Influence of the preparation method and silver content on the nature of active sites in Ag/CeO2 catalysts used for propylene oxidation

Benaissa, Sihem; Chérif-Aouali, L.; Hany, Sara; Labaki, Madona; Aouad, Samer; Cousin, Renaud; Siffert, Stéphane; Aboukaı̈s, Antoine

doi:10.1016/j.chemphys.2022.111499

Cited by 9 publications

(2 citation statements)

References 32 publications

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“…The formation of the oxygen vacancy can be determined by EPR spectra. − As shown in Figure d, the intensities of peaks decrease with the increase of calcination temperature from 250 to 450 °C. However, Mn 5 Al-550 has the strongest signal intensity among them.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Surface Mn/Al Ratio and Crystal Crystallinity of Mn–Al Oxides by Calcination Temperature for Excellent Acetone Low-Temperature Mineralization

Lǐ

Zheng

et al. 2023

ACS EST Eng.

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Here, Mn−Al oxides with the strengthened synergistic effect of Mn and Al species were fabricated by facilely adjusting the calcination temperature with the hydrolysis-driven redox-precipitation method. Results demonstrated that the surface Mn/Al ratio and KMn 8 O 16 phase can be effectively tamed under different calcination temperatures, which obviously alter the CO 2 selectivity, reaction rate, and stability of Mn−Al oxides for catalytic oxidation of acetone, among which the Mn 5 Al-350 catalyst exhibits the best catalytic performance (90% of acetone converted at 159 °C) with CO 2 selectivity higher than 99.5%, mainly owing to its higher surface Mn/Al ratio and weaker Mn−O bond with more Mn 3+ as compared to Mn 5 Al-250, Mn 5 Al-450, and Mn 5 Al-550. Although a decrease in the consumption rate of acetic acid in the presence of 3.0 vol % H 2 O leads to the slight reduction of acetone conversion and CO 2 yield, Mn 5 Al-350 still exhibits a superior catalytic stability. The reaction intermediates including acetaldehyde, ethanol, acetic acid, and formic acid species before total mineralization are determined by proton transfer reaction−mass spectrometry, theoretical calculations, and in situ DRIFTS. Theoretical calculations also reveal that the p-orbital interaction of C with a certain anisotropy leads to a weak catalytic effect in the process of acetic acid decomposition as the rate-limiting step.

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Section: Resultsmentioning

confidence: 99%

Tuning the Surface Mn/Al Ratio and Crystal Crystallinity of Mn–Al Oxides by Calcination Temperature for Excellent Acetone Low-Temperature Mineralization

Lǐ

Zheng

et al. 2023

ACS EST Eng.

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“…Silver metal is widely used in sensors, [8] catalysts, [9] batteries [10] and other fields due to its excellent electrical and thermal conductivity, admirable chemical stability and ductility with the rapid development of the industry. However, this also poses the problem of large discharges of silver‐containing wastewater.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance of A Lime‐Preconditioned Phosphogypsum/Ag‐based Bacteriostatic Composite by Highly Efficient Loading of Ag (I) from Wastewater

Deng

Luo

et al. 2023

ChemistrySelect

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This work was supported by the Natural Science Foundation of Southwest University of Science and Technology (15zx7125); the Foundation of Post‐doctoral Scientific Research Station of Wengfu (Group) Co., Ltd. (YF(2020)022); the Foundation of National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization (SF201906); the Sichuan Science and Technology Program (2023YFS0359); and the Undergraduate Innovation Fund Project Precision Funding Program by Southwest University of Science and Technology (s202210619057, 22XCY057)

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MnOx catalysts supported on SBA-15 and MCM-41 silicas for a competitive VOCs mixture oxidation: In-situ DRIFTS investigations

Moreno-Román,

Can,

Meille

et al. 2024

Applied Catalysis B: Environmental

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Influence of the preparation method and silver content on the nature of active sites in Ag/CeO2 catalysts used for propylene oxidation

Cited by 9 publications

References 32 publications

Tuning the Surface Mn/Al Ratio and Crystal Crystallinity of Mn–Al Oxides by Calcination Temperature for Excellent Acetone Low-Temperature Mineralization

Tuning the Surface Mn/Al Ratio and Crystal Crystallinity of Mn–Al Oxides by Calcination Temperature for Excellent Acetone Low-Temperature Mineralization

Preparation and Performance of A Lime‐Preconditioned Phosphogypsum/Ag‐based Bacteriostatic Composite by Highly Efficient Loading of Ag (I) from Wastewater

MnOx catalysts supported on SBA-15 and MCM-41 silicas for a competitive VOCs mixture oxidation: In-situ DRIFTS investigations

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