The
purpose of this study was to investigate hydrocarbon emissions
from the in-cylinder post-injection effect on NO oxidation over a
diesel oxidation catalyst (DOC) with various feed mixtures. In the
temperature ramp experiments with varying C3H6 concentrations in NO/O2 and NO/O2/H2 mixtures, addition of C3H6 was observed to
inhibit NO oxidation by delaying the ignition temperature of NO. Furthermore,
NO2 production was decreased with an increase in the feed
C3H6 concentration. NO was able to reduce platinum
oxide and produce NO2 at 200 °C. Experimental results
with C3H6 switching in/out at 350 °C indicated
that the introduction of 1.1% C3H6 clearly increased
the catalyst temperature and decreased the NO2 field. Feeding
in H2 led to a higher NO2 field and a lower
NO2 field drop. The decline in the NO2 concentration
can be attributed to platinum passivation caused by H2 in
the NO/O2/H2 mixture.
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