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

Format:

Book

Conference/Event

Author/Creator:

Koebel, M. (Manfred), author.

Conference Name:

SAE International Fall Fuels & Lubricants Meeting & Exhibition (2001-09-24 : San Antonio, Texas, United States)

Spring Fuels & Lubricants Meeting & Exhibition (2002-05-06 : Reno, Nevada, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2001

Summary:

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

Notes:

Vendor supplied data

Publisher Number:

2001-01-3625

Access Restriction:

Restricted for use by site license