NOx storage and reduction over copper-based catalysts. Part 2: Ce0.8M0.2Oδ supports (M = Zr, La, Ce, Pr or Nd)

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Title: NOx storage and reduction over copper-based catalysts. Part 2: Ce0.8M0.2Oδ supports (M = Zr, La, Ce, Pr or Nd)
Authors: Bueno López, Agustín | Lozano Castelló, Dolores | Anderson, James A.
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: NSR | deNOx | Diesel aftertreatment | Copper catalyst | Ceria | DRIFTS | Operando
Knowledge Area: Química Inorgánica
Issue Date: 5-Dec-2016
Publisher: Elsevier
Citation: Applied Catalysis B: Environmental. 2016, 198: 234-242. doi:10.1016/j.apcatb.2016.05.066
Abstract: 5% copper catalysts with Ce0.8M0.2Oδ supports (M = Zr, La, Ce, Pr or Nd) have been studied by rapid-scan operando DRIFTS for NOx Storage and Reduction (NSR) with high frequency (30 s) CO, H2 and 50%CO + 50%H2 micropulses. In the absence of reductant pulses, below 200–250 °C NOx was stored on the catalysts as nitrite and nitro groups, and above this temperature nitrates were the main species identified. The thermal stability of the NOx species stored on the catalysts depended on the acid/basic character of the dopant (M more acidic = NOx stored less stable ⇒ Zr4+ < none < Nd3+ < Pr3+ < La3+ ⇐ M more basic = NOx stored more stable). Catalysts regeneration was more efficient with H2 than with CO, and the CO + H2 mixture presented an intermediate behavior, but with smaller differences among the series of catalyst than observed using CO alone. N2 is the main NOx reduction product upon H2 regeneration. The highest NOx removal in NSR experiments performed at 400 °C with CO + H2 pulses was achieved with the catalyst with the most basic dopant (CuO/Ce0.8La0.2Oδ) while the poorest performing catalyst was that with the most acidic dopant (CuO/Ce0.8Zr0.2Oδ). The poor performance of CuO/Ce0.8Zr0.2Oδ in NSR experiments with CO pulses was attributed to its lower oxidation capacity compared to the other catalysts.
Sponsor: The authors thank the financial support of Generalitat Valenciana (Project PROMETEOII/2014/010 and grant BEST/2014/250),the Spanish Ministry of Economy and Competitiveness (ProjectsCTQ2015-67597-C2-2-R, MAT2014-61992-EXP, and grantPRX14/00249), and the UE (FEDER funding).
URI: http://hdl.handle.net/10045/56034
ISSN: 0926-3373 (Print) | 1873-3883 (Online)
DOI: 10.1016/j.apcatb.2016.05.066
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Published by Elsevier B.V.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.apcatb.2016.05.066
Appears in Collections:INV - MCMA - Artículos de Revistas

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