The Effect of Transition Metal Substitution in the Perovskite-Type Oxides on the Physicochemical Properties and the Catalytic Performance in Diesel Soot Oxidation

The paper is focused on the Fe for Co substitution effect on the redox and catalytic properties in the perovskite structure of GdFeO3. The solid oxides with the composition GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) were obtained by the sol-gel method and characterized by various methods: X-ray diffract...

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Bibliographic Details
Published in:Catalysts 2021-10, Vol.11 (10), p.1256
Main Authors: Yafarova, Liliya V., Mamontov, Grigory V., Chislova, Irina V., Silyukov, Oleg I., Zvereva, Irina A.
Format: Article
Language:English
Subjects:
Carbon dioxide
Catalysts
Catalytic oxidation
Chemical reactions
Cobalt
Diesel fuels
Iron
Iron oxides
Materials substitution
Metals
Oxidation
Oxides
Oxygen
Perovskite structure
Perovskites
Photoelectrons
Sol-gel processes
Solid solutions
Soot
soot oxidation
Substitution reactions
temperature-programmed reaction
Thermal analysis
transition metal oxides
Transition metals
X ray photoelectron spectroscopy
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Summary:The paper is focused on the Fe for Co substitution effect on the redox and catalytic properties in the perovskite structure of GdFeO3. The solid oxides with the composition GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) were obtained by the sol-gel method and characterized by various methods: X-ray diffraction (XRD), temperature-programmed reduction (H2-TPR), N2 sorption, temperature-programmed desorption of oxygen (TPD-O2), simultaneous thermal analysis (STA), and X-ray photoelectron spectroscopy (XPS). The H2-TPR results showed that an increase in the cobalt content in the GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) leads to a decrease in the reduction temperature. Using the TPD-O2 and STA methods, the lattice oxygen mobility is increasing in the course of the substitution of Fe for Co. Thus, the Fe substitution in the perovskite leads to an improvement in the oxygen reaction ability. Experiments on the soot oxidation reveal that catalytic oxidation ability increases in the series: GdFe0.5Co0.5O3 ˂ GdFe0.2Co0.8O3 ˂ GdCoO3, which is in good correlation with the increasing oxygen mobility according to H2-TPR, TPD-O2, and STA results. The soot oxidation over GdFeO3 and GdFe0.8Co0.2O3 is not in this range due to the impurities of iron oxides and higher specific surface area.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal11101256