2026-06-01T01:09:44Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/239492026-02-03T10:52:29Zcom_10630_2254col_10630_37953
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Cortés-Reyes, Marina
author
Martínez Munuera, Juan Carlos
author
Herrera-Delgado, María Concepción
author
Larrubia-Vargas, María Ángeles
author
Alemany-Arrebola, Luis José
author
García-García, Avelina
2022-04-20T07:27:03Z
2022-04-20T07:27:03Z
2021
Cortés-Reyes, Marina & Martínez-Munuera, Juan & Herrera, Concepcion & Larrubia, M. & Alemany, Luis & García García, Avelina. (2021). Isotopic study of the influence of oxygen interaction and surface species over different catalysts on the soot removal mechanism. Catalysis Today. 10.1016/j.cattod.2021.07.015.
https://hdl.handle.net/10630/23949
https://doi.org/10.1016/j.cattod.2021.07.015
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.
eng
Ingeniería química
Catálisis
Isotopic study of the influence of oxygen interaction and surface species over different catalysts on the soot removal mechanism
journal article
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