Synthesis and characterization of CeO2 nanocrystals by solvothermal route

Kumar, E. Ramesh; Selvarajan, P.; Muthuraj, D.

doi:10.1590/s1516-14392013005000021

Cited by 95 publications

(25 citation statements)

References 46 publications

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“…5). The value of 3.19 eV was obtained, which is precisely the value of the band gap of bulk ceria 26 . One would expect a considerable blue shift of the band gap due to the quantum confinement effect in small particles.…”

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confidence: 52%

Catalytic Oxidation of Toluene on Hydrothermally Prepared Ceria Nanocrystals

Duplančić¹

2018

Chem.Biochem.Eng.Q.

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Ceria nanocrystals were prepared hydrothermally and tested as potential catalysts for oxidation of volatile organic compounds using toluene as a model compound. Pure ceria with a crystallite size of 4 nm, determined by the Scherrer method from XRD pattern has been obtained. The specific surface area of the prepared nanoparticles determined by BET analysis yielded 201 m 2 g -1, while the band gap of 3.2 eV was estimated from DRS spectrum via Tauc's plot. Catalytic tests were performed on calcined ceria (500 °C) with increased crystallite size (9 nm) caused by thermal treatment. The tests showed good activities for the toluene oxidation with T 50 temperatures, corresponding to 50 % toluene conversion, observed at 250 °C and even lower temperatures depending on the total flow rate of the gas mixture. The one-dimensional pseudo-homogeneous model of the fixed bed reactor was proposed to describe the reactor performance and the appropriate kinetic parameters were estimated. Good agreement between experimental data and the proposed model was observed.

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confidence: 52%

Catalytic Oxidation of Toluene on Hydrothermally Prepared Ceria Nanocrystals

Duplančić¹

2018

Chem.Biochem.Eng.Q.

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“…The absorption band at ∼1450 and ∼1042 cm −1 could be ascribed to the presence of unwanted NO 3 − groups and other residues, respectively [18,46]. The bands sited in the range of 800-840 and ∼520 cm −1 may be due to Ce-O stretching frequency indicating the formation of ceria [47]. In addition to the peaks assigned above for both samples, the peak observed at 550 cm −1 could be recommended to Zr-O bond for the Au/CZ sample [48].…”

Section: Resultsmentioning

confidence: 99%

Enhanced Catalytic Activity of Supported Gold Catalysts for Oxidation of Noxious Environmental Pollutant CO

Saikia

Miah

Malakar

et al. 2015

Indian Journal of Materials Science

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Noble metal nanomaterials have attracted mounting research attention for applications in diverse fields of catalysis, biology, and nanotechnology. In the present study, we have undertaken a detailed investigation on synthesis, characterization, and catalytic activity studies for CO oxidation by nanogold catalysts supported over CeO 2 and CeO 2 -ZrO 2 (1 : 1 mole ratio). The support systems were prepared by modified, simple precipitation technique and the Au supported samples were synthesized using depositionprecipitation with urea method. The physicochemical characterization was performed by XRD, ICP-AES, BET surface area, FT-IR, UV-Vis DRS, Raman Spectroscopy, TEM, and XPS techniques. Au/CeO 2 catalyst showed more than 80% CO conversions at 30 ∘ C, whereas Au/CeO 2 -ZrO 2 exhibited ∼100% CO conversion at that temperature. The catalytic performance of Au catalysts is highly dependent on the nature of the support.

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“…Pure CeO 2 shows no catalytic activity for the decomposition of N 2 H 4 systems, but the deposited metal nanoparticles modify its electronic properties and, as a consequence, increase its catalytic characteristics [9][10][11], although cerium oxide structures have been scarcely synthesized by the Hy-MWM [12][13][14][15][16][17]. Typically, the synthesis of ceria is performed at temperatures of 80-160°C under strong alkaline conditions with high power irradiations (300-900 W), varying the pressure (1.2-14 atm.).…”

Section: Introductionmentioning

confidence: 99%