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CHEMISTRY AND MATERIAL SCIENCE
Alumina and silica supported Ce–Fe–O systems obtained by the solution combustion method and their performance in CO$_2$ hydrogenation to syngas
Anna N. Matveyevaa,
Shamil O. Omarova,
Marianna A. Gavrilovaab a Ioffe Institute, St.-Petersburg, Russia
b St.-Petersburg State Institute of Technology (Technical University), St.-Petersburg, Russia
Abstract:
This study presents Ce–Fe–O systems supported on
$\gamma$-Al
$_2$O
$_3$ or SiO
$_2$ to enhance the reactivity of an oxygen-deficient CeFeO
$_3$ perovskite phase, which are promising catalysts for the production of fuels and chemicals from CO
$_2$ as feedstock. The synthesis was carried out by the glycine-nitrate solution combustion method at various fuel-to-oxidizer ratios, and with or without the addition of ammonium nitrate. The obtained composites were characterized by XRD, SEM, EDX, N
$_2$-physisorption, H
$_2$-TPR, and CO
$_2$-TPD to study the relationship of physicochemical properties with catalytic CO
$_2$ hydrogenation (rWGS) activity.
$\gamma$-Al
$_2$O
$_3$ was found to be a more suitable support than SiO
$_2$ due to its ability to form a higher content of the perovskite phase, significantly reduce the size of CeFeO
$_3$ crystallites, and increase oxygen defectiveness and CO
$_2$ adsorption capacity. Combustion in the presence of silica results in the binding of most of cerium into a silicate phase, which is inactive for rWGS.
Keywords:
perovskites, cerium orthoferrite, CeFeO$_3$, alumina, silica, solution combustion synthesis, glycine, carbon dioxide, CO$_2$ hydrogenation, rWGS. Received: 28.07.2023
Revised: 11.10.2023
Accepted: 30.10.2023
Language: English
DOI:
10.17586/2220-8054-2023-14-6-679-689
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