Effect of synthesis method on structural properties and soot oxidation activity of gadolinium-doped ceria

Anantharaman, Anjana P.; GADIYAR, H; Surendran, Mythili; Rao, A. Sumadhura; Dasari, Hari Prasad; Dasari, Harshini; Babu, G. Uday Bhaskar

doi:10.1007/s11696-018-0532-5

Cited by 11 publications

(8 citation statements)

References 37 publications

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“…Mixtures of additives have also been investigated, such as polyvinylpyrrolidone, HCl, KClO 3 and N,N-dimethylformamide [132], octadecylamine, ethanol and ethylenediamine [133] or 6-amino hexanoic acid and tert-butylamine [134], and non-aqueous solvents have been studied, such as ethylene glycol [135][136][137][138], ethanol [139] and triethylene glycol [140]. In some cases, the choice of combination of additive and solvent has led to some striking crystal morphologies; for example, the combination of epigallocatechin-3-gallate in ethanol as a solvent allowed the formation of hierarchical nanostructures of Eu-containing CeO 2 with flower-like shapes of intergrown plates, microns in thickness, Figure 17 [141].…”

Section: Rare Earth-substituted Ceriamentioning

confidence: 99%

“…Applications of rare earth-substituted ceria materials span the types of fields expected for these materials, from oxide ion conductors in solid oxide fuel cells, where the enhanced sinterability of fine powders into ceramics is beneficial [136,137,143,149,150], to catalysts for CO and soot oxidation, where the high surface and exposure of specific crystal faces may offer some benefits [103,105,107,108,113,115,132,133,135,[150][151][152][153]. Photocatalytic properties are of increasing focus for degradation of pollutants or organic transformations, and some of the rare earth-substituted materials have been screened for these applications [101,124,141,154].…”

Section: Rare Earth-substituted Ceriamentioning

confidence: 99%

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Solvothermal Synthesis Routes to Substituted Cerium Dioxide Materials

et al. 2021

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We review the solution-based synthesis routes to cerium oxide materials where one or more elements are included in place of a proportion of the cerium, i.e., substitution of cerium is performed. The focus is on the solvothermal method, where reagents are heated above the boiling point of the solvent to induce crystallisation directly from the solution. This yields unusual compositions with crystal morphology often on the nanoscale. Chemical elements from all parts of the periodic table are considered, from transition metals to main group elements and the rare earths, including isovalent and aliovalent cations, and surveyed using the literature published in the past ten years. We illustrate the versatility of this synthesis method to allow the formation of functional materials with applications in contemporary applications such as heterogeneous catalysis, electrodes for solid oxide fuel cells, photocatalysis, luminescence and biomedicine. We pick out emerging trends towards control of crystal habit by use of non-aqueous solvents and solution additives and identify challenges still remaining, including in detailed structural characterisation, the understanding of crystallisation mechanisms and the scale-up of synthesis.

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Section: Rare Earth-substituted Ceriamentioning

confidence: 99%

Section: Rare Earth-substituted Ceriamentioning

confidence: 99%

Solvothermal Synthesis Routes to Substituted Cerium Dioxide Materials

et al. 2021

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“…2 demonstrates the Raman spectra for Ce and Nb‐Ce series. The most intense peak (F 2g ) is located at about 460 cm −1 and is ascribed to the symmetric stretch mode of the O–Ce–O and is a typical characteristic of the fluorite lattice structure CeO 2 10, 35. All the CeO 2 samples doped with Nb displayed the characteristic F 2g peak, and there was no change in the peak position up to 20Nb‐Ce.…”

Section: Resultsmentioning

confidence: 96%

“…Most of the metals doped with CeO 2 reported in various works enhanced the catalytic activity significantly [9,18,[21][22][23][24][25][26]28]. On the other hand, few metal oxides doped with CeO 2 did not considerably reduce the temperature required for soot combustion compared to the pure CeO 2 catalyst [21,27].…”

Section: Introductionmentioning

confidence: 99%

“…CeO 2 when doped with rare earth materials and lanthanides such as praseodymium (Pr) [33][34][35], lanthanum (La) [2], gadolinium (Gd) [35,36], samarium (Sm) [19,37], and neodymium (Nd) [21] provided excellent performance for soot oxidation activity. It showed an evident reduction in temperature required for oxidation of soot when compared to undoped/ pure CeO 2 and bare soot [33].…”

Section: Introductionmentioning

confidence: 99%

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A Negative Effect of Niobium‐Doped Ceria on Soot Oxidation Activity^‡

et al. 2022

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Niobium-doped ceria catalysts were synthesized to study soot oxidation activity. X-Ray diffraction (XRD) and Raman analysis of the samples revealed the presence of a fluorite structure of CeO 2 for all the doped samples. The T 50 temperature of the pure CeO 2 sample was more significant than that of bare soot. The high catalytic activity of the CeO 2 catalyst can be attributed to the low crystallite size, high facet ratio, and the large Brunauer-Emmett-Teller (BET) surface area as compared to Nb-doped samples. The activation energy calculated by both Ozawa and KAS methods were found to be low for CeO 2 when compared to Nb-doped samples. CeO 2 resulted in better soot oxidation activity with low activation energy.

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