Ceria-based catalysts for NOx removal in NSR processes: A fundamental study of the catalyst modifications explored by in situ techniques

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Título: Ceria-based catalysts for NOx removal in NSR processes: A fundamental study of the catalyst modifications explored by in situ techniques
Autor/es: Martínez-Munuera, Juan Carlos | Giménez-Mañogil, Javier | Castoldi, Lidia | Lietti, Luca | Garcia-Garcia, Avelina
Grupo/s de investigación o GITE: Materiales Carbonosos y Medio Ambiente
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Palabras clave: NO reduction | Ceria-zirconia | Copper | Surface Hydroxyl consumption | Surface Nitrites/nitrates formation | Oxygen vacancies
Área/s de conocimiento: Química Inorgánica
Fecha de publicación: 1-nov-2020
Editor: Elsevier
Cita bibliográfica: Applied Surface Science. 2020, 529: 147019. https://doi.org/10.1016/j.apsusc.2020.147019
Resumen: In this work, a fundamental and systematic study was conducted, leading to a better understanding of the phenomena occurring on the catalyst’s surface during the NOx reduction process in NSR systems. For this purpose, ceria-based catalysts, with Cu in substitution of noble metal, have been synthesized and deeply characterized by means of XRF, XPS, in situ (XRD, Raman spectroscopy and DRIFTS), temperature-programmed reduction under H2 (H2-TPR) and under NO reaction (NO isothermal reaction + NO-TPR). The whole results show the key role of copper to promote the reducibility and the creation of oxygen vacancies, allowing a high NO consumption and fast kinetics of N2O and N2 formation, until the oxygen vacancies consumption takes place. The study of the surface reactions taking place in the formation of adsorbed NOx species and the oxygen vacancies consumption with NO uptake is complex; however, a hydroxyl consumption route is found to be involved. The reduction of NO provided higher levels of N2 at higher temperatures; also, a very high efficiency of the previously created oxygen vacancies was found for this process.
Patrocinador/es: The authors gratefully acknowledge the financial support of Generalitat Valenciana (PROMETEO/2018/076 project) and the Spanish Ministry of Science and Innovation (PID2019-105542RB-I00 project) and the UE-FEDER funding. Martínez-Munuera also acknowledges Spanish Ministry of Science, Innovation and Universities for the financial support through a FPU grant (FPU17/00603).
URI: http://hdl.handle.net/10045/108149
ISSN: 0169-4332 (Print) | 1873-5584 (Online)
DOI: 10.1016/j.apsusc.2020.147019
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2020 Elsevier B.V.
Revisión científica: si
Versión del editor: https://doi.org/10.1016/j.apsusc.2020.147019
Aparece en las colecciones:INV - MCMA - Artículos de Revistas

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