Effect of diffusion limitation on the performance of multi-layer oxidation and lean NO x trap catalysts

Václavík, Marek; Novák, Vladimír; Březina, Jan; Kočí, Petr; Gregori, Gregory; Thompsett, David

doi:10.1016/j.cattod.2016.03.013

Cited by 15 publications

(4 citation statements)

References 21 publications

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“…by introducing a higher amount of surface hydroxyl) [16,19,33]. In addition to the above factors, which focus on the chemical properties of the catalyst, the diffusion of reactants and products to and from the catalyst interior also plays a key role in determining the rate of catalytic reactions [34,35]. Thus, materials with a hierarchical structure of different length scales have come to the attention of researchers, due to the efficient mass transfer within the hierarchical architecture [36,37].…”

Section: Introductionmentioning

confidence: 99%

Effects of hierarchical structure on the performance of tin oxide-supported platinum catalyst for room-temperature formaldehyde oxidation

Duan

Song

Cheng

et al. 2017

Chinese Journal of Catalysis

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Section: Introductionmentioning

confidence: 99%

Effects of hierarchical structure on the performance of tin oxide-supported platinum catalyst for room-temperature formaldehyde oxidation

Duan

Song

Cheng

et al. 2017

Chinese Journal of Catalysis

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“…Typically, the LNT catalyst contains storage materials (e.g., BaO/BaCO 3 , CeO 2 ), support materials (e.g., Al 2 O 3 and CeZrO x ), and PGMs (e. g., Pt, Pd, and Rh) [62]. Pt and Pd mainly oxidize NO to NO 2 for storage, whereas Rh aids in NO x reduction and combined with Ceria, promotes water gas shift reactions and steam reforming reactions for H 2 formation [47,63]. The NO x storage and oxidation sites are usually situated in close proximity.…”

Section: Lean No X Trapmentioning

confidence: 99%

Catalytic NO<sub>x</sub> Aftertreatment—Towards Ultra-Low NO<sub>x</sub> Mobility

Sandhu,

Yu,

Zheng

2024

IJAMM

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Article Catalytic NOx Aftertreatment—Towards Ultra-Low NOx Mobility Navjot Sandhu * , Xiao Yu, and Ming Zheng Department of Mechanical, Automotive and Materials Engineering, University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada * Correspondence: sandh12p@uwindsor.ca Received: 26 January 2024 Accepted: 13 March 2024 Published: 20 March 2024 Abstract: The push for environmental protection and sustainability has led to strict emission regulations for automotive manufacturers as evident in EURO VII and EPA2027 requirements. The challenge lies in maintaining fuel efficiency and simultaneously reducing the carbon footprint while meeting future emission regulations. Nitrogen oxides represent one of the major and most regulated components of automotive emissions. The need to meet the stringent requirements regarding NOx emissions in both SI and CI engines has led to the development of a range of in-cylinder strategies and after-treatment techniques. In-cylinder NOx control strategies including charge dilution (fresh air and EGR), low-temperature combustion, and use of alternative fuels (as drop-in replacements or dual fuel operation) have proven to be highly effective in thermal NOx abatement. Aftertreatment methods are required to further reduce NOx emissions. Current catalytic aftertreatment systems for NOx mitigation in SI and CI engines include the three-way catalyst (TWC), selective catalytic reduction (SCR) and lean NOx trap (LNT). This review summarizes various approaches to NOx abatement in IC engines using aftertreatment catalysts. The mechanism, composition, operation parameters and recent advances in each after-treatment system are discussed in detail. The challenges to the current after-treatment scenario, such as cold start light off, catalyst poisoning and the limits of current aftertreatment solutions in relevance to the EURO VII and 2026 EPA requirements are highlighted. Lastly, recommendations are made for future aftertreatment systems to achieve ultra-low NOx emissions.

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“…For the purpose of this study, γ-Al 2 O 3 was not impregnated with platinum group metals as they do not affect porous structure and transport properties of the coating. The γ-Al 2 O 3 -based coatings are typical for three-way catalysts (TWC), Diesel oxidation catalysts (DOC) and NO x storage catalysts (NSRC, LNT) [7].…”

Section: D Reconstruction and Characterization Of Filter Morphologymentioning

confidence: 99%

“…To make the system more compact, the catalytic materials can be coated in several layers on a single substrate [6,7], or the catalyst can be deposited directly into the filter as on-wall layer or inside the porous wall [3,8]. The frequently used combination for Diesel engines is SCR catalyst for selective catalytic reduction of nitrogen oxides coated on filter (SCRF) [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

3D reconstruction and pore-scale modeling of coated catalytic filters for automotive exhaust gas aftertreatment

et al. 2019

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This paper introduces a newly developed methodology for the pore-scale simulation of flow, diffusion and reaction in the coated catalytic filter. 3D morphology of the porous filter wall including the actual distribution of catalytic material is reconstructed from X-ray tomography (XRT) images and further validated with the mercury intrusion porosimetry (MIP). The reconstructed medium is then transformed into simulation mesh for OpenFOAM. Flow through free pores in the substrate as well as through the coated zones is simulated by porousSim-pleFoam solver, while an in-house developed solver is used for component diffusion and reactions. Three cordierite filter samples with different distribution of alumina-based coating ranging from in-wall to on-wall are examined. Veloc-

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Effect of diffusion limitation on the performance of multi-layer oxidation and lean NO x trap catalysts

Cited by 15 publications

References 21 publications

Effects of hierarchical structure on the performance of tin oxide-supported platinum catalyst for room-temperature formaldehyde oxidation

Effects of hierarchical structure on the performance of tin oxide-supported platinum catalyst for room-temperature formaldehyde oxidation

Catalytic NO<sub>x</sub> Aftertreatment—Towards Ultra-Low NO<sub>x</sub> Mobility

3D reconstruction and pore-scale modeling of coated catalytic filters for automotive exhaust gas aftertreatment

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