Numerical Approach for Improving the Conversion Characteristics of Exhaust Catalysts Under Warming-Up Condition

Baba, Naoki; Ohsawa, Katsuyuki; Sugiura, Shigeki

doi:10.4271/962076

Cited by 41 publications

(32 citation statements)

References 11 publications

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“…Various numerical models with different complexity were developed. Baba et al (1996), Chatterjee et al (2002), Tischer et al (2003) and Jahn et al (1997) simulated the transient behavior of the entire monolithic converter. Other authors assume that, under certain operating conditions, all channels behave essentially alike and analyze a single channel.…”

Section: Introductionmentioning

confidence: 98%

Modeling of transport and chemistry in channel flows of automotive catalytic converters

Mladenov¹,

Koop²,

Tischer³

et al. 2010

Chemical Engineering Science

112

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Section: Introductionmentioning

confidence: 98%

Modeling of transport and chemistry in channel flows of automotive catalytic converters

Mladenov¹,

Koop²,

Tischer³

et al. 2010

Chemical Engineering Science

112

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“…It may be noted that there are many alternate but similar definitions of light-off in the literature [38][39][40][41][42][43] -one of the commonly used ones refers to light-off as the temperature condition required to achieve 50% conversion although we do not use this definition in the current work. Light-off in this work assumes or implies that a plot of the steady-state (bifurcation) diagram of solid temperature (or gas phase exit conversion or temperature) as a function of the inlet gas temperature exhibits a generalized S-shaped behavior in which the ignition or light-off point is represented by the normal limit point in the feasible region.…”

Section: Light-off Locationmentioning

confidence: 99%

Light‐off location and front diffusion in a catalytic monolith reactor

Ramanathan

Gopinath

2008

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).A one-dimensional solid-gas model has been used to study the light-off behavior in a reactor system. Techniques from nonlinear analysis are applied to first arrive at an analytical expression to estimate the light-off location in the reactor. The model is then extended to estimate the thickening of the light-off front in the vicinity of the light-off location due to heat diffusion effects in the solid substrate. Both these results are expressed in terms of all the important operating and design variables of the monolith reactor and also the reaction specific variables such as the kinetic parameters and heats of reaction. A specific case of a three-way catalyst (TWC) is numerically treated in detail to illustrate the application of this work. Finally, we focus on using the insight obtained from this study to suggest design guidelines to optimize the performance of automotive catalytic monolith reactors.

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“…Nu ：Nusselt number Sh ：Sherwood number λ g ：mean heat conductivity of reformed gas (8) , J/(m･s･K) D i ：mutual diffusion coefficient between species i and steam (9) , m 2 /s d ：hydraulic diameter of honeycomb cell, m ∆z ：axial distance from the front edge of honeycomb catalyst, m…”

Section: ･S)mentioning

confidence: 99%

Numerical Study on Honeycomb Type Methanol Steam Reformer

Yamamoto

Nagano

Asano

et al. 2008

JEE

Self Cite

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Experimental and numerical analysis of methanol steam reforming for a fuel cell have been carried out. The reforming catalyst is supported by metal honeycomb to decrease the heat capacity. Conversion performances are improved by segmenting the honeycomb catalyst into several blocks due to the enhancement of mixing of gases and heat transfer at the front edges of segmenting catalyst. Numerical simulation model for methanol steam reforming is developed by changing chemical reactions in the model for exhaust catalyst of internal combustion engines and using a smaller mass transfer coefficient for methanol steam reforming. The calculated results for a plate type methanol steam reformer which generates hydrogen of 7 kW (LHV) are also in good agreement with the measurements. The pattern of heat supply to catalysts and the reformer configuration affect conversion performances. It is predicted that the optimized methanol steam reformer for a 50 kW size fuel cell vehicle has a sufficient compactness.

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Numerical Approach for Improving the Conversion Characteristics of Exhaust Catalysts Under Warming-Up Condition

Cited by 41 publications

References 11 publications

Modeling of transport and chemistry in channel flows of automotive catalytic converters

Modeling of transport and chemistry in channel flows of automotive catalytic converters

Light‐off location and front diffusion in a catalytic monolith reactor

Numerical Study on Honeycomb Type Methanol Steam Reformer

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