Modeling periodic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si141.gif" display="inline" overflow="scroll"><mml:msub><mml:mrow><mml:mi>NO</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math> storage–reduction in the presence of CO2

Gangwal, V.R.; Scholz, Cordula; Croon, M.H.J.M. de; Schouten, J.C.

doi:10.1016/j.ces.2006.12.078

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…The most active sites are the well dispersed barium particles. Their results are supported by those of Gangwal et al [21] who proposed two different barium sites, semi-bulk and bulk species. The latter authors also showed that the NOx trapping occurs first on semi-bulk species whereas the bulk sites are active only in the later stage of trapping.…”

Section: Nox Storage Capacity Measurementssupporting

confidence: 78%

NOx storage properties of Pt/Ba/Al model catalysts prepared by different methods

Corbos

Courtois²,

Can³

et al. 2008

Applied Catalysis B: Environmental

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The influence of a pre-treatment at 700°C, either under a O2/N2 mixture or only under N2, and followed by a hydrothermal aging at 700°C under wet air, was studied for Pt/Ba/Al NSR model catalysts prepared by different methods: (i) successive impregnation of Ba and Pt, (ii) co-addition of Pt and Ba and (iii) barium precipitation followed by Pt impregnation. The catalysts were evaluated by NOx storage capacity measurements and were characterized by N2 adsorption, XRD, CO2-TPD, H2 chemisorption and H2-TPR. The pre-treatment under N2 largely improves the NOx storage performance in the whole studied temperature range (200°C-400°C), with or without H2O and CO2 in the inlet gas. The better NOx storage properties of the catalysts treated under N2 before aging are due to (i) a higher NO oxidation activity (mainly linked to a higher platinum dispersion) (ii) a higher number of NOx storage sites resulting from a higher barium dispersion, and consequently to (iii) a higher Pt-Ba proximity.

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Section: Nox Storage Capacity Measurementssupporting

confidence: 78%

NOx storage properties of Pt/Ba/Al model catalysts prepared by different methods

Corbos

Courtois²,

Can³

et al. 2008

Applied Catalysis B: Environmental

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“…Recently, it has been shown that NO and NO 2 can be adsorbed on the surface of Pt impregnated Al 2 O 3 . 52 Similarly adsorption of aromatic compounds containing -NO 2 groups on clay 53 and silica materials 54 have also been reported. The earlier studies and the present work support Ag catalysed NO 2 À oxidation and reduction at the Ag-NEEs.…”

Section: Nanoelectrode Ensemble Characteristics Of the Modified Elect...mentioning

confidence: 80%

Electrochemical determination of nitrite using silver nanoparticles modified electrode

Pal

Ganesan

2010

Analyst

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In this work, we report the fabrication and characterization of silver nanoelectrode ensembles (Ag-NEEs) on a glassy carbon electrode. For this purpose, Ag nanoparticles (NPs) were anchored to the mercaptopropyl functionalized MCM-41 type silica spheres utilizing the chemisorption property of Ag NPs by -SH groups. The successful anchoring of Ag NPs into the silica matrix is characterized by several techniques including UV-vis diffuse reflectance and X-ray powder diffraction methods. The surface morphology of the Ag-NEEs was assessed by scanning and transmission electron microscopy (SEM and TEM respectively). Further, nitrite (NO(2)(-)) is electrocatalytically oxidized at Ag-NEEs, which leads to a sensitive determination of NO(2)(-). The fabrication, characterization, and efficient sensing of NO(2)(-) at the Ag-NEEs are presented.

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“…Epling et al observed the inhibition of NOx storage in presence of CO 2 and H 2 O, 38 mechanistically elucidated by Forzatti et al 33 and Lindholm et al 77 Several models taking into account the coexistence of different barium species have also been developed. 78,79 In the present model, barium storage sites are considered as equivalent (denoted Σ) regardless of their chemical nature. The validity of the present model is therefore limited to water-and CO 2 -free experimental conditions.…”

Section: Nox Storage On Pt/ba/al 2 Omentioning

confidence: 99%

Detailed Kinetic Modeling Study of NOx Oxidation and Storage and Their Interactions over Pt/Ba/Al₂O₃ Monolith Catalysts

2010

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The concept of nitrogen oxide storage-reduction (NSR) is a promising aftertreatment technology for reducing NOx emissions from lean-burn engine exhaust. The present work focuses on the first two steps of the overall NSR mechanism, namely, NO to NO 2 oxidation and NOx storage. The governing storage mechanisms are mainly elucidated on the model catalysts such as Pt/Ba/Al 2 O 3 . A unique detailed NO oxidation kinetic model over Pt/Al 2 O 3 was conceived based on literature data and validated over a wide range of experimental conditions. This detailed mechanism was then globalized to obtain a Langmuir-Hinshelwood rate expression, which resulted in a reduced CPU cost in reactor computations. The global oxidation model predicts various experimental NO and NO 2 profiles well. Further, a detailed kinetic model for NOx storage over Ba/Al 2 O 3 was developed and validated against different experimental data. Finally, the detailed oxidation and storage schemes were successfully coupled and species spillover between the noble metal and the storage material was accounted for. The experimental NO and NO 2 profiles obtained from the NOx storage experiments over Pt/Ba/Al 2 O 3 could be reproduced by the detailed coupled model. Reaction pathway analyses and sensitivity studies were performed to provide a more comprehensive insight into the system behavior.

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Modeling periodic NOx storage–reduction in the presence of CO2

Cited by 6 publications

References 18 publications

NOx storage properties of Pt/Ba/Al model catalysts prepared by different methods

NOx storage properties of Pt/Ba/Al model catalysts prepared by different methods

Electrochemical determination of nitrite using silver nanoparticles modified electrode

Detailed Kinetic Modeling Study of NOx Oxidation and Storage and Their Interactions over Pt/Ba/Al₂O₃ Monolith Catalysts

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Modeling periodic NOx storage–reduction in the presence of CO2

Cited by 6 publications

References 18 publications

NOx storage properties of Pt/Ba/Al model catalysts prepared by different methods

NOx storage properties of Pt/Ba/Al model catalysts prepared by different methods

Electrochemical determination of nitrite using silver nanoparticles modified electrode

Detailed Kinetic Modeling Study of NOx Oxidation and Storage and Their Interactions over Pt/Ba/Al2O3 Monolith Catalysts

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Product

Resources

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Detailed Kinetic Modeling Study of NOx Oxidation and Storage and Their Interactions over Pt/Ba/Al₂O₃ Monolith Catalysts