Laboratory and Vehicle Demonstration of “2nd-Generation” LNT + in-situ SCR Diesel NOx Emission Control Systems 2010-01-0305
This study extends research previously reported from our laboratory [SAE 2009-01-0285] on diesel NOx control utilizing a new generation of Lean NOx Trap (LNT) plus in-situ Selective Catalytic Reduction (SCR) catalyst systems. Key findings from this work include 1) evidence for a “non-ammonia” reduction pathway over the SCR catalyst (in addition to the conventional ammonia pathway), 2) high NOx conversions utilizing LNT formulations with substantially lower platinum group metal (PGM) loadings than utilized in earlier systems, 3) ability of the downstream SCR catalyst to maintain high overall system NOx efficiency with aged LNTs, and 4) effectiveness of both Cu- and Fe-zeolite SCR formulations to enhance overall system NOx efficiency. FTP NOx conversion efficiencies in excess of 95% were obtained on two light-duty vehicle platforms with lab-aged catalyst systems, thus showing potential of the LNT+SCR approach for achieving the lowest U.S. emissions standards
Citation: Xu, L., McCabe, R., Dearth, M., and Ruona, W., "Laboratory and Vehicle Demonstration of “2nd-Generation” LNT + in-situ SCR Diesel NOx Emission Control Systems," SAE Int. J. Fuels Lubr. 3(1):37-49, 2010, https://doi.org/10.4271/2010-01-0305. Download Citation
Lifeng Xu, Robert McCabe, Mark Dearth, William Ruona
Ford Motor Co.
SAE 2010 World Congress & Exhibition
Diesel Exhaust Emission Control, 2010-SP-2287, SAE International Journal of Fuels and Lubricants-V119-4, SAE International Journal of Fuels and Lubricants-V119-4EJ