SCR AFTER-TREATMENT OF ENGINE EXHAUST GAS
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United States of America Patent
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Issued Date -
Aug 17, 2017
app pub date -
Oct 20, 2016
filing date -
Feb 17, 2016
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Abstract
Reductant is metered into an engine exhaust gas after-treatment system upstream of an SCR catalyst at engine exhaust gas temperatures both less than and greater than a DEF dosing threshold temperature to render the catalyst effective in reducing NOx without creating undesired reaction products which would impair effectiveness of the after-treatment system at engine exhaust gas temperatures less than the DEF dosing threshold temperature.
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