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Behavior of different soot combustion catalysts under NOx/O2. Importance of the catalyst–soot contact

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Abstract

Four different catalysts (Pt/Al2O3, Ce0.8Zr0.2O2, PrO2−x and SrTiCuO3) have been investigated on a laboratory scale to evaluate their potential as diesel soot combustion catalysts under different experimental conditions, which simulate the situation found in a continuous regeneration technology trap (dual-bed configuration of catalyst and soot) or a catalyst-coated filter system (single-bed configuration, both catalyst and soot particles mixed under loose-contact mode). Under dual-bed configuration, the behavior of the catalysts towards soot combustion are very similar, despite the differences observed in the NO2 production profiles. However, under single-bed configuration, there are important differences in the soot combustion activities and in the NO2 slip profiles. The configurations chosen have an enormous impact on CO/(CO + CO2) ratios of combustion products as well. The most active catalyst under NOx + O2 is PrO2−x combining a high contribution of active oxygen-assisted soot combustion as well as high NO2 production activity along the catalytic bed.

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Acknowledgments

The authors gratefully acknowledge the financial support of Generalitat Valenciana (Prometeo/2009/047 project) and the Spanish Ministry of Science and Innovation (project CTQ2012-30703, which is co-funded by FEDER resources). N. G. H. wishes to thank Generalitat Valenciana her Ph.D. grant within VAL i+d Program.

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Authors and Affiliations

  1. MCMA Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Alicante, Ap. 99, 03080, Alicante, Spain

    Noelia Guillén-Hurtado, Franz Edwin López-Suárez, Agustín Bueno-López & Avelina García-García

Authors
  1. Noelia Guillén-Hurtado
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  2. Franz Edwin López-Suárez
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  3. Agustín Bueno-López
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  4. Avelina García-García
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Correspondence to Avelina García-García.

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Guillén-Hurtado, N., López-Suárez, F.E., Bueno-López, A. et al. Behavior of different soot combustion catalysts under NOx/O2. Importance of the catalyst–soot contact. Reac Kinet Mech Cat 111, 167–182 (2014). https://doi.org/10.1007/s11144-013-0644-4

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  • DOI: https://doi.org/10.1007/s11144-013-0644-4

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