Intra-Catalyst Reductant Chemistry and Nox Conversion of Diesel Lean Nox Traps at Various Stages of Sulfur Loading

摘要: Due to increasingly stringent emissions regulations, Lean NOX Trap (LNT) catalysts are being researched as a potential solution for diesel engine reduction. LNTs practical reduction due their ability reduce from the O2 rich environment produced by engines. function storing on catalyst surface during efficient lean operation then, under conditions, releasing and reducing trapped NOX. One method of producing this which regenerates LNT involves manipulating fuel injection parameters throttling air intake. This process is called in-cylinder regeneration. Experiments will be described here in 1.7 L common rail has been used regenerate at various stages sulfur exposure, known poison LNT. In-cylinder regeneration strategies were produce range reductant chemistries enabled study role reductants was converted across gives insight into how most efficiently Sulfur poisoning fresh accelerated via use bottled SO2. Regeneration studies states sulfation after desulfation discussed, highlighting intra-catalyst measurementsmore » chemistry conversion through catalyst. Results showed that loading increased, efficiency decreased utilization shifted downstream. Hydrogen combustion consumed over first half then other available last some conditions. production portion found affected sulfur.« less