Synthesis and Characterization of Ce-Fe Composite Nanoparticles via Sol-gel Method

Surendran, Aishwarya; Gupta, Nitish; Aziz, Fozia; Kushwaha, K. K.

doi:10.21272/jnep.12(1).01025

Cited by 4 publications

(2 citation statements)

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“…Other synthesis methods have also been proposed, including the co-precipitation method [22,[27][28][29] and sol-gel technique [30,31], which are also complex and/or require high calcination temperatures (550-1000 • C) and long reaction time (3-48 h). At the same time, there are difficulties in the targeted synthesis of nanostructured CeFeO 3 by these methods.…”

Section: Introductionmentioning

confidence: 99%

CeFeO3–CeO2–Fe2O3 Systems: Synthesis by Solution Combustion Method and Catalytic Performance in CO2 Hydrogenation

et al. 2022

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Rare-earth orthoferrites have found wide application in thermocatalytic reduction-oxidation processes. Much less attention has been paid, however, to the production of CeFeO3, as well as to the study of its physicochemical and catalytic properties, in particular, in the promising process of CO2 utilization by hydrogenation to CO and hydrocarbons. This study presents the results of a study on the synthesis of CeFeO3 by solution combustion synthesis (SCS) using various fuels, fuel-to-oxidizer ratios, and additives. The SCS products were characterized by XRD, FTIR, N2-physisorption, SEM, DTA–TGA, and H2-TPR. It has been established that glycine provides the best yield of CeFeO3, while the addition of NH4NO3 promotes an increase in the amount of CeFeO3 by 7–12 wt%. In addition, the synthesis of CeFeO3 with the participation of NH4NO3 makes it possible to surpass the activity of the CeO2–Fe2O3 system at low temperatures (300–400 °C), as well as to increase selectivity to hydrocarbons. The observed effects are due to the increased gas evolution and ejection of reactive FeOx nanoparticles on the surface of crystallites, and an increase in the surface defects. CeFeO3 obtained in this study allows for achieving higher CO2 conversion compared to LaFeO3 at 600 °C.

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Section: Introductionmentioning

confidence: 99%

CeFeO3–CeO2–Fe2O3 Systems: Synthesis by Solution Combustion Method and Catalytic Performance in CO2 Hydrogenation

et al. 2022

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“…Moreover, its activity is superior to LaFeO 3 , previously studied in [18]. Compared to other methods to prepare cerium orthoferrite [27][28][29][30][31][32], the SCS method is much less labor-intensive and allows one to regulate the conditions for obtaining phase-pure and homogeneous powders. An important advantage of obtaining CeFeO 3 by this method is also the option of carrying out synthesis in a reducing atmosphere created by the gaseous products of a thermochemical reaction, which is important to prevent the oxidation of perovskite at T > 350 • C [20,26].…”

Section: Introductionmentioning

confidence: 99%

Alumina and silica supported Ce-Fe-O systems obtained by the solution combustion method and their performance in CO2 hydrogenation to syngas

Matveyeva,

Omarov,

Gavrilova

2023

Nanosystems: Phys. Chem. Math.

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This study presents Ce-Fe-O systems supported on γ-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. γ-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 ACKNOWLEDGEMENTS This research was funded by the Russian Science Foundation (grant number 22-23-20094, https://rscf.ru/project/22-23-20094/, accessed on 26 October 2023) and the St.-Petersburg Science Foundation (agreement number 26/2022 from 14 April 2022). FOR CITATION Matveyeva A.N., Omarov S.O., Gavrilova M.A. Alumina and silica supported Ce-Fe-O systems obtained by the solution combustion method and their performance in CO 2 hydrogenation to syngas.

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Comparison of Perovskite Systems Based on AFeO3 (A = Ce, La, Y) in CO2 Hydrogenation to CO

Matveyeva,

Omarov

2024

Trans. Tianjin Univ.

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CO2 is the most cost-effective and abundant carbon resource, while the reverse water–gas reaction (rWGS) is one of the most effective methods of CO2 utilization. This work presents a comparative study of rWGS activity for perovskite systems based on AFeO3 (where A = Ce, La, Y). These systems were synthesized by solution combustion synthesis (SCS) with different ratios of fuel (glycine) and oxidizer (φ), different amounts of NH4NO3, and the addition of alumina or silica as supports. Various techniques, including X-ray diffraction analysis, thermogravimetric analysis, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy, energy-dispersive X-ray spectroscopy, N2-physisorption, H2 temperature-programmed reduction, temperature-programmed desorption of H2 and CO2, Raman spectroscopy, and in situ FTIR, were used to relate the physicochemical properties with the catalytic performance of the obtained composites. Each specific perovskite-containing system (either bulk or supported) has its own optimal φ and NH4NO3 amount to achieve the highest yield and dispersion of the perovskite phase. Among all synthesized systems, bulk SCS-derived La–Fe–O systems showed the highest resistance to reducing environments and the easiest hydrogen desorption, outperforming La–Fe–O produced by solgel combustion (SGC). CO2 conversion into CO at 600 °C for bulk ferrite systems, depending on the A-cation type and preparation method, follows the order La (SGC) < Y < Ce < La (SCS). The differences in properties between La–Fe–O obtained by the SCS and SGC methods can be attributed to different ratios of oxygen and lanthanum vacancy contributions, hydroxyl coverage, morphology, and free iron oxide presence. In situ FTIR data revealed that CO2 hydrogenation occurs through formates generated under reaction conditions on the bulk system based on La–Fe–O, obtained by the SCS method. γ-Al2O3 improves the dispersion of CeFeO3 and LaFeO3 phases, the specific surface area, and the quantity of adsorbed H2 and CO2. This led to a significant increase in CO2 conversion for supported CeFeO3 but not for the La-based system compared to bulk and SiO2-supported perovskite catalysts. However, adding alumina increased the activity per mass for both Ce- and La-based perovskite systems, reducing the amount of rare-earth components in the catalyst and thereby lowering the cost without substantially compromising stability.

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Synthesis and Characterization of Ce-Fe Composite Nanoparticles via Sol-gel Method

Cited by 4 publications

References 0 publications

CeFeO3–CeO2–Fe2O3 Systems: Synthesis by Solution Combustion Method and Catalytic Performance in CO2 Hydrogenation

CeFeO3–CeO2–Fe2O3 Systems: Synthesis by Solution Combustion Method and Catalytic Performance in CO2 Hydrogenation

Alumina and silica supported Ce-Fe-O systems obtained by the solution combustion method and their performance in CO2 hydrogenation to syngas

Comparison of Perovskite Systems Based on AFeO3 (A = Ce, La, Y) in CO2 Hydrogenation to CO

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