Amminex City-SCR upgrade delivers gaseous ammonia for improved SCR conversion of NOx; avoiding high off-cycle emissions
Green Car Congress
MAY 16, 2014
The technical reason for these high “off-cycle” NO x emissions is poor NO x conversion efficiency of installed SCR systems when exhaust temperature is low. Urea-driven SCR system use exhaust heat to convert the urea solution to ammonia, which then reduces the NO x. At low exhaust temperatures, catalyst activity also falls off sharply.
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