(a) NO oxidation NO + O2?NO2
Between 18% and 100% engine load, significant conversion of
NO to NO2 was observed, with a maximum at 25% load. As the
engine load also affects the combustion temperature and therefore
the gas outlet temperature, and as this is the only means of heating
the catalyst, it follows that the variations in NO oxidation activity
are linked to changes in the catalyst temperature. The activity profile,
that is, the volcano shape curve (NO2 production in Fig. 6a and
b), is in line with what has been reported in the scientific literature
for NO oxidation over Pt/Al2O3 catalysts [30,35]. However, the NO2
dissociation equilibrium does not appear to limits the yield of the
desired product since at engine load of 25%, the gas/catalyst temperature
is 335 C, which is notably lower than 450–500 C where
such limitation occurs [35].
(a) NO oxidation NO + O2?NO2Between 18% and 100% engine load, significant conversion ofNO to NO2 was observed, with a maximum at 25% load. As theengine load also affects the combustion temperature and thereforethe gas outlet temperature, and as this is the only means of heatingthe catalyst, it follows that the variations in NO oxidation activityare linked to changes in the catalyst temperature. The activity profile,that is, the volcano shape curve (NO2 production in Fig. 6a andb), is in line with what has been reported in the scientific literaturefor NO oxidation over Pt/Al2O3 catalysts [30,35]. However, the NO2dissociation equilibrium does not appear to limits the yield of thedesired product since at engine load of 25%, the gas/catalyst temperatureis 335 C, which is notably lower than 450–500 C wheresuch limitation occurs [35].
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