Formation and Decomposition of Cerium-Based Nitrate Species
EMSL Project ID
35397
Abstract
We propose to study the effects of CO2 and H2O, two key diesel exhaust components, on the stability of nitrates bound to ceria on a Pt/Ce/Al2O3 catalyst. Commercial NOX storage/reduction (NSR) catalysts typically contain ceria as part of the formulation, in order to stabilize Pt but also due to its ability to store NOX at low temperatures. A detailed understanding of the equilibrium between surface nitrates, carbonates and hydroxide species, associated with both the ceria component and the support material is needed in order to successfully model the kinetics and performance of these samples. The study will include combining IR characterization of the catalyst surface, product gas analysis and temperature-programmed reaction techniques. The study will be based on pulsed-injections of the reactants and monitoring the surface and reactivity changes of the catalyst samples. We are requesting two, one week periods to perform the research described. This work will be disseminated in the open literature and is not proprietary.
Project Details
Project type
Large-Scale EMSL Research
Start Date
2009-10-05
End Date
2010-09-30
Status
Closed
Released Data Link
Team
Principal Investigator