Ce effect on the selective catalytic reduction of NO with CH4 on Pd-mordenite in the presence of O2 and H2O

Costilla, Ignacio Oscar; Sánchez, Miguel; Volpe, María Alicia; Gigola, Carlos Eugenio

doi:10.1016/j.cattod.2011.03.025

Cited by 17 publications

(16 citation statements)

References 18 publications

(29 reference statements)

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“…Promising results for Pd/Ce system have been presented already [34,35]; however, the role of various Pd and Ce species in the NO x CH 4 -SCR requires further investigation. The aim of this work is to further understand the structure-reactivity relationship in the Pd/Ce zeolites, in particular the role of different metal species in the enhancement of their catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

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On the enhancing effect of Ce in Pd-MOR catalysts for NOx CH4-SCR: A structure-reactivity study

Mendes‐Faia

Zholobenko

Thibault-Starzyk

et al. 2016

Applied Catalysis B: Environmental

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2 Graphical abstract NO oxida)onin ion-exchange position, probably in two different sites within the MOR framework.The addition of cerium to Pd-HMOR enhances its catalytic performance for NO x CH 4 -SCR.With 1 wt.% Ce, both NO x conversion into N 2 and CH 4 selectivity towards SCR have increased. Small CeO 2 clusters interacting with palladium are likely to play a major role in this catalytic reaction. The number of such species increases up to Ce loading of ca. 2 wt.%.However, above 3 wt%, NO x conversion values decrease with Ce loading, which is attributed to the formation of bulk CeO 2 species not interacting with palladium.

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Section: Introductionmentioning

confidence: 99%

“…As in the case of the Co-based systems, the use of a second metal in the Pd-based catalyst to enhance its performance has been widely reported, e.g. Pd/Pt [30], Pd/In [31,32], and Pd/Ce [33][34][35] systems.…”

Section: Introductionmentioning

confidence: 99%

On the enhancing effect of Ce in Pd-MOR catalysts for NOx CH4-SCR: A structure-reactivity study

Mendes‐Faia

Zholobenko

Thibault-Starzyk

et al. 2016

Applied Catalysis B: Environmental

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“…However, the use of cobalt in an eventual application of this type appears to be controversial and there might be some drawbacks to its use in a commercial application. Pd-zeolite catalysts, which catalytic performance can be enhanced by adding a second metal such as cerium [6,7], might contribute to the development of a cobalt-free formulation suitable for commercial application. (2)-HMOR.…”

Section: Introductionmentioning

confidence: 99%

Application of PdCe-HMOR Catalyst as NOx CH4-SCR System for Heavy-Duty Vehicles Moved by Natural Gas

Mendes‐Faia

Lauga²,

Capela³

et al. 2016

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In this work a cobalt-free zeolite-based catalyst formulation is proposed for NO x CH 4 -SCR towards a commercial application of after-treatment system for heavy-duty vehicles moved by natural gas (lean-gas burn engines). PdCe-HMOR catalyst was characterised by H 2 -TPR, DRS UV-Vis and TEM/EDS. The effect of [CH 4 ]/ [NO] in the gas feed was studied in order to assess the catalytic performance under simulated dynamic engine conditions. The catalyst was also tested with a representative gas feed of real exhaust gases of a heavy-duty vehicle's engine (lean-burn conditions) powered by natural gas.

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“…On the other hand, the problem of hydrothermal stability can also be improved by adding Ce as a promoter. Costilla et al 46 found that the presence of Ce enhanced the activity for NO conversion and the selectivity to N 2 on Pd/H-MOR catalyst in SCR-CH 4 in the presence of H 2 O. Therefore in this work, Cu metal was modified by loading In our recent work, 47 loading of copper metal on coreshell Al-MCM-41 by different techniques-ion-exchange method, impregnation method, and substitution methodwere characterized and the existence of different copper species in the structure was identified.…”

Section: Introductionmentioning

confidence: 99%

Role of Copper and Cerium on Core–Shell Al-MCM-41 in NO Reduction via a SCR-CH₄

Intana

Föttinger

Rupprechter

et al. 2018

j nanosci nanotechnol

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Copper species in the structure of Cu/core-shell Al-MCM-41 catalysts prepared by different techniques of Cu loading-substitution (S), ion-exchange (E), and impregnation (I) methods-were tested for NO reduction via a selective catalytic reaction with methane. Cerium was added to enhance the performance of copper. It was found that the 1.5%Ce-SEI-Cu/Al-MCM-41, in which Cu was loaded by all three techniques gave the highest NO conversion of 85% at 500 °C. Based on the results from FT-IR in-situ experiment, the mechanism of SCR-CH4 reaction is proposed. The ion-exchange method gives the best performance of SCR-CH4 reaction when compared with the other methods, because the Cu of reduced catalyst in this method exists in isolated Cu(I), which is an active site of the SCR-CH4 reaction. With H2O in the feed, the NO conversion of 1.5%-Ce-SEI-Cu/Al-MCM-41 catalyst is found to be rather stable.

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Ce effect on the selective catalytic reduction of NO with CH4 on Pd-mordenite in the presence of O2 and H2O

Cited by 17 publications

References 18 publications

On the enhancing effect of Ce in Pd-MOR catalysts for NOx CH4-SCR: A structure-reactivity study

On the enhancing effect of Ce in Pd-MOR catalysts for NOx CH4-SCR: A structure-reactivity study

Application of PdCe-HMOR Catalyst as NOx CH4-SCR System for Heavy-Duty Vehicles Moved by Natural Gas

Role of Copper and Cerium on Core–Shell Al-MCM-41 in NO Reduction via a SCR-CH₄

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Ce effect on the selective catalytic reduction of NO with CH4 on Pd-mordenite in the presence of O2 and H2O

Cited by 17 publications

References 18 publications

On the enhancing effect of Ce in Pd-MOR catalysts for NOx CH4-SCR: A structure-reactivity study

On the enhancing effect of Ce in Pd-MOR catalysts for NOx CH4-SCR: A structure-reactivity study

Application of PdCe-HMOR Catalyst as NOx CH4-SCR System for Heavy-Duty Vehicles Moved by Natural Gas

Role of Copper and Cerium on Core–Shell Al-MCM-41 in NO Reduction via a SCR-CH4

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Role of Copper and Cerium on Core–Shell Al-MCM-41 in NO Reduction via a SCR-CH₄