Comparative Analysis of NOx Emission Reduction in Engines Using NiCo₂O₄ Nanoparticles without External Reductant at Low Temperatures: An Experimental Investigation

Table 4

Petrol engine reading without using SCR catalyst.

Without SCR catalyst
Load (kg)	Exhaust temperature (°C)	NOx (ppm)	HC (ppm)	CO (ppm)	CO2 (ppm)
0	253	1	5	0.04	13.52
4	296	2	5	0.15	14.01
8	333	5	36	0.15	14.05
12	354	13	25	0.13	14.07
16	430	25	12	0.32	14.39