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Perovskite-Based Catalysts as Efficient, Durable, and Economical NOx Storage and Reduction Systems
Open AccessArticle

Hybrid Technology for DeNOxing by LNT-SCR System for Efficient Diesel Emission Control: Influence of Operation Parameters in H2O + CO2 Atmosphere

Departamento de Ingeniería Química, Facultad de Ciencias, Campus de Teatinos, Universidad de Málaga, E-29071 Málaga, Spain
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Catalysts 2020, 10(2), 228; https://doi.org/10.3390/catal10020228
Received: 17 January 2020 / Revised: 6 February 2020 / Accepted: 11 February 2020 / Published: 14 February 2020
The behavior and operation parameters were analyzed for the hybrid LNT-SCR (Lean NOx-Trap–Selective Catalytic Reduction) system with advanced catalyst formulations. Pt-Ba-K/Al2O3 was used as an NSR (NOx Storage and Reduction) or LNT catalyst effective in NOx and soot simultaneous removal whereas Cu-SAPO-34 with 2 wt.% of copper inside the structure was the small pore zeolite employed as the SCR catalyst. Under alternating and cyclic wet conditions, feeding volumetric concentrations of 1000 ppm of NO, 3% of O2, 1.5% of water, 0.3% of CO2, and H2 as a reductant, the NOx-conversion values were above 95% and a complete mineralization to nitrogen was registered using θ ≤ 3 (20 s of regeneration) and a hydrogen content between 10,000 and 2000 ppm in the whole temperature range tested. An excess of hydrogen fed (above 1% v/v) during the rich phase is unnecessary. In addition, in the low temperature range below 250 °C, the effect is more noticeable due to the further ammonia production and its possible slip. These results open the way to the scale up of the coupled catalytic technologies for its use in real conditions while controlling the influence of the operation map. View Full-Text
Keywords: NSR-SCR hybrid catalysts; coupled aftertreatment technologies; DeNOxing; fixed double bed; NOx emission control NSR-SCR hybrid catalysts; coupled aftertreatment technologies; DeNOxing; fixed double bed; NOx emission control
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Cortés-Reyes, M.; Herrera, C.; Larrubia, M.Á.; Alemany, L.J. Hybrid Technology for DeNOxing by LNT-SCR System for Efficient Diesel Emission Control: Influence of Operation Parameters in H2O + CO2 Atmosphere. Catalysts 2020, 10, 228.

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