Abstract
Diesel particulates are deposited in the diesel particulate filter and removed by the regeneration process. The Printex-U (PU) particles are simulated as the diesel soot to investigate the influence of thermal aging conditions on soot combustion performance with the addition of catalysts. The comprehensive combustion index S, combustion stability index Rw and peak temperature Tp are obtained to evaluate the combustion performance. Compared with the PU/Pt mixtures of different Pt contents (2 g/ft3, 3.5 g/ft3, and 5 g/ft3), the 10 g/ft3 Pt contents improve soot combustion with the outstanding oxygen absorption ability. When the weight ratio of PU/Pt mixture is 1:1, the promoted effect achieves the maximum degree. The S and Rw increase to 8.90 × 10−8 %2min−2°C−3 and 39.11 × 105, respectively, compared with pure PU. After the thermal aging process, the PU/Pt mixture with a 350 °C aging temperature for 10 h promotes the soot combustion the best when compared to pure PU particles. It is not good as the PU/Pt mixture without aging, because the inner properties of soot and Pt/Al2O3 catalyst may have been changed. The S and Rw are 9.07 × 10−8 %2min−2°C−3 and 38.39 × 105, respectively, which are close to the no aging mixture. This work plays a crucial role in understanding the mechanism of the comprehensive effect of soot and catalyst on soot combustion after the thermal aging process.
Highlights
Diesel engines have found an increasingly wide utilization in the field of industry because of their high thermal efficiency and preferable engine performance [1]
When particulate matter (PM) is deposited in the channel of the diesel particulate filter (DPF), the physical and chemical properties of complicated compositions will be transformed under the action of thermal aging temperature exhaust gas [17,18], which makes the oxidation reaction characteristics of deposited soot more complex [19]
The catalytic activity of soot oxidation is affected by two factors, including the contact bustion stability of PU/Pt mixtures decreases
Summary
Diesel engines have found an increasingly wide utilization in the field of industry because of their high thermal efficiency and preferable engine performance [1]. The government has formulated a series of extremely stringent emission standards to direct against the emission problem. This problem caused by diesel engines is harmful to human health and the environment [3,4]. A wall-flow diesel particulate filter (DPF) can dispose of those emission problems efficiently [5]. The regeneration process is not a transient process [13], and the exhaust temperature of the diesel engine is usually between 180 ◦ C to 400 ◦ C [14,15] so that the PM in DPF cannot be removed and oxidized immediately [16]. The oxidation performance of soot/catalyst mixtures after thermal aging process are studied by thermogravimetric analysis and kinetic analysis
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