Modeling and Numerical Analysis of NOx Storage-Reduction Catalysts - On the Two Effects of Rich-Spike Duration

Kojima, Shinji; Baba, Naoki; Matsunaga, Shigenori; Senda, Kouji; Katoh, Kenji; Itoh, Takaaki

doi:10.4271/2001-01-1297

Cited by 14 publications

(15 citation statements)

References 9 publications

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“…The processes within the short rich phase are highly transient, involving internal transport effects, interactions between NO x storage components, catalytic noble metals and oxygen storage materials [10]. Exothermic effects also play very important role in the practical application, i.e., under nearly adiabatic conditions [11].…”

Section: Introductionmentioning

confidence: 99%

Transient behaviour of catalytic monolith with NO storage capacity

et al. 2007

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Section: Introductionmentioning

confidence: 99%

Transient behaviour of catalytic monolith with NO storage capacity

et al. 2007

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“…Schneider 7 performed density functional theory (DFT) calculations and determined that the adsorption energies from first-principle calculations were very similar to those derived by Olsson et al using detailed kinetic simulations. There are also several studies available in the literature that involve global mechanisms and different control-oriented models. ,− Hepburn and co-workers 9,10 developed a kinetic model for NO x storage on a barium-containing catalyst, and they used a shrinking-core model to describe mass transport in the barium particles. Tuttlies et al also included mass-transfer limitations in the barium particles in their model.…”

Section: Introductionmentioning

confidence: 99%

Global Kinetic Modelling of a Supplier Barium- and Potassium-Containing Lean NO_x Trap

Olsson

Monroe

Blint

2006

Ind. Eng. Chem. Res.

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Kinetic modeling, in combination with flow reactor experiments, was used in this study to simulate a supplier lean NO x trap (LNT). The LNT catalyst used is a commercial catalyst that contains barium and potassium as storage components. The results presented in this paper are a continuation of a previous study, where a global kinetic model for NO x storage was developed for a model Pt/Rh/BaO/Al2O3 catalyst. In this work, a simplified model is used, where NO oxidation, nitrite, and nitrate formation are lumped together into one reaction, and the model predicts the total NO x . In this model, only one reaction step must be tuned for each storage component: that is, in our case, one reaction for the formation of barium nitrate and one reaction for potassium nitrate. A broad range of experimental conditions was used when developing this model; five temperatures (200, 300, 400, 500, and 600 °C) and three different inlet NO concentrations (100, 200, and 300 ppm) were used. Water and CO2 were present in all experiments, because these can affect the storage behavior. The reductant used in the regeneration period was CO. Long lean and rich cycles were used to capture the kinetics of the reactions accurately. The model was able to describe all 15 experiments well and could adequately capture the amount of stored NO x during the lean period and the NO x conversion during the rich period, including the NO x breakthrough peak that occurred at the beginning of the rich period. The model was validated with short lean−rich cycling experiments, where the lean period was 30 s and the rich period was 2 s. The model could predict the outlet NO x concentration well, and the error for the average conversion was only 1%−2% in the validation simulations.

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“…In [48], the model is extended by modifying the purge model to capture the interactions between the oxygen storage and NO x storage mechanisms in the LNT. By separately modeling the releasing and conversion reactions during the purge phase, the integrated model is able to replicate experimentally observed NO x spikes during the purge phase [49]. In another modification to the original model, air-fuel ratio, λ, is used instead of W CO, in in the functions that represent the NO x release rate and conversion efficiency, making the model more amenable to control implementation.…”

Section: Lean Aftertreatment Modelmentioning

confidence: 99%

Automotive Powertrain Control - A Survey

Cook

Sun²,

Buckland

et al. 2008

Asian Journal of Control

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This paper surveys recent and historical publications on automotive powertrain control. Control-oriented models of gasoline and diesel engines and their aftertreatment systems are reviewed, and challenging control problems for conventional engines, hybrid vehicles and fuel cell powertrains are discussed. Fundamentals are revisited and advancements are highlighted. A comprehensive list of references is provided.

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Modeling and Numerical Analysis of NOx Storage-Reduction Catalysts - On the Two Effects of Rich-Spike Duration

Cited by 14 publications

References 9 publications

Transient behaviour of catalytic monolith with NO storage capacity

Transient behaviour of catalytic monolith with NO storage capacity

Global Kinetic Modelling of a Supplier Barium- and Potassium-Containing Lean NO_x Trap

Automotive Powertrain Control - A Survey

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Modeling and Numerical Analysis of NOx Storage-Reduction Catalysts - On the Two Effects of Rich-Spike Duration

Cited by 14 publications

References 9 publications

Transient behaviour of catalytic monolith with NO storage capacity

Transient behaviour of catalytic monolith with NO storage capacity

Global Kinetic Modelling of a Supplier Barium- and Potassium-Containing Lean NOx Trap

Automotive Powertrain Control - A Survey

Contact Info

Product

Resources

About

Global Kinetic Modelling of a Supplier Barium- and Potassium-Containing Lean NO_x Trap