OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
FIG 11 HC contents in PROTON converter[7]
FIG 12 HC contents in FIAT converter[7]
Meanwhile, the amount of CO after the converter at the same speed maintains the highest level among all speeds
with a range between 2.0 to 2.5% by volume.
Fiat converter performed much better in oxidizing the CO with a lower range of overall percentage, i.e., around
0.5 to 2.0% before converter and 0.0 to 1.25% after the converter.
Experimental data show that the Fiat converter has higher air-fuel ratio (leaner mixture) compared to Proton
converter which results the lower concentration of CO because of greater presence of oxygen.
Unburned hydrocarbon contents at idling speed of 1000 rpm is much higher in Proton converter than in Fiat
converter, though the exhaust temperatures for both are similar.
The hydrocarbon oxidation is still weak even kept for 30 minutes while Fiat converter has performed a HC
decrease from the very beginning. It has maintained the HC level below 500 ppm for the three different speeds
after passing through the substrates and again, the air-fuel ratio is one of the factors contributing to those results.
For NOx reduction, both converters perform in similar way by putting the residual NO as low as 5 to 15 ppm.
Experimental studies suggest that by implementing a catalytic converter significant amount of reduction in
exhaust emissions are observed:
• Presence of CO in exhaust emission is reduced from 4-4-5% to 2-2-5% by volume.
• Presence of hydrocarbons is reduced from 3000ppm to 1100ppm.
• Presence of NO in exhaust emission came down to 50ppm from 400-450ppm.
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