Development of Low-Temperature Premixed Diesel Combustion Strategies and Formulation of Suitable Diesel Oxidation Catalysts
Omschrijving
The development of low-temperature premixed
compression ignition (PCI) combustion strategies and
the performance of diesel oxidation catalysts (DOC)
are presented in this work. At moderate loads,
low-temperature PCI combustion is shown to
significantly reduce engine-out oxides of nitrogen
(NOX) and soot emissions compared to a conventional
diesel combustion strategy. The PCI load-range is
limited by soot emissions at high engine loads and
excessive carbon monoxide (CO), hydrocarbon (HC)
emissions and low exhaust gas temperatures low engine
loads. DOC formulations are investigated on a gas
bench reactor using surrogate exhaust gas mixtures
containing CO, O2, H2O, C11H24, C2H4 and N2.
Light-off tests show delayed catalyst light-off in
the presence of PCI exhaust. CO and HC are converted
to 100% and 98% respectively under fully lit
conditions. Engine experiments agree well with
reactor experiments. DOC formulations containing
zeolites adsorb HC at low temperatures. HC speciation
shows that HCs of carbon number five and higher are
trapped on zeolite at low temperatures. CO conversion
is 100% through the fully active catalyst; HC
conversion is lower compared to the reactor experiments.
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