O-W-Com-17 Understanding NH3 Formation over Lean NOx Trap (LNT) Catalysts: Effects of Lean/Rich Cycle Timing and Temperature

Wednesday, June 5, 2013: 5:00 PM
Combs Chandler (Galt House Hotel)
Christopher D. DiGiulio1, Josh A. Pihl2, Todd J. Toops2, Jae-Soon Choi2, Michael J. Lance2, James E. Parks II2 and Michael D. Amiridis1, (1)University of South Carolina, USA, (2)Oak Ridge National Laboratory, USA.
The impact of LNT lean/rich cycle timing and reductant concentration on NOx conversion and NH3/N2O/N2 was studied over a commercially-available catalyst.  Below 250°C, long rich times with low reductant concentrations were preferred; the opposite is true above 450°C.  NH3 yield peaks at 250°C (50%), but so does N2O yield (10%).

Extended Abstracts: