Tutorials Manual
Tutorials Manual
Tutorials Manual
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Chapter 3: Catalytic Processes<br />
<strong>Tutorials</strong> <strong>Manual</strong><br />
exit flow. At certain times the calculated conversion rates for CO and NO actually go<br />
negative. This results from the fact that CO and NO can be formed on the surface and<br />
thus can be “produced” as the state of the surface changes. Figure 3-15 shows inlet<br />
and exit gas temperatures as a function of time. Temperatures show that the gas<br />
heats up relative to the inlet gas due to exothermic surface reactions. The catalyst<br />
does not become effective until it reaches a temperature above about 600 K, which is<br />
consistent with the work by Chatterjee et al. 29<br />
Figure 3-13<br />
Engine Exhaust Aftertreatment—Molar Conversion Rates<br />
Figure 3-14<br />
Engine Exhaust Aftertreatment—Mole Fractions<br />
29. D. Chatterjee, O. Deutschmann and J. Warnatz, “Detailed Surface Reaction Mechanism<br />
in a Three-way Catalyst,” Faraday Discussions, 119:371-384 (2001).<br />
RD0411-C20-000-001 107 © 2007 Reaction Design
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