Artículo
Evaluation of the Oxygen Mobility in CePO4-Supported Catalysts: Mechanistic Implications on the Water-Gas Shift Reaction
Autor/es | Bobadilla Baladrón, Luis Francisco
Navarro Jaén, Sara Romero Sarria, Francisca Laguna Espitia, Óscar Hernando Bion, Nicolas Odriozola Gordón, José Antonio |
Departamento | Universidad de Sevilla. Departamento de Química Inorgánica |
Fecha de publicación | 2020-07-30 |
Fecha de depósito | 2023-09-20 |
Publicado en |
|
Resumen | The hexagonal and monoclinic phases of CePO4 have been demonstrated to be excellent catalytic supports for Pt-based water-gas shift (WGS) catalysts. Consequently, the elucidation of the WGS reaction mechanism in these ... The hexagonal and monoclinic phases of CePO4 have been demonstrated to be excellent catalytic supports for Pt-based water-gas shift (WGS) catalysts. Consequently, the elucidation of the WGS reaction mechanism in these materials constitutes a fundamental aspect in order to explain their catalytic behavior. Because the observed WGS reaction path is closely related to the absence or presence of oxygen vacancies in the support, the study of the oxygen mobility in these solids constitutes a key factor for the understanding of the structure of the materials and its influence on the reaction mechanism. In this study, the oxygen mobility in CePO4 supports and the corresponding Pt catalysts has been evaluated by means of isotopic exchange experiments using 18O2 and C18O2 as probe molecules. Results demonstrate that the evaluated solids present a low exchange activity when 18O2 is used, indicating the absence of oxygen vacancies in these solids, thus suggesting a poor influence of the WGS redox mechanism. On the contrary, a high oxygen exchange activity is observed using C18O2, demonstrating that the exchange in these materials takes place through the formation of carbonate-like intermediates, thus suggesting the associative mechanism of the WGS reaction as the preferred path in these solids. Operando diffuse reflectance infrared spectroscopy experiments under WGS reaction conditions confirm these results, proving that the WGS reaction in the studied materials takes place through a formate-mediated associative mechanism. Copyright © 2020 American Chemical Society. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España |
Identificador del proyecto | ENE2015-66975-C3-2-R |
Cita | Bobadilla Baladrón, L.F., Navarro Jaén, S., Romero Sarria, F., Laguna Espitia, Ó.H., Bion, N. y Odriozola Gordón, J.A. (2020). Evaluation of the Oxygen Mobility in CePO4-Supported Catalysts: Mechanistic Implications on the Water-Gas Shift Reaction. JOURNAL OF PHYSICAL CHEMISTRY C, 124 (30), 16391-16401. https://doi.org/10.1021/acs.jpcc.0c03649. |
Ficheros | Tamaño | Formato | Ver | Descripción |
---|---|---|---|---|
PDF último.pdf | 1.295Mb | [PDF] | Ver/ | Artículo |
Este registro aparece en las siguientes colecciones
Excepto si se señala otra cosa, la licencia del ítem se describe como: Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Items relacionados
Enseñando items relacionados por título, autor, creador y materia.
-
Trabajo Fin de Grado
La temporalidad en el mercado laboral español: un análisis SHIFT - SHARE por comunidades autónomas para el período 2005 - 2021
Castillo López, Eduardo (2022)En este trabajo de fin de grado se buscará desarrollar un estudio de la temporalidad en Andalucía a lo largo del período ...
-
Trabajo Fin de Máster
Analysis of the YB isotope shift in convection to dark matter
Circuns i Duxans, Martí (2021) -
Ponencia
Measuring the Quality of Shifting and Scaling Patterns in Biclusters
Pontes Balanza, Beatriz; Giráldez, Raúl; Aguilar Ruiz, Jesús Salvador (Springer, 2010)The most widespread biclustering algorithms use the Mean Squared Residue (MSR) as measure for assessing the quality of ...