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As exhaust gas passes through the
converter, DOC oxidizes and purifies gaseous HC and CO, lube
oil of total particulate matter(TPM), and unburned fuel SOF
by taking advantage of the theory that catalyst and exhaust
react.
For gasoline engine, operating air-fuel ratio is close to theoretical
one, while diesel engine is operated in rarefied air, thus TWC
is not available. Therefore diesel engine is designed to most
remove HC, CO and SOF with diesel oxidation catalyst. |
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