer. The measured first order rate constant for coke oxidation was proportional to the catalyst loading when the mass ratio of catalyst to coke was low, which enabled the calculation of a surface area specific reaction rate. The validity of the normalization method was confirmed by performing CO oxidation over the cerium‐zirconium mixed oxides in a fixed bed reactor at 573 K. Although there was no correlation between the coke oxidation rate and the oxygen storage capacity or the reducibility of the catalysts, there was an excellent correlation to the CO oxidation rate. Kinetic studies of both coke and CO oxidation suggested an important role of surface lattice oxygen from the catalyst in the two reactions. © 2016 American Institute of Chemical Engineers AIChE J, 63: 725–738, 2017

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Effect of NO adsorption/desorption over ceria-zirconia catalysts on the catalytic combustion of model soot

Cited by 194 publications

References 39 publications

Attempts at an in situ Raman study of ceria/zirconia catalysts in PM combustion

Attempts at an in situ Raman study of ceria/zirconia catalysts in PM combustion

Next Generation Automotive DeNO_x Catalysts: Ceria What Else?

Catalytic oxidation of solid carbon and carbon monoxide over cerium‐zirconium mixed oxides

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Effect of NO adsorption/desorption over ceria-zirconia catalysts on the catalytic combustion of model soot

Cited by 194 publications

References 39 publications

Attempts at an in situ Raman study of ceria/zirconia catalysts in PM combustion

Attempts at an in situ Raman study of ceria/zirconia catalysts in PM combustion

Next Generation Automotive DeNOx Catalysts: Ceria What Else?

Catalytic oxidation of solid carbon and carbon monoxide over cerium‐zirconium mixed oxides

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Product

Resources

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Next Generation Automotive DeNO_x Catalysts: Ceria What Else?