Synergic effect of Cu/Ce0.5Pr0.5O2-δ and Ce0.5Pr0.5O2-δ in soot combustion

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Title: Synergic effect of Cu/Ce0.5Pr0.5O2-δ and Ce0.5Pr0.5O2-δ in soot combustion
Authors: Rico Pérez, Verónica | Aneggi, Eleonora | Bueno López, Agustín | Trovarelli, Alessandro
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: Soot oxidation | Ceria | Praseodymium oxide | NO oxidation | CeO2
Knowledge Area: Química Inorgánica
Issue Date: 15-Nov-2016
Publisher: Elsevier
Citation: Applied Catalysis B: Environmental. 2016, 197: 95-104. doi:10.1016/j.apcatb.2016.02.051
Abstract: A series of 5%Cu/Ce0.5Pr0.5O2-δ and Ce0.5Pr0.5O2-δ mixed oxides have been prepared and combined in different ratios. The resulting catalysts have been characterized by N2 adsorption, XRD, Raman spectroscopy and H2-TPR and tested for soot combustion by means of temperature-programmed experiments. The optimum catalyst for soot combustion in NOx/O2/N2 atmosphere is the mixture containing 40% Cu/Ce0.5Pr0.5O2-δ and 60% Ce0.5Pr0.5O2-δ. This mixture is more active than a reference catalyst containing the same amount of copper distributed in the whole Ce-Pr mixed oxide support. The benefit of mixing Ce0.5Pr0.5O2-δ particles with and without copper in a single catalyst formulation is that the participation of the two soot combustion mechanisms based on active oxygen and NO2, respectively, is optimized. The particles with copper mainly promote the catalytic oxidation of NO to NO2 (the NOx-assisted mechanism) while those without copper are more effective in promoting the active oxygen mechanism. If copper is loaded homogeneously in all the Ce0.5Pr0.5O2-δ particles, the positive effect of copper improving NO2 production is offset by the lower efficiency of the active oxygen mechanism, due to a lack of active oxygen on the Ce0.5Pr0.5O2-δ support.
Sponsor: The authors thank financial support from MIUR (Futuro in ricerca, FIRB 2012, project SOLYST), Regione Autonoma Friuli Venezia Giulia, Generalitat Valenciana (Project PROMETEOII/2014/010), Spanish Ministry of Economy and Competitiveness (Project CTQ2012-30703) and UE (FEDER funding).
URI: http://hdl.handle.net/10045/57258
ISSN: 0926-3373 (Print) | 1873-3883 (Online)
DOI: 10.1016/j.apcatb.2016.02.051
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier B.V.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.apcatb.2016.02.051
Appears in Collections:INV - MCMA - Artículos de Revistas

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