Journal
APPLIED THERMAL ENGINEERING
Volume 28, Issue 8-9, Pages 962-966Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2007.06.033
Keywords
diesel; emissions; HC; CO; oxidation catalyst; engine-out emissions; tail-pipe emissions; oxidation efficiency; close-coupled catalyst; EGR
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Different configurations were used to study the impact of a Diesel oxidation catalyst position on the HC and CO oxidation efficiency of a Euro4 Diesel passenger car. An oxidation catalyst of 0.8 L downstream EGR port is the original configuration. Another two configurations are studied in this work: the same catalytic volume put upstream EGR port and four small close-coupled catalysts of 0.06 L each put in the exhaust manifold very close to the engine exhaust valve. The results show that the configuration upstream EGR port leads to a significant increase on HC conversion efficiency; however, CO tail-pipe emissions remain practically unchanged. The four small close-coupled catalysts put in the exhaust manifold, despite the higher exhaust temperature, show lower oxidation efficiency due to the high space velocity, however, they can be used in the case of little available space for a bigger catalyst. In all configurations studied, there is a significant difference on CO and HC conversion efficiency and thus on tail-pipe emissions in the case of aged oxidation catalysts compared to fresh ones. (c) 2007 Elsevier Ltd. All rights reserved.
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