Systems and methods for increasing nitrogen dioxide fraction in exhaust gas at low temperature
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United States of America Patent
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Jul 17, 2018
Grant Date -
Feb 1, 2018
app pub date -
Jul 28, 2017
filing date -
Jul 29, 2016
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Abstract
An aftertreatment system includes a first oxidation catalyst, a second oxidation catalyst, and a turbocharger. The first oxidation catalyst is upstream of the turbocharger and includes a first oxidation catalyst formulation. The second oxidation catalyst is downstream of the turbocharger and includes a second oxidation catalyst formulation different than the first oxidation catalyst formulation. The second oxidation catalyst formulation is configured to promote conversion of nitric oxide (NO) to nitrogen dioxide (NO2).
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