The chemistry of the NO/NO2–NH3 “fast” SCR reaction over Fe-ZSM5 investigated by transient reaction analysis

Grossale, A.; Nova, Isabella; Tronconi, Enrico; Chatterjee, Daniel; Weibel, Michel

doi:10.1016/j.jcat.2008.03.027

Cited by 425 publications

(292 citation statements)

References 19 publications

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“…In the SCR reaction condition, this M-O-NO 2 species could rapidly react with adjacent adsorbed NH 4 O [55]. This reaction mechanism is very similar as the one proposed by other researchers, in which the reduction of ammonium nitrate by NO is an important step [30,32]. The in situ Fig.…”

Section: In Situ Drifts Of Nh 3 and No X Adsorptionsupporting

confidence: 52%

“…2N 2 + 3H 2 O [16,27,28]. The effect of NO 2 and the detailed ''fast SCR'' reaction mechanism have been studied extensively over conventional V 2 O 5 -WO 3 /TiO 2 and Fe-zeolite catalysts (such as Fe/HBEA and Fe/ZSM-5) by many researchers [4,[29][30][31][32][33]. In this study, the effect of Mn substitution amounts on NO oxidation activity of iron titanate catalyst was also investigated and the results are shown in Fig.…”

Section: No and Nh 3 Oxidation Activities Of Fe A Mn 1àa Tio X Catalystsmentioning

confidence: 99%

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Effect of manganese substitution on the structure and activity of iron titanate catalyst for the selective catalytic reduction of NO with NH3

Liu

Ding

et al. 2009

Applied Catalysis B: Environmental

614

355

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Section: In Situ Drifts Of Nh 3 and No X Adsorptionsupporting

confidence: 52%

Section: No and Nh 3 Oxidation Activities Of Fe A Mn 1àa Tio X Catalystsmentioning

confidence: 99%

Effect of manganese substitution on the structure and activity of iron titanate catalyst for the selective catalytic reduction of NO with NH3

Liu

Ding

et al. 2009

Applied Catalysis B: Environmental

614

355

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“…Notons que dans certains cas, différentes formes adsorbées de NH 3 doivent être considérées (Grossale et al 2008) (Frobert, Creff, Raux, Charial, Audouin & Gagnepain 2009). Aussi, l'oxydation directe de l'ammoniac est importante puisque le débit d'ammoniac constitue la variable de commande pour le système SCR, et la proportion qui n'est pas utilisée dans l'oxydation des HC doit être connue avec précision :…”

Section: Piège à Nox (Pànox)unclassified

“…Note that, in some cases, different forms of adsorbed NH 3 must be considered (Grossale et al 2008) (Frobert, Creff, Raux, Charial, Audouin & Gagnepain 2009). Further direct oxidation of ammonia is important because ammonia represents the control variable in SCR control, and it must be known when it is not used for NOx reduction.…”

Section: Urea Selective Catalytic Reduction (Urea-scr)mentioning

confidence: 99%

Model-based temperature control of a diesel oxidation catalyst

Lepreux¹,

Creff²,

Petit³

2012

Journal of Process Control

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To cite this version:Olivier Lepreux. Model-based Temperature Control of a Diesel Oxidation Catalyst . Mathematics T H E S E pour obtenir le grade de DOCTEUR DE L'ECOLE NATIONALE SUPERIEURE DES MINES DE PARIS RésuméLe problème étudié dans cette thèse est la commande d'un système DOC (Diesel Oxidation Catalyst) tel qu'utilisé dans les systèmes de dépollution des gaz d'échappement des moteurs Diesel automobiles.Ce système est par nature un système à paramètres répartis en raison de sa géométrie allongée parcourue par un flux gazeux en contact avec un catalyseur réparti. Après avoir étudié expérimenta-lement ce système, nous avons décidé de prendre en compte cette nature répartie, qui comme on le montre, se retrouve également dans les autres systèmes de dépollution (filtres à particules, pièges à NOx, SCR).Une première contribution du manuscrit consiste en un modèle du système DOC. Celui-ci est obtenu par des simplifications successives, justifiées expérimentalement (observations, estimations des ordres de grandeurs) ou par analyse des équations régissant la dynamique du système (déve-loppements asymptotiques, changements de variables). Ce modèle permet de rendre compte de la complexité de la réponse de la température de sortie du DOC à des variations des grandeurs d'entrée. En particulier, les effets de réponses inverses et de retards sont bien représentés.Une seconde contribution est un ensemble d'algorithmes de commande (précompensation, rétro-action, et synchronisation) permettant de maîtriser les phénomènes thermiques dans le DOC.Ces deux contributions ont été testées expérimentalement et validées. En conclusion, les performances obtenues sont évaluées. En résumé, en utilisant l'approche présentée dans ce manuscrit, il est possible de commander, en conditions réelles, la température de sortie du DOC à ±15 • C. 6 SummaryThe problem studied in this thesis is the control of a DOC (Diesel Oxidation Catalyst) as used in aftertreatment systems of diesel vehicles.This system is inherently a distributed parameter system due to its elongated geometry where a gas stream is in contact with a distributed catalyst. After having studied this system experimentally, we decided to take into account its distributed nature, which as shown, is also found in other aftertreatment devices (particulate filters, NOx traps, SCR).A first contribution of the thesis is a model for the DOC system. It is obtained by successive simplifications justified either experimentally (from observations, estimates of orders of magnitudes) or by an analysis of governing equations (through asymptotic developments, change of variables). This model can account for the complexity of the temperature response of DOC output to changes in input variables. In particular, the effects of inverse responses and delays are well represented.A second contribution is a combination of algorithms (feedback, feedforward, and synchronization) to control the thermal phenomena in the DOC.Both contributions have been tested and validated experimentally. In conclusion, the o...

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“…4N 2 ? 6H 2 O), is drawing more and more attention in recent years [4][5][6][7][8]. The reaction between equimolar NO-NO 2 and NH 3 is ca.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of Nitric Oxide to Nitrogen Dioxide on Ru-FAU

Hao

et al. 2009

Catal Lett

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Ru-FAU samples were prepared by wet impregnation and studied as promising catalysts for NO oxidation. The existence of rare earth ions in FAU structure showed positive effect on NO oxidation while the existence of alkali metal ions on cation sites showed negative effect. As a result, Ru-REY exhibited the best activity and a maximal NO conversion of ca. 94% was obtained at 250°C at a very high WHSV of 180,000 h -1 .

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The chemistry of the NO/NO2–NH3 “fast” SCR reaction over Fe-ZSM5 investigated by transient reaction analysis

Cited by 425 publications

References 19 publications

Effect of manganese substitution on the structure and activity of iron titanate catalyst for the selective catalytic reduction of NO with NH3

Effect of manganese substitution on the structure and activity of iron titanate catalyst for the selective catalytic reduction of NO with NH3

Model-based temperature control of a diesel oxidation catalyst

Catalytic Oxidation of Nitric Oxide to Nitrogen Dioxide on Ru-FAU

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