Impact of a Cu-zeolite SCR Catalyst on the Performance of a Diesel LNT+SCR System
Date Published: 2009-04-20
Paper Number:2009-01-0285
DOI: 10.4271/2009-01-0285
Citation:
Xu, L., McCabe, R., Ruona, W., and Cavataio, G., "Impact of a Cu-zeolite SCR Catalyst on the Performance of a Diesel LNT+SCR System," SAE Technical Paper 2009-01-0285, 2009, doi:10.4271/2009-01-0285.
Advanced Cu-zeolite based SCR (selective catalytic reduction) catalyst technologies were evaluated in a laboratory reactor as a component of a diesel LNT (lean NOx trap) plus in-situ SCR system (i.e., NH
3
generation over the LNT vs injection via urea). New-generation LNT formulations, with lower desulfation temperatures and improved durability characteristics relative to previous LNTs, were also evaluated. The combined new-generation LNT+Cu-zeolite SCR systems showed a much wider temperature window of high NOx conversion compared to either LNT catalysts alone or LNT+SCR systems utilizing Fe-zeolite SCR catalysts. The new-generation Cu-zeolite SCR catalysts retained high activity even after repeated exposure to high-temperature rich DeSOx conditions in a laboratory 3-mode aging cycle simulating 120,000 mile vehicle driving.
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