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Car exhaust shall go through
reduction to convert NOx into N2. Since Lem(excessive
oxygen) condition and Rich(fuel process) condition are
repeated as operating conditions of the engine, NOx purification
effect of high efficiency can be hardly obtained just
by TWC. Therefore a unit to effectively reduce NOx by
coating NOx reserve substance on TWC was developed. The
engine adsorbs NO in NOx reserve substance under Lean
condition, NO is converted into NO2 in Rich mode, and
then reacted with Rh into N2 and CO2. |
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