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    Isotopic study of the influence of oxygen interaction and surface species over different catalysts on the soot removal mechanism

    • Autor
      Cortés-Reyes, MarinaAutoridad Universidad de Málaga; Martínez Munuera, Juan Carlos; Herrera-Delgado, María ConcepciónAutoridad Universidad de Málaga; Larrubia-Vargas, María ÁngelesAutoridad Universidad de Málaga; Alemany-Arrebola, Luis JoséAutoridad Universidad de Málaga; García-García, Avelina
    • Fecha
      2021
    • Editorial/Editor
      Elsevier
    • Palabras clave
      Ingeniería química; Catálisis
    • Resumen
      In order to improve the catalytic formulations for soot removal in after-treatment emission control technologies for gasoline and diesel engine vehicle, an isotopic study was approached using transitory labeled oxygen response method over model catalysts that allows the unraveling of soot oxidation mechanism. Ce-based materials promote oxygen exchange associated with the high population of lattice oxygen species (O2-) denoted as OI type. The incorporation of praseodymium produces a Pr3+ enrichment that decrease the energy for oxygen release and increase oxygen mobility through surface and subsurface oxygen centers (OII type) depending on the synthesis procedure. For PtBaK catalyst, OIII species are responsible for oxygen exchange. Gas-solid reaction between soot and gas phase molecular oxygen is responsible for direct uncatalyzed soot oxidation. For ceria containing catalysts, low-temperature soot removal takes place through the intervention of lattice atomic species and superoxide species. For DPNR model catalyst, PtBaK/Al2O3, the soot elimination occurs with the intervention of OIII type centers. In the presence NO, the assisted and cooperative mechanism due to NO2 and the intervention of the adsorbed nitrate species on the trimetallic catalyst enhances soot removal capacity.
    • URI
      https://hdl.handle.net/10630/23949
    • DOI
      https://dx.doi.org/https://doi.org/10.1016/j.cattod.2021.07.015
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    1-s2.0-S0920586121003230-main.pdf (1.364Mb)
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    Estadísticas

    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA
    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA
     

     

    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA
    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA