Evaluation of the catalytic oxidation of soot by CeOX-LaMnO3 at different O2 pressures synthesized by ultrasonic-assisted hydrothermal method

Moreno-Román, E.J.; Cruz‐López, Arquímedes; García-Gómez, Celestino; Zanella, Rodolfo; Suárez-Vázquez, Santiago Iván

doi:10.1007/s11356-020-08003-z

Cited by 9 publications

(3 citation statements)

References 43 publications

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“…The Ce 2 O 3 peaks were identified at 32.59 • , 46.64 • , 56.65 • , and 63.07 • , ascribed to (001), ( 110), (021), and (202) crystalline planes, which matched with the hexagonal Ce 2 O 3 structure of JCPDS No. 044-1086 [30]. The appearance of both the bismuth vanadate and cerium oxide peaks confirmed the coexistence of the two semiconductor oxides in the same system.…”

Section: Xrd Analysismentioning

confidence: 67%

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

Onwudiwe

Phadi

Oyewo

2021

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A p–n heterojunction semiconductor structure composed of Ce3O4 and BiVO4 has been synthesized and then incorporated into reduced graphene oxide (rGO) by the hydrothermal method. The ternary composites were characterized by X-ray diffraction, transmission electron microscopy (TEM), scanning electron microscopy (SEM), electron diffraction spectroscopy (EDS), and UV–vis spectroscopy. The efficiency of the composites as photocatalysts was determined by studying the oxidative degradation of methyl orange in aqueous solution under visible light irradiation. The effect of parameters such as pH, catalyst loading, and concentration of the dye solution was examined in order to determine their influence on the photocatalytic activity of the composites. The composite incorporated into reduced graphene oxide presented the highest percentage (above 90%) in 2 h time, attributed to the effect of the increased surface area. The process of the enhanced photocatalytic activity has been discussed based on the energy band positions of the nanoparticles within the composite.

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Section: Xrd Analysismentioning

confidence: 67%

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

Onwudiwe

Phadi

Oyewo

2021

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“…Crystallite size was calculated from the Scherrer equation as previously reported. For this purpose, additional analyses were carried out between 30 to 35° with a step size of 0.013° [38] . Then, scanning electron microscopy with energy dispersive X‐ray spectroscopy (SEM‐EDS) was used to evaluate both, particle size distribution and elemental chemical composition of the synthesized catalysts (JEOL 6490LV coupled INCA−X detector).…”

Section: Methodsmentioning

confidence: 99%

Comparison between hydrothermal and a facile sonochemical synthesis of Mn_1‐XCe_XO_Y, at different Ce loading, towards the catalytic oxidation of toluene

2023

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Volatile organic compounds (VOCs) are harmful to human health due to their carcinogenicity and toxicity. In addition, they are responsible for the generation of secondary atmospheric pollutants. Catalytic oxidation is an effective alternative for the reduction of these types of emissions. In this context, CeÀ Mn oxides have been reported as excellent catalyst because of their low cost, redox capacity, and oxygen mobility. To date, the best CeÀ Mn oxide catalysts have been produced using hydrothermal synthesis. In the present work, we propose a novel, facile, environmental-friendly, and low-cost sonochemical method for the synthesis of MnÀ Ce oxides with different Ce loadings. The new materials were characterized, and catalytic activity was measured in toluene oxidation reactions. Results demonstrated that, despite the low surface area of MnÀ Ce oxides prepared by sonochemical method, these samples showed a superior catalytic activity with T 90 values of 266 °C. This performance was the result of the higher Mn 4 + content, as well as improved reducibility and activation of O lat species as compared to that of hydrothermally synthesized catalysts. However, the interaction between Mn 2 O 3 and MnO 2 in the hydrothermally synthesized catalysts resulted in a greater stability in long-term oxidation reactions.

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“…38 However, when the K loading exceeded 10%, the (110) diffraction peak moved to higher diffraction, which was related to the formation of new crystal phases. 39 In addition, the grain sizes of the catalysts were calculated by the Scherrer formula, and the values are displayed in Table 1. The crystal size of LM was about 19.85 nm.…”

Section: Structural Propertiesmentioning

confidence: 99%

Engineering surface Mn-enriched species and regulating active oxygen species over LaMnO₃ catalysts by synergistic modification of acid etching and potassium support for soot removal

Dai

Wang

et al. 2022

New J. Chem.

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Evaluation of the catalytic oxidation of soot by CeOX-LaMnO3 at different O2 pressures synthesized by ultrasonic-assisted hydrothermal method

Cited by 9 publications

References 43 publications

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

Comparison between hydrothermal and a facile sonochemical synthesis of Mn_1‐XCe_XO_Y, at different Ce loading, towards the catalytic oxidation of toluene

Engineering surface Mn-enriched species and regulating active oxygen species over LaMnO₃ catalysts by synergistic modification of acid etching and potassium support for soot removal

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Evaluation of the catalytic oxidation of soot by CeOX-LaMnO3 at different O2 pressures synthesized by ultrasonic-assisted hydrothermal method

Cited by 9 publications

References 43 publications

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

Comparison between hydrothermal and a facile sonochemical synthesis of Mn1‐XCeXOY, at different Ce loading, towards the catalytic oxidation of toluene

Engineering surface Mn-enriched species and regulating active oxygen species over LaMnO3 catalysts by synergistic modification of acid etching and potassium support for soot removal

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Product

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Comparison between hydrothermal and a facile sonochemical synthesis of Mn_1‐XCe_XO_Y, at different Ce loading, towards the catalytic oxidation of toluene

Engineering surface Mn-enriched species and regulating active oxygen species over LaMnO₃ catalysts by synergistic modification of acid etching and potassium support for soot removal