Abstract
To reduce diesel emissions while permitting the passive regeneration of the diesel particulate filter (DPF) at low temperatures, we developed three after-treatment DPF devices. These devices consisted of a ceramic body that was either bare or loaded with the catalysts CeO2 (DPF-CeO2) or Ce0.5Mn0.5O2 (DPF-Ce0.5Mn0.5O2). The effects of these units on soot, NOx, CO, and hydrocarbon emissions were assessed. On average, the DPF-Ce0.5Mn0.5O2 device outperformed the DPF-CeO2 device. In addition, increasing the engine load was found to raise the exhaust temperature while increasing the soot oxidation efficiency and reducing soot emissions. The maximum soot removal percentages of the DPF-CeO2 and DPF-Ce0.5Mn0.5O2 were 37.6% and 55.1%, respectively, under B100 working conditions. The extent of NOx removal also gradually increased as the load increased, and the average removal percentages were 8.6% and 15.0%, respectively. Both catalytic devices lowered CO emissions to a much greater extent than the bare DPF, with average removals of 45.8% and 55.6%, respectively, while the average hydrocarbon oxidation values were 39.1% and 50.9%, respectively. Notably, the hydrocarbon emissions were almost zero after Ce1-xMnxO2 catalysis under C100 working conditions.
Highlights
The primary harmful emissions from diesel engines are particulate matter (PM) and NOx, for which there is a trade-off relationship such that both cannot be decreased using internal purification methods alone.[1,2,3,4] diesel emissions control technology has become an important field of research
The passive regeneration technologies developed to date have employed chemical catalysis to reduce the activation energy associated with the oxidation of particulates, lowering the PM ignition temperature such that the particulates can be oxidized at the temperature
Trials were performed using the same engine conditions with the various diesel particulate filter (DPF) permutations to compare the effects of the different catalysts
Summary
The primary harmful emissions from diesel engines are particulate matter (PM) and NOx, for which there is a trade-off relationship such that both cannot be decreased using internal purification methods alone.[1,2,3,4] diesel emissions control technology has become an important field of research. The soot, NOx, HC, and CO emissions obtained with each of these systems were determined under the ESC13 working conditions and compared to explore the effects of the catalysts on pollutant removal.
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