Copper doped BaMnO3 perovskite catalysts for NO oxidation and NO2-assisted diesel soot removal

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Title: Copper doped BaMnO3 perovskite catalysts for NO oxidation and NO2-assisted diesel soot removal
Authors: Torregrosa Rivero, Verónica | Albaladejo-Fuentes, Vicente | Sánchez-Adsuar, María Salvadora | Illán-Gómez, María José
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: NO oxidation | NO2-assisted diesel soot removal | Copper doped | BaMnO3 perovskite catalysts
Knowledge Area: Química Inorgánica
Issue Date: 13-Jul-2017
Publisher: Royal Society of Chemistry
Citation: RSC Advances. 2017, 7: 35228-35238. doi:10.1039/C7RA04980C
Abstract: The activity for NO oxidation and for NO2-assisted diesel soot removal of a BaMn1−xCuxO3 (x = 0, 0.1, 0.2, 0.3) perovskite-type catalyst has been tested by Temperature Programmed Reaction (TPR) and isothermal experiments at 450 °C. Fresh and used catalyst characterization by ICP-OES, N2 adsorption, XRD, XPS, IR spectroscopy and H2-TPR was performed. Results showed that: (i) manganese is partially substituted by copper in the perovskite structure leading to the formation of a manganese-deficient perovskite with a new hexagonal structure, (ii) in BaMn1−xCuxO3 catalysts, manganese seems to be mainly Mn(III) and, as a consequence, the amount of oxygen vacancies increases gradually with the copper content and (iii) the presence of copper into the perovskite structure enhances the reducibility of the catalyst and increases the mobility of lattice oxygen. BaMn0.7Cu0.3O3 is the most active catalyst for NO2 generation and, consequently, shows the lowest T50% value, the highest CO2 selectivity, the best performance during TPR cyclic experiments, and the highest soot oxidation rate at 450 °C. This behavior is a result of the enhancement of the redox properties of the catalyst due to the replacement of Mn(III)/Mn(IV) by Cu(II) in the perovskite structure.
Sponsor: The authors thank Spanish Government (MINECO project CTQ2015-64801-R), the European Union (FEDER) and the Generalitat Valenciana (Project PROMETEOII/2014/10) for the financial support. Vicente Albaladejo-Fuentes thanks the University of Alicante for his Ph.D. grant and Veronica Torregrosa-Rivero thanks SECAT for her “Introduction to Research” grant.
ISSN: 2046-2069
DOI: 10.1039/C7RA04980C
Language: eng
Type: info:eu-repo/semantics/article
Rights: This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
Peer Review: si
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