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The Effects Of Ceria Addition On Aging And Sulfation Of Lean Nox Traps For Stand Alone And Lnt-Scr Applications, Vencon G. Easterling
The Effects Of Ceria Addition On Aging And Sulfation Of Lean Nox Traps For Stand Alone And Lnt-Scr Applications, Vencon G. Easterling
Theses and Dissertations--Chemical and Materials Engineering
THE EFFECTS OF CERIA ADDITION ON AGING AND SULFATION OF LEAN NOx TRAPS FOR STAND ALONE AND LNT-SCR APPLICATIONS
Model powder and fully formulated monolithic lean NOx trap (LNT) catalysts were used to investigate the effect of ceria on desulfation behavior. Temperature-programmed reduction (TPR) experiments (model catalysts) showed each of the oxide phases present is able to store sulfur and possesses distinct behavior (temperature at which desulfation occurs). La-CeO2 or CeO2-ZrO2-containing samples (monoliths) showed a greater resistance to deactivation during sulfation and required lower temperatures to restore the NOx storage efficiency to …