The selective catalytic reduction of NO using urea (urea-SCR) is one of the promising technologies for removing NOx from diesel engine exhaust. The engine-out NOx is reduced by ammonia (NH3) derived from urea over a catalyst to environmentally benign N2. In this paper, we investigate the effect of various reactor operating conditions on the NOx reduction performance of three different catalyst formulations (e.g., Cu-zeolite, Fe-zeolite, Vanadium-based) to obtain useful guidance in the design and operation of urea-SCR lean NOx emission control systems. We examine the effects of NO:NO2 ratio on the steady-state NOx reduction activity at typical diesel engine exhaust temperatures (150-550°C). Transient measurements were also performed to determine the impact of NH3:NOx ratio and NH3 storage on catalyst performance. The impacts of hydrocarbon poisoning and sulfur poisoning/regeneration were also examined.
Evaluation of Supplier Catalyst Formulations for the Selective Catalytic Reduction of NOx With Ammonia
Sae Technical Papers
Powertrain & Fluid Systems Conference & Exhibition ; 2005
2005-10-24
Conference paper
English
Automotive engineering | 2005
|Observer-based estimation of selective catalytic reduction catalyst ammonia storage
Online Contents | 2010
|Observer-based estimation of selective catalytic reduction catalyst ammonia storage
Automotive engineering | 2010
|Observer-based estimation of selective catalytic reduction catalyst ammonia storage
SAGE Publications | 2010
|British Library Online Contents | 2011
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