Numerical Simulation for Designing Next Generation TWC System with Detailed Chemistry

Yamauchi, Tomofusa; Kubo, Shuichi; Mizukami, Tomohito; Satô, Noboru; Aono, Norihiko

doi:10.4271/2008-01-1540

Cited by 10 publications

(7 citation statements)

References 11 publications

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“…This approach can become too complex when attempting to simulate experiments with real exhaust gas, where the number of chemical species present is very high. Thus, the application of detailed kinetics models for real-world driving cycle simulations can be cumbersome, although some models of this category have also been applied for the simulation of legislated driving cycles …”

Section: Introductionmentioning

confidence: 99%

A Simplified Three-Way Catalyst Model for Transient Hot-Mode Driving Cycles

Tsinoglou

Weilenmann

2009

Ind. Eng. Chem. Res.

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Numerous models for the simulation of chemical phenomena in three-way catalytic converters (3WCCs) have been proposed in the literature, ranging from models of the detailed mechanism of the catalytic reactions on the surface to purely empirical correlations for the pollutant conversion efficiency. The application of these models for transient exhaust-gas conditions, such as real-world driving cycles, usually involves a tradeoff between the chemical background of the model, on one hand, and the computational load and ease of model parametrization on the other. In this work, a simplified mathematical model to simulate pollutant conversion in three-way catalytic converters is developed, that has a low computational load and ease of parametrization as primary priorities, but without completely disregarding the chemical background. The intended application of this model is the simulation of pollutant emissions from pilot fleets of vehicles, under real-world driving cycles, starting with a hot engine. Its main novelty is that it models the complex chemical phenomena in a 3WCC almost entirely on the basis of oxygen storage and release dynamics. One-dimensional simulation of the heat-and mass-transfer phenomena is also included in the model, based on well-established approaches from the literature. The model is validated against a large database of measured driving cycles, performed with different types of passenger cars. It is found to present an acceptable degree of correlation between simulated and experimental results, in terms of both instantaneous and cumulative pollutant emissions.

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Section: Introductionmentioning

confidence: 99%

A Simplified Three-Way Catalyst Model for Transient Hot-Mode Driving Cycles

Tsinoglou

Weilenmann

2009

Ind. Eng. Chem. Res.

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“…While mathematical modeling for the diffusion process of ceria at high temperatures (i.e., above 700 °C) has been reported [18-21], the diffusion-controlled oxygen transport process at low-temperatures (i.e., below 250 °C) remains unreported in the existing literature. Furthermore, modeling reaction kinetics in macro-porous conventional catalytic converters [22,23] and three-way catalyst wash-coated lters [24,25] have been extensively discussed in the literature. This study primarily focuses on the oxygen transport process in primary ceria-zirconia (CZ) particulates, which are heterogeneously agglomerated within spherical three-way catalyst particles as part of the reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

Modeling of CO Oxidation by Diffusion of Oxygen Atoms in Ceria-Zirconia Particulates in a Three-Way Catalyst Particle Membrane Filter

Koko,

Hanamura

2023

Preprint

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In order to design a novel high-porosity microporous membrane filter comprising Three-way Catalyst (TWC) particles with a size distribution of 1 to 2 microns, isothermal CO oxidation experiments and numerical simulations was conducted to investigate the transport of oxygen atoms within primary Ceria-Zirconia (CZ) particulates. These spherical TWC particles were fabricated through the agglomeration of primary CZ and alumina particulates, incorporating Pd and Rh catalysts. By comparing experimental CO2 emissions with simulation results over time, a temperature-dependent diffusion coefficient was determined. The simulation results reveal that within a temperature range of 175 to 225 °C, the effective distance of oxygen atom transport within CZ particulates, heterogeneously distributed in the spherical TWC particle, is limited to approximately 100 nm from the surface of agglomerated spherical TWC particles.

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“…Significant advances have been made in improving TWC performance, resulted in faster light off, higher conversion efficiency, and greater thermal durability. Besides, improvements in fuel quality and engine management led to tighter emissions standards being achievable, concomitant with reducing the cost by lowering precious metal loadings [13][14][15]. The Pt/Rh catalyst with single-layer wash coat has poor HC reduction under lean A/F operation, but if the two precious metals are separated by duel layers, the HC-reduction will be substantially improved.…”

Section: -Introductionmentioning

confidence: 99%

HC, CO and NOx emissions reduction efficiency of a prototype catalyst in gasoline bi-mode SI/HCCI engine

Hasan

Abu-Jrai

Al-Muhtaseb

et al. 2016

Journal of Environmental Chemical Engineering

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Numerical Simulation for Designing Next Generation TWC System with Detailed Chemistry

Cited by 10 publications

References 11 publications

A Simplified Three-Way Catalyst Model for Transient Hot-Mode Driving Cycles

A Simplified Three-Way Catalyst Model for Transient Hot-Mode Driving Cycles

Modeling of CO Oxidation by Diffusion of Oxygen Atoms in Ceria-Zirconia Particulates in a Three-Way Catalyst Particle Membrane Filter

HC, CO and NOx emissions reduction efficiency of a prototype catalyst in gasoline bi-mode SI/HCCI engine

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