Investigation of Ba-based NOx storage-reduction catalyst by Raman spectrometer (PNNL Title: Mechanisms of sulfur poisoning of NOx adsorber materials, Scope # 43315).
EMSL Project ID
7599
Abstract
NOx storage-reduction (NSR) catalysts are used in engines operating alternatively under lean and rich conditions to reduce the fuel consumption of vehicles. Typical NSR catalysts consists of a NOx storage compound, such as Barium oxide and a noble metal (Pt). Over the Pt catalyst, NO is converted to NO2, which results in the formation of nitrate species in Ba oxides. However, the detailed mechanism of nitrate formation and desorption over barium species is not fully understood. Raman spectroscopy has good capability to differentiate the various adsorbed species on the catalyst, such as nitrate, nitrite, sulfate, carbonate. Hence, application of Raman spectrometer to the barium based NSR catalyst will be valuable.
Project Details
Project type
Exploratory Research
Start Date
2004-02-16
End Date
2005-02-17
Status
Closed
Released Data Link
Team
Principal Investigator