Role of particle oxidation catalyst on emission reduction of a non-road diesel engine: A multi case study

Abstract

Non-road diesel engine emissions present a serious hazard to both users and the environment. Despite several research on the emission control of non-road diesel engines, the role of particle oxidation catalysts (POC) in emission reduction is still not fully understood. Therefore, the current study investigates this factor during transient operation. The emissions of three modes, POC1 (symmetric layout and plugging channel), POC2 (asymmetric layout and unplugging channel), and POC3 (asymmetric layout and plugging channel), were tested and compared to the original emissions. The experimental results show that the conversion efficiencies of the POC1–POC3 systems for particulate matter (PM) were 33 %, 53 %, and 61 %, respectively. The asymmetrical channel layout can increase the PM conversion efficiency by 28 % compared with the symmetrical channel layout, and the plugging structure can increase the PM conversion efficiency by 8 %. The conversion efficiency of nitrogen oxides (NOx) is above 87 %, and the asymmetric channel layout can increase it by 8 %. However, the plugging structure has almost no effect on the conversion of NOx when compared to the results for POC2 and POC3. HC and CO emissions were very low in all cases. Overall, only POC3 met the CHINA IV emission standards for non-road diesel engines, and the detailed process is discussed in this paper. The current study can help with after-treatment layout for non-road diesel engines.