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• W2176534209 abstract "Abstract Combined NO x storage and reduction (NSR) and selective catalytic reduction (SCR) were conducted in a bench flow reactor comprising a Pt/Rh/BaO/Al 2 O 3 lean NO x trap (LNT) catalyst and either Fe-ZSM-5 or Cu-SSZ-13 SCR catalyst. Simulated exhaust gas containing C 3 H 6 or CO reductant was used to evaluate catalyst performance in terms of cycle-averaged NO x conversion and product selectivities over a range of feed concentrations and temperatures, and gas hourly space velocities (GHSV). Instantaneous concentration and temperature measurements reveal strong coupling of mass and energy between the LNT and SCR. The data show the importance of NH 3 generation by the LNT for effective use of the downstream SCR. Operating conditions are identified that maximize utilization of the downstream SCR. A non-NH 3 SCR pathway is found to be significant for Cu-SSZ-13 at intermediate temperature and high space velocity. The post-LNT NH 3 to NO x ratio (ANR) correlates with the incremental NO x conversion achieved for Fe-ZSM-5, noting that ANR ∼1 favors NH 3 -based standard SCR at high conversion. A reactor system productivity metric for N 2 generation (space-time yield analog) is used to rank-order the LNT + SCR systems and together with the propylene conversion are used to identify conditions giving the best performance. The combination of an overall GHSV of 135 k h −1 and 350 °C feed temperature generates a SCR feed from the LNT that results in the highest incremental cycle-averaged NO x conversion in the SCR (∼30% with Cu-SSZ-13) and high cycle-averaged conversions of NO x (∼90%) and propylene (∼80%). The Cu-SSZ-13 out-performs the Fe-ZSM-5 catalyst under most conditions." @default.
• W2176534209 created "2016-06-24" @default.
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• W2176534209 date "2016-05-01" @default.
• W2176534209 modified "2023-10-14" @default.
• W2176534209 title "Towards optimal operation of sequential NO storage and reduction and selective catalytic reduction" @default.
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• W2176534209 doi "https://doi.org/10.1016/j.apcatb.2015.11.029" @default.
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