Tailoring the Composition of BaxBO3 (B = Fe, Mn) Mixed Oxides as CO or Soot Oxidation Catalysts in Simulated GDI Engine Exhaust Conditions

Mixed oxides with perovskite-type structure (ABO3) are promising catalysts for atmospheric pollution control due to their interesting and tunable physicochemical properties. In this work, two series of BaxMnO3 and BaxFeO3 (x = 1 and 0.7) catalysts were synthesized using the sol–gel method adapted to...

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Published in:Molecules (Basel, Switzerland) Switzerland), 2023-04, Vol.28 (8), p.3327
Main Authors: Díaz-Verde, Álvaro, Montilla-Verdú, Salvador, Torregrosa-Rivero, Verónica, Illán-Gómez, María-José
Format: Article
Language:English
Subjects:
Adsorption
Air pollution
Aqueous solutions
Barium
Carbon monoxide
Catalysts
Catalytic activity
CO oxidation
Emissions
Engines
Exhaust emissions
Gasoline
GDI soot oxidation
iron
Manganese
Mixed oxides
Oxidation
Oxides
perovskite
Perovskite structure
Perovskites
Physicochemical properties
Pollutants
Pollution control
Sol-gel processes
Soot
Working conditions
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Summary:Mixed oxides with perovskite-type structure (ABO3) are promising catalysts for atmospheric pollution control due to their interesting and tunable physicochemical properties. In this work, two series of BaxMnO3 and BaxFeO3 (x = 1 and 0.7) catalysts were synthesized using the sol–gel method adapted to aqueous medium. The samples were characterized by μ-XRF, XRD, FT-IR, XPS, H2-TPR, and O2-TPD. The catalytic activity for CO and GDI soot oxidation was determined by temperature-programmed reaction experiments (CO-TPR and soot-TPR, respectively). The results reveal that a decrease in the Ba content improved the catalytic performance of both catalysts, as B0.7M-E is more active than BM-E for CO oxidation, and B0.7F-E presents higher activity than BF for soot conversion in simulated GDI engine exhaust conditions. Manganese-based perovskites (BM-E and B0.7M-E) achieve better catalytic performance than iron-based perovskite (BF) for CO oxidation reaction due to the higher generation of actives sites.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28083327