Mechanisms of sulfur poisoning of NOx adsorber materials
EMSL Project ID
3446
Abstract
The program is in support of DOE?s FreedomCAR and Vehicle Technologies program.One of the most promising approaches to reduce NO in the presence of excess oxygen is based on the concept of NO storage-reduction (NSR), where the NO abatement reactor operated in a mixed lean/rich cycle. Catalysts used in the reactor have the function of both storage and oxidation/reduction. It has been established that supported Pt on Ba promoted alumina exhibiting promising activity. However, the activity of the catalysts was often suppressed by the presence of water and sulfur in the exhaust. In the current study, we proposed to examine the catalyst deactivation related to the presence of sulfur impurities in the exhaust using TEM, raman spectroscopy, XRD, and temperature programmed characterization techniques.
The overall tasks can be described as:
1) Characterization of Pt-Ba-Al2O3 samples in the absence and presence of Sox impurities in the feed.
2) Understanding the reaction mechanism and catalytic function of the alkali or alkaline earth metals and the noble metal in the oxidation/reduction cycle.
3) Mechanistic study of Pt-Ba-Al2O3 deactivation in the presence of Sox
Project Details
Project type
Exploratory Research
Start Date
2003-03-24
End Date
2006-03-26
Status
Closed
Released Data Link
Team
Principal Investigator