Effect of Ceria on the Sulfation and Desulfation Characteristics of a Model Lean NOx Trap Catalyst
- University of Kentucky
- ORNL
The effect of ceria addition on the sulfation and desulfation characteristics of a model Ba-based lean NO{sub x} trap (LNT) catalyst was studied. According to DRIFTS and NO{sub x} storage capacity measurements, ceria is able to store sulfur during catalyst exposure to SO{sub 2}, thereby helping to limit sulfation of the main (Ba) NO{sub x} storage phase and maintain NO{sub x} storage capacity. Temperature programmed desulfation experiments revealed that desulfation of a model ceria-containing catalyst occurred in two stages, corresponding to sulfur elimination from the ceria phase at {approx}450 C, followed by sulfur loss from the Ba phase at {approx}650 C. Significantly, the ceria-containing catalyst displayed relatively lower sulfur evolution from the Ba phase than its non-ceria analog, confirming that the presence of ceria lessened the degree of sulfur accumulation on the Ba phase.
- Research Organization:
- Oak Ridge National Laboratory (ORNL); Fuels, Engines and Emissions Research Center
- Sponsoring Organization:
- ME USDOE - Office of Management, Budget, and Evaluation; ORNL work for others
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 961560
- Journal Information:
- Catalysis Letters, Journal Name: Catalysis Letters Journal Issue: 1-2 Vol. 127; ISSN CALEER; ISSN 1011-372X
- Country of Publication:
- United States
- Language:
- English
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