BaFe1−xCuxO3 Perovskites as Soot Oxidation Catalysts for Gasoline Particulate Filters (GPF): A Preliminary Study

A series of BaFe 1−x Cu x O 3 catalysts (x = 0, 0.1, 0.3 and 0.4) have been synthetized, characterized and used for soot oxidation in gasoline direct injection (GDI) exhaust conditions. The characterization of the catalysts (by BET, ICP-OES, XRD, XPS, H 2 -TPR and O 2 -TPD) reveals that copper is in...

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Bibliographic Details
Published in:Topics in catalysis 2019-02, Vol.62 (1-4), p.413-418
Main Authors: Moreno-Marcos, C., Torregrosa-Rivero, V., Albaladejo-Fuentes, V., Sánchez-Adsuar, M. S., Illán-Gómez, M. J.
Format: Article
Language:English
Subjects:
Biological evolution
Catalysis
Catalysts
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Copper
Copper converters
Exhaust gases
Fluid filters
Gasoline
Industrial Chemistry/Chemical Engineering
Lattice vacancies
Original Paper
Oxidation
Perovskite structure
Perovskites
Pharmacy
Physical Chemistry
Soot
X ray photoelectron spectroscopy
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Summary:A series of BaFe 1−x Cu x O 3 catalysts (x = 0, 0.1, 0.3 and 0.4) have been synthetized, characterized and used for soot oxidation in gasoline direct injection (GDI) exhaust conditions. The characterization of the catalysts (by BET, ICP-OES, XRD, XPS, H 2 -TPR and O 2 -TPD) reveals that copper is incorporated into the perovskite lattice leading to: (i) the distortion of the original hexagonal perovskite structure for the lowest copper content catalyst (BFC1) and the modification of the structure, from hexagonal to cubic, for the catalysts with higher copper content (BFC3 and BFC4), (ii) the generation of a BaOx–CuOx oxide as minority segregated phase for BFC4 catalyst, (iii) the increase in the amount of oxygen surface vacancies for BFC3 and BFC4 catalysts, and (iv) the decrease in the total amount of O 2 released during O 2 -TPD experiments. All the BaFe 1−x Cu x O 3 perovskites are active for soot oxidation under the highest demanding GDI exhaust conditions (regular stoichiometric GDI operation, i.e., 0% O 2 ). The catalyst with the highest copper content (BFC4) shows the highest soot conversion, related to its largest amount of β-oxygen evolved, and, to the presence of a high amount of copper species (as BaOx–CuOx oxide) on its surface.
ISSN:1022-5528
1572-9028
DOI:10.1007/s11244-018-1126-8