Durability of NOx Absorbers: Effects of Repetitive Sulfur Loading and Desulfation EmeraChem LLC

Format:

Conference/Event

Author/Creator:

Parks, Jim, author.

Conference Name:

SAE Powertrain & Fluid Systems Conference & Exhibition (2002-10-21 : San Diego, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2002

Summary:

NOx absorber catalysts can obtain NOx reduction efficiencies greater than 90% in lean exhaust. Since upcoming U.S. EPA emission regulations for diesel engines will require high NOx reduction efficiencies, NOx absorber catalysts are under consideration for use in compliance. However, durability issues in diesel engine exhaust need to be addressed. Specifically, sulfur is a known masking agent in NOx absorber catalysis. One method of controlling sulfur masking is by removal of sulfur compounds from the catalyst in a reducing environment; this process is referred to as desulfation and typically occurs at elevated catalyst temperatures. Over the catalyst lifetime, many (100-1,000) sulfur loading and desulfation cycles may occur, and recovery during desulfation must be sufficient to meet the regulation. Here the effect of multiple repetitive sulfur loading and desulfation cycles on catalyst performance will be studied. The durability testing was performed with an accelerated rate of sulfur masking (150-ppm sulfur fuel). Projections of NOx performance over time will be made to predict catalyst lifetime

Notes:

Vendor supplied data

Publisher Number:

2002-01-2880

Access Restriction:

Restricted for use by site license