Combined removal of diesel soot particulates and NOx over CeO2–ZrO2 mixed oxides

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Title: Combined removal of diesel soot particulates and NOx over CeO2–ZrO2 mixed oxides
Authors: Atribak, Idriss | Bueno López, Agustín | Garcia-Garcia, Avelina
Research Group/s: Materiales Carbonosos y Medioambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica
Keywords: Catalysed soot oxidation | Ceria | Ce-Zr mixed oxide | Solid solution | Soot | NOx | Diesel pollution control
Knowledge Area: Química Inorgánica
Issue Date: 1-Oct-2008
Publisher: Elsevier
Citation: ATRIBAK, Idriss; BUENO LÓPEZ, Agustín; GARCÍA GARCÍA, Avelina. "Combined removal of diesel soot particulates and NOx over CeO2–ZrO2 mixed oxides". Journal of Catalysis. Vol. 259, Issue 1 (1 Oct. 2008). ISSN 0021-9517, pp. 123-132
Abstract: CeO2 and Ce–Zr mixed oxides with different Ce:Zr ratios were prepared; characterised by Raman spectroscopy, XRD, TEM, N2 adsorption at −196 ◦C, and H2-TPR; and tested for soot oxidation under NOx/O2. Among the different mixed oxides, Ce0.76Zr0.24O2 provided the best results. Ce0.76Zr0.24O2 presented greater activity than pure CeO2 for soot oxidation by NOx/O2 when both catalysts were calcined at 500 ◦C (soot oxidation rates at 500 ◦C are 14.9 and 11.4 μgsoot/s, respectively), and the catalytic activity of CeO2 decayed significantly with calcination temperature (from 500 to 1000 ◦C), whereas Ce0.76Zr0.24O2 presented enhanced thermal stability at temperatures as high as 1000 ◦C. In addition, Ce0.76Zr0.24O2 catalysed the reduction of NOx by soot at around 500 ◦C more efficiently than CeO2, thereby contributing to the decreased NOx emission level. The catalytic activity of CeO2 and Ce0.76Zr0.24O2 for soot oxidation by NOx/O2 depended on the textural properties (BET area; crystallite size), but other properties of the oxides, such as redox behaviour and/or enhanced lattice oxygen mobility, also played a significant role.
Sponsor: Spanish Ministry of Education and Science (Project CTQ2005-01358) and the ABL contract funded by the Ramon y Cajal Program and the Generalitat Valenciana.
ISSN: 0021-9517
DOI: 10.1016/j.jcat.2008.07.016
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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Appears in Collections:INV - MCMA - Artículos de Revistas

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