Application of NOx Adsorber to Diesel Depollution: Performances and Durability

Dementhon, J. B.; Colliou, Thierry; Martin, B.; Bouchez, Matthias; Guyon, M.; Messaoudi, I.; Noirot, R.; Michoń, S; Gérentet, C.; Pierron, Loys

doi:10.2516/ogst:2003009

Cited by 4 publications

(2 citation statements)

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“…These compositions are given in table 1. CeO 2 -ZrO 2 -based samples were obtained through a wet chemistry process, starting from aqueous solutions and patented by Rhodia [7] leading to pure solid solutions. The sample referred as BaAl was prepared by incipient-wetness impregnation method.…”

Section: Methodsmentioning

confidence: 99%

Rare earths based oxides as alternative materials to Ba in NOx-trap catalysts

Rohart¹,

Bellière-Baca²,

Yokota³

et al. 2007

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The reduction of NOx from Diesel Engines is a major issue of automotive catalysis. In this paper, we investigate basic rare earths oxides (such as La 2 O 3 , Nd 2 O 3 or Pr 6 O 11 ) used as NOx-trap sites in replacement of Ba. These species are intimately mixed with (CeZr) solid solutions and the thus obtained mixed oxides are considered as Pt carrier. Investigations on powder model Pt-(CeZr)/RE 2 O 3 (or Pr 6 O 11 ) catalysts show promising results. These model catalysts present high NOx storage capacity, especially at low temperature, and improved resistance to sintering at 700°C under lean hydrothermal conditions. Moreover, they show total desulfation at 600°C i.e. 150°C lower than current Pt-(BaO/Al 2 O 3 ) technologies and are thus considered as more durable technologies.

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Section: Methodsmentioning

confidence: 99%

Rare earths based oxides as alternative materials to Ba in NOx-trap catalysts

Rohart¹,

Bellière-Baca²,

Yokota³

et al. 2007

Top Catal

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“…Engine test bench essays confirm that commercial NO x adsorbers are extremely sulfur-sensitive and that even sophisticated ultra-low-sulfur fuels containing 10 ppm S poison the NO x storage function [6]. Exposure to SO 2 in the presence of O 2 leads to a disappearing of the carbonate IR bands on a model Pt/Ba/Al 2 O 3 catalyst and to their progressive replacement by distinctive surface and bulk sulfate bands [7].…”

Section: Introductionmentioning

confidence: 90%

Sulfur Deactivation of NO_xStorage Catalysts: A Multiscale Modeling Approach

Rankovic

Chizallet

Nicolle

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Empoisonnement des mate´riaux de stockage des NO x par le soufre : approche multi-e´chelles -Les pie`ges a`NO x repre´sentent une technologie prometteuse pour la re´duction des e´missions d'oxydes d'azote issus des moteurs ope´rant en me´lange pauvre. Leur utilisation est limite´e par la pre´sence de compose´s soufre´s dans les gaz d'e´chappement. Le soufre contenu dans le carburant et le lubrifiant est oxyde´lors de la combustion en SO 2 et SO 3 . Ces oxydes de soufre pre´sentent une forte affinite´pour le mate´riau de stockage du pie`ge, la formation de sulfate e´tant favorise´e thermodynamiquement. Cette formation contribue au blocage des sites d'adsorption des NO x et influence l'ope´ration de l'organe de post-traitement. La mode´lisation mole´culaire repre´sente un outil pre´cieux pour pre´dire le comportement et les performances du syste`me catalytique. Notre e´tude pre´sente une me´thodologie d'exploitation des calculs ab initio pour la formulation de mode`les cine´tiques de´veloppe´s dans la librairie de post-traitement ve´hicule IFP Exhaust. Nous illustrons notre approche par le cas de l'adsorption de SO 3 sur un mate´riau mode`le, BaO. Afin d'obtenir une description fide`le du mate´riau de stockage re´el, l'adsorption de SO 3 est de´crite sur plusieurs sites : terrasses, marches, crans et le site massique. Des analyses de sensibilite´et de vitesses de re´actions permettent d'obtenir une compre´hension plus approfondie des phe´nome`nes d'empoisonnement mis en jeu.Abstract -Sulfur Deactivation of NO x Storage Catalysts: A Multiscale Modeling ApproachLean NO x Trap (LNT) catalysts, a promising solution for reducing the noxious nitrogen oxide emissions from the lean burn and Diesel engines, are technologically limited by the presence of sulfur in the exhaust gas stream. Sulfur stemming from both fuels and lubricating oils is oxidized during the combustion event and mainly exists as SO x (SO 2 and SO 3 ) in the exhaust. Sulfur oxides interact strongly with the NO x trapping material of a LNT to form thermodynamically favored sulfate species, consequently leading to the blockage of NO x sorption sites and altering the catalyst operation. Molecular and kinetic modeling represent a valuable tool for predicting system behavior and evaluating catalytic performances. The present paper demonstrates how fundamental ab initio calculations can be used as a valuable source for designing kinetic models developed in the IFP Exhaust library, intended for vehicle simulations. The concrete example we chose to illustrate our

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2013

Periodic Operation of Chemical Reactors

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Application of NOx Adsorber to Diesel Depollution: Performances and Durability

Cited by 4 publications

References 10 publications

Rare earths based oxides as alternative materials to Ba in NOx-trap catalysts

Rare earths based oxides as alternative materials to Ba in NOx-trap catalysts

Sulfur Deactivation of NO_xStorage Catalysts: A Multiscale Modeling Approach

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Application of NOx Adsorber to Diesel Depollution: Performances and Durability

Cited by 4 publications

References 10 publications

Rare earths based oxides as alternative materials to Ba in NOx-trap catalysts

Rare earths based oxides as alternative materials to Ba in NOx-trap catalysts

Sulfur Deactivation of NOxStorage Catalysts: A Multiscale Modeling Approach

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Product

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Sulfur Deactivation of NO_xStorage Catalysts: A Multiscale Modeling Approach