The Influence of Precursor on the Preparation of CeO2 Catalysts for the Total Oxidation of the Volatile Organic Compound Propane

Aggett, Kieran; Davies, Thomas E.; Morgan, David; Hewes, Daniel; Taylor, Stuart Hamilton

doi:10.3390/catal11121461

Cited by 8 publications

(4 citation statements)

References 60 publications

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“…Figure 5 d presents the fitted high-resolution spectrum of the O 1s region, which reveals the presence of a strong peak at 528.7 eV due to the presence of lattice oxygen in the O 2– state in the product. 70 The weakly intense peak observed at 529.5 eV is assigned to the −OH group from adsorbed moisture, while the broad peak at 531.1 eV corresponds to the oxygen vacancy (V O ) in the sample. 71 …”

Section: Resultsmentioning

confidence: 99%

Template-Less and Surfactant-Less Synthesis of CeO₂ Nanostructures for Catalytic Application in Ipso-hydroxylation of Aryl Boronic Acids and the aza-Michael Reaction

et al. 2022

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Due to its excellent physicochemical properties, CeO2 has found great importance as an electrochemical and in electronics, photocatalysis, sensing, and heterogeneous catalysis. Herein, we report the surfactant-less and template-less synthesis of CeO2 nanostructures by the hydrothermal method. The synthesized CeO2 nanostructures have been characterized in detail by electron microscopy, spectroscopy, diffractometry, and other analytical methods. The XRD studies revealed the formation of pure crystalline CeO2, possessing a cubic fluorite structure with an average crystallite size of 15.6 to 16.4 nm. Electron microscopy studies reveal the formation of cube-shaped CeO2 nanostructures with sizes below 25 nm. The cube-shaped CeO2 nanostructures exhibited a higher BET surface area compared to their bulk counterparts. The XPS analysis has confirmed the existence of Ce in the mixed oxidation states of +3 and +4, while O is present as O2– in the sample. The as-synthesized CeO2 nanostructures exhibit excellent catalytic activity in both the ipso-hydroxylation of aryl boronic acids and the aza-Michael reaction. The analysis of the used catalyst has confirmed its stability under the reported reaction conditions. The catalysts retain their catalytic activity up to the fifth run in both types of reactions, which is economically beneficial for industrial application.

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Section: Resultsmentioning

confidence: 99%

Template-Less and Surfactant-Less Synthesis of CeO₂ Nanostructures for Catalytic Application in Ipso-hydroxylation of Aryl Boronic Acids and the aza-Michael Reaction

et al. 2022

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“…50 The presence of a "low-temperature maximum" determines the catalytic activity of ceria in oxidation reactions. 51 Table 2 shows that the CO_st sample consumes more hydrogen in the low-temperature region compared to the CO_cit, which is associated with a larger specific surface area and dispersity of ceria.…”

Section: Tpr-hmentioning

confidence: 99%

Ce–Zr–Mn Oxide Catalysts for Soot Combustion: The Role of Preparation Method

Dorofeeva,

Savel’eva,

Grabchenko

et al. 2024

J. Phys. Chem. C

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In catalysis science and technology, the catalytic performance of materials is strongly dependent on the preparation method used. The catalysts with similar composition can show significantly different performance, while the causing factors remain debated. Here, we show the effect of preparation methods on the soot combustion performance of ternary MnO x −CeO 2 −ZrO 2 catalysts prepared by a citric acid-assisted method and the solvothermal approach utilizing propionic acid. In both series of catalysts, the T max of soot combustion changes in a row: CeO 2 − MnO x < CeO 2 < CeO 2 −ZrO 2 −MnO x < CeO 2 −ZrO 2 , and the catalyst components, regardless of their form and distribution within the sample, feature synergistic effects in the soot combustion reaction. A notable decrease in the soot combustion temperature is observed for all samples prepared by the solvothermal approach as compared to the citrate series, which is caused by the enhanced interphase air-catalyst-soot interaction, resulting in the formation of an interfacial structure of the "Mn−O−Mn−O−Ce" type, generation of oxygen vacancies, and reoxidation of active oxide species at the MnO x /Ce x Zr 1−x O 2 interfaces.

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“…Metal oxide and mixed metal oxide catalysts have seen a recent increase in research into their application as VOC oxidation catalysts, due to the high costs of precursor materials used for preparing supported noble metal catalysts [13]. Manganese oxide catalysts have been identified as particularly active materials for a wide range of VOC oxidation reactions, including propane, hexane, toluene, naphthalene, ethanol, and ethyl acetate .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Metal Ratio and Precipitation Agent on Highly Active Iron-Manganese Mixed Metal Oxide Catalysts for Propane Total Oxidation

et al. 2023

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Iron-manganese mixed metal oxide catalysts with a range of Fe:Mn ratios were synthesised by co-precipitation using sodium carbonate and evaluated for total propane oxidation. The Fe0.50Mn0.50Ox catalyst was the most active, and this was due to increased surface area along with the formation of a Mn2O3 phase that was not present in the other catalysts. The effect of the precipitating agent was evaluated with the Fe0.50Mn0.50Ox catalyst, investigating preparation using (NH4)2CO3, K2CO3, NH4OH, KOH, and NaOH. In almost all cases, the activity of propane oxidation was increased compared to the Na2CO3-prepared catalyst, with the hydroxide-precipitated catalysts generally being more active than the carbonates. The NH4OH catalyst was the best performing and this was thought to be due to the formation of a highly active mixed defect spinel structure. Results demonstrate that highly active mixed metal oxide total oxidation catalysts can be prepared using abundant elements, and the choice of precipitating agent is important to maximise the activity.

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The Influence of Precursor on the Preparation of CeO2 Catalysts for the Total Oxidation of the Volatile Organic Compound Propane

Cited by 8 publications

References 60 publications

Template-Less and Surfactant-Less Synthesis of CeO₂ Nanostructures for Catalytic Application in Ipso-hydroxylation of Aryl Boronic Acids and the aza-Michael Reaction

Template-Less and Surfactant-Less Synthesis of CeO₂ Nanostructures for Catalytic Application in Ipso-hydroxylation of Aryl Boronic Acids and the aza-Michael Reaction

Ce–Zr–Mn Oxide Catalysts for Soot Combustion: The Role of Preparation Method

The Effect of Metal Ratio and Precipitation Agent on Highly Active Iron-Manganese Mixed Metal Oxide Catalysts for Propane Total Oxidation

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The Influence of Precursor on the Preparation of CeO2 Catalysts for the Total Oxidation of the Volatile Organic Compound Propane

Cited by 8 publications

References 60 publications

Template-Less and Surfactant-Less Synthesis of CeO2 Nanostructures for Catalytic Application in Ipso-hydroxylation of Aryl Boronic Acids and the aza-Michael Reaction

Template-Less and Surfactant-Less Synthesis of CeO2 Nanostructures for Catalytic Application in Ipso-hydroxylation of Aryl Boronic Acids and the aza-Michael Reaction

Ce–Zr–Mn Oxide Catalysts for Soot Combustion: The Role of Preparation Method

The Effect of Metal Ratio and Precipitation Agent on Highly Active Iron-Manganese Mixed Metal Oxide Catalysts for Propane Total Oxidation

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Product

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Template-Less and Surfactant-Less Synthesis of CeO₂ Nanostructures for Catalytic Application in Ipso-hydroxylation of Aryl Boronic Acids and the aza-Michael Reaction

Template-Less and Surfactant-Less Synthesis of CeO₂ Nanostructures for Catalytic Application in Ipso-hydroxylation of Aryl Boronic Acids and the aza-Michael Reaction