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Effect of NO on Catalytic Soot Oxidation in Tight Contact with $Pt/CeO_2$ Using a Flow Reactor System  

Lee, Dong-Il (Graduate School of Mechanical Engineering, Yonsei University)
Song, Chang-Hoon (Renault Samsung Motors Co.)
Song, Soon-Ho (Department of Mechanical Engineering, Yonsei University)
Chun, Kwang-Min (Department of Mechanical Engineering, Yonsei University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.19, no.3, 2011 , pp. 52-56 More about this Journal
Abstract
Active regeneration in CDPF requires $O_2$ which regenerates soot at high temperature. However, small amount of NO can interrupt $O_2$ regeneration in CDPF. To verify this phenomena, soot oxidation experiments using a flow reactor with a $Pr/CeO_2$ catalyst are carried out to simulate Catalyzed Diesel Particulate Filter (CDPF) phenomena. Catalytic soot oxidation with and without small amount of NO is conducted under tight contact condition. As the heating rate rises, the temperature gap of maximum reaction rate is increased between with and without 50ppm NO. To accelerate the $NO_2$ de-coupling effect, CTO process is performed to eliminate interfacial contact for that time. As CTO process is extended, temperature which indicates peak reaction rate increases. From this result, it is found that small amount of NO can affect tight contact soot oxidation by removal of interfacial contact between soot and catalyst.
Keywords
Temperature programmed oxidation; Constant temperature oxidation; Tight contact; $NO_2$ de-coupling;
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