A Guard System to Limit Catalytic Converter Temperature

Mondt, J. R.

doi:10.4271/760320

Cited by 4 publications

(1 citation statement)

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“…Our simulation results suggest that similar phenomena can also occur in monolithic reactors when the reactant concentrations in the feed are sufficiently high and the feedstream temperature is rapidly decreased. It has been observed (Mondt, 1976(Mondt, , 1981 that similar operating conditions (high unburned hydrocarbon concentration and decreasing exhaust temperature) are encountered during sudden vehicle deceleration or prolonged high-speed, closed-throttle coasts. Our model predicts, for a step decrease in the exhaust temperature, a substantial transient temperature rise in the solid phase of the monolithic converter under certain conditions; however, the predicted temperature rise was found to be too small to cause monolith melting, in accordance with a recent experimental observation (Mondt, 1981).…”

Section: Introductionmentioning

confidence: 97%

Transients of monolithic catalytic converters. Response to step changes in feedstream temperature as related to controlling automobile emissions

Oh¹,

Cavendish²

1982

Ind. Eng. Chem. Prod. Res. Dev.

346

191

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The transient behavior of automobile monolithic converters has been studied using a mathematical model which accounts for the simultaneous processes of heat transfer, mass transfer, and chemical reaction. The monolith response to a step increase in the feedstream temperature was examined as a function of catalyst design parameters and operating conditions In order to analyze their effects on the lightoff behavior of monolithic catalysts. Also, our simulation results showed that a step decrease In the feedstream temperature can lead to a somewhat unexpected transient temperature rise in the solid phase (that is, the catalytic wall) above its initial temperature, provided that the reactant concentrations in the feedstream are sufficiently high. This phenomenon is similar to the "wrong-way" behavior In packed-bed reactors previously reported in the literature.

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Section: Introductionmentioning

confidence: 97%