Evaluating the performance of particle oxidation catalyst for construction equipment

The regeneration ability of diesel particulate filter (DPF) may not meet the immense power demand of construction equipment. Furthermore, few research addresses the emission control technologies for construction equipment. Therefore, this study aims to provide the potential application of diesel oxidation catalyst (DOC) and particle oxidation catalyst (POC) in terms of reducing PM, gaseous pollutants, and polycyclic aromatic hydro-carbons (PAHs) emitted from the exhaust of diesel engines without losing power. The results showed an absence of reaction on engine power when DOC + POC was installed due to the open-flow channel of the POC. Moreover, POC reduced the PM emissions by 92.4%-93.1% and for gaseous pollutants, CO was reduced by 87.2%-93.3% while HC showed 80.7%-100%. Against DPF, the PM filtration of the POC is lower however, the two Euro III diesel engines still met the Euro V standards for PM, CO, and HC. For new POC condition, a minimum of 80.9% PAH removal efficiency was shown by both engines, while lower percentages were displayed for the remaining conditions. Although, the data suggest that the POC utilized did not wane, but rather an incomplete combustion occurred which lowered the PAH removal efficiency of the other conditions. Nevertheless, the DOC + POC still managed a 33.0%-57.0% PAH mass reduction. Lastly, following the high-performance results of the engines, the same was seen on the excavator as 86.5-96.7% of PM were removed from the raw exhaust while testing its idle and action mode.

Automated summary

Diesel oxidation catalyst (DOC) and particle oxidation catalyst (POC) can effectively reduce pollutant emissions from diesel engine exhaust without losing power. The filtration efficiency of POC is lower than that of diesel particulate filter (DPF), but it still meets the relevant standards. However, there are limitations in reducing polycyclic aromatic hydro-carbons (PAHs) removal efficiency with POC.