Improvements in Intimately Coupled Diesel Hydrocarbon Adsorber/Lean NOx Catalysis Leading to Durable Euro 3 Performance ASEC

Format:

Conference/Event

Author/Creator:

Kharas, K. C. C., author.

Conference Name:

International Fall Fuels & Lubricants Meeting & Exposition (1998-10-19 : San Francisco, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1998

Summary:

AbstractThe transition from Euro2 to Euro3 emission standards for passenger diesel vehicles requires very good hydrocarbon control coupled with moderate, passive NOx reduction. In some cases, CO and PM conversion is also required. Passive NOx reduction, that is, selective catalytic reduction of NOx by hydrocarbons without delivery of hydrocarbon specifically for this purpose, requires good management of a scarce hydrocarbon resource. At the same time, increased requirements for HC control demand that unconverted HC be further minimized. Appropriately designed lean NOx catalysts with hydrocarbon adsorber capabilities offer very good HC control with moderate NOx reduction performance when fresh. However, certain zeolite structures appear quite unstable under high temperature aging, yielding significant declines in aged NOx performance. Instabilities can be avoided through proper choice of molecular sieve structure and composition, together with suitable washcoat structure. Durable catalyst performance, exceeding Euro3 standards, will be shown, using a leased Euro:! vehicle

Notes:

Vendor supplied data

Publisher Number:

982603

Access Restriction:

Restricted for use by site license