Recent Advances in the Development of Urea-SCR for Automotive Applications

2001-01-3625

09/24/2001

Event
Spring Fuels & Lubricants Meeting & Exhibition
Authors Abstract
Content
In the recent years, considerable progress has been achieved in the development of urea-SCR for nonstationary, mobile applications. Main challenges are the reduction of the catalyst volumes and the optimization of the dosing strategy to minimize transient ammonia emissions during load changes. Catalysts with increased cell density and enhanced intrinsic activity are one way to obtain smaller catalyst volumes. Another approach is the introduction of additional catalysts upstream and downstream of the SCR catalyst itself. Most effective is an oxidizing precatalyst that converts a part of NO to NO2, thus allowing a faster SCR reaction to occur. However, such a system requires the use of fuel with reduced sulfur content.
Work performed at the Paul Scherrer Institute comprises of fundamental experiments in a laboratory scale reactor with synthetic exhaust gas and applied experiments on a diesel test stand. In addition to the evaluation of various commercial and proprietary catalysts, important problems of the process have been investigated as, for example, the fast SCR reaction, ammonia adsorption on the catalysts, the decomposition of urea, and catalyst aging.
Meta TagsDetails
DOI
https://doi.org/10.4271/2001-01-3625
Pages
12
Citation
Koebel, M., Elsener, M., and Madia, G., "Recent Advances in the Development of Urea-SCR for Automotive Applications," SAE Technical Paper 2001-01-3625, 2001, https://doi.org/10.4271/2001-01-3625.
Additional Details
Publisher
Published
Sep 24, 2001
Product Code
2001-01-3625
Content Type
Technical Paper
Language
English