Optimizing coupled diesel oxidation catalyst and particulate filter for enhanced emission reduction

Diesel engines dominate non-road machinery applications but generate environmentally hazardous emissions, particularly nitrogen oxides and particulate matter. Therefore, investigations on the performance of an integrated diesel oxidation catalyst (DOC) and diesel particulate filter (DPF) system are conducted, focusing on the effects of critical parameters such as catalyst composition, oxygen content, exhaust velocity, and operating temperature. The results revealed that palladium (Pd) content in the catalyst enhances C3H6 conversion, with a 4.83% higher conversion rate compared to platinum (Pt) at an oxygen mass fraction of 0.04. An orthogonal test design is employed to identify the key factors influencing DOC+DPF conversion, with inlet velocity showing the greatest gray correlation with carbon particle conversion, followed by oxygen content, inlet temperature, and catalyst ratio. Additionally, NO oxidation efficiency peaked under moderate temperatures and increased with Pt catalyst content. This study indicates the importance of synergistic optimization of operating conditions, catalyst composition, and system parameters to enhance pollutant conversion efficiency. These findings establish quantitative relationships between operational variables and system performance, providing valuable insights for optimizing aftertreatment configurations in heavy-duty applications.