Preparation and characterization of ceria under an oxidizing atmosphere. Thermal analysis, XPS, and EPR study

Abi‐Aad, Edmond; Bechara, Rafeh; Grimblot, J.; Aboukaı̈s, Antoine

doi:10.1021/cm00030a013

Cited by 205 publications

(94 citation statements)

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“…The O 1s region of the metal-loaded CeO 2 nanorod and -cube catalysts (not shown here) evidence the presence of two oxidation states: one at 529.2 eV representing the oxygen anions of the ceria and one at 531.7 eV, appearing in some cases as a broad shoulder, attributed to hydroxyl groups on the surface. It has been reported that the peaks at 529.6, 530.3 and 532.7 eV are due to CeO 2 , Ce 2 O 3 and OH(a) (or some hydroxyl-containing oxide), respectively [57,58]. For all of the catalysts, reduction led to an increase of the hydroxyl species and a comparison of the spectra of nanorod and nanocube catalysts shows that the latter typically contains more of these hydroxyl groups than the former.…”

Section: Characterization Of the Catalystsmentioning

confidence: 89%

Nanostructured ceria supported Pt and Au catalysts for the reactions of ethanol and formic acid

Çiftçi

Ligthart

Pastorino

et al. 2013

Applied Catalysis B: Environmental

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Section: Characterization Of the Catalystsmentioning

confidence: 89%

Nanostructured ceria supported Pt and Au catalysts for the reactions of ethanol and formic acid

Çiftçi

Ligthart

Pastorino

et al. 2013

Applied Catalysis B: Environmental

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“…The additional signals with g-factors >2.0 that were observed for all glasses could be ascribed to the presence of oxygen defects (F-centers, non-bridging oxygen in the glass matrix, adsorbed and ionized oxygen) and were found in glasses of various composition [35,36]. Detectable EPR signals in this range with g-factors 1.9-2.0 were also characteristic for Ce 3+ ions formed in CeO 2 (without a glass matrix) during heat treatment [37][38][39]. However, such signals were not observed either for glass containing only CeO 2 (curve 2) or for glasses with both oxides (curve 3).…”

mentioning

confidence: 85%

Optical properties of Ce–Ti-containing silicate glasses

et al. 2009

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UDC 666.175.6;621.794.5;535.37 Silicate glasses doped with ceria and titania have been studied. Such co-doping determines the specific coloration of the glasses with adjustable absorption in the visible spectral region. Based on measurements of optical transmittance and photoluminescence and studies of electron paramagnetic resonance, it was established that the features of their optical properties are due to the formation of chromophore centers incorporating cerium and titanium ions.Introduction. Optical materials containing transition and rare-earth ions are widely used in optics and quantum electronics to fabricate laser glasses that are stable to the action of UV radiation and to develop thermally stable light filters, etc. Interest in the use of Ce and Ti compounds in optical materials grew because of their use to prepare yellowish-orange glasses with consistent optical characteristics and high thermal stability [1]. Such glasses are used to fabricate various items for household and technical purposes and to imitate precious stones. It is important to establish the nature of the coloring effect and the valence and coordination state of the Ce and Ti ions in glasses used as filters for light emitters in the electrical industry because the optical characteristics must be controlled and stabilized.Optical properties of glasses with both Ce and Ti oxides present in various proportions (silicate, phosphate, borate glasses and thin films) have been studied several times [2][3][4]. However, there are significant discrepancies in the explanation of the nature of the coloring and the determination of the valence state of the Ce and Ti ions in the glass matrix. According to one study [2], compounds such as Ce(TiO 3 ) 2 and Ce(Ti 2 O 5 ) 2 with tetravalent Ce and Ti are formed. Another study [3] explains the yellow color by the effect of Ce and Ti ions on the total optical absorption. Yet another study [4] linked the appearance of the characteristic yellowish-orange color in silicate glasses with Ce and Ti to the formation of colored complexes between Ce 3+ and Ti 4+ ions. The involvement of both CeO 2 and TiO 2 in

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“…The method described in this work produces Ce(OH) 3 nanotubes by using a simple hydrothermal alkali treatment of anhydrate cerium chloride at high temperature, followed by washing of the product with water and hydrochloric acid. Keeping in mind that trivalent cerium hydroxide is extremely sensitive to oxygen, [9] the filtration and washing processes were manipulated in a glove box under oxygen-free conditions. Before reaction, all solutions of NaOH, HCl, and distilled water were purged with a highly pure nitrogen flow in order to remove absorbed oxygen.…”

Section: Doi: 101002/adma200501557mentioning

confidence: 99%

Cerium Oxide Nanotubes Prepared from Cerium Hydroxide Nanotubes

et al. 2005

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Solvents were of the highest purity grade commercially available, and THF was freshly distilled over Na/benzophenone under a nitrogen atmosphere.Spectroscopic irradiations were performed using a low-output source (15 W) with emission centered at 300 nm in quartz cells 10 mm wide, equipped with a gas-tight rubber septum. Solutions (1.8 × 10-5 M) were equilibrated in air or thoroughly flushed by purging with argon for 15 min. Absorption spectra were recorded on a Varian 5000 UV-vis-near-IR spectrophotometer.Preparative irradiations were performed at room temperature, on 80 mL dichloromethane solutions of 1 (1.5 × 10 -3 M), using a highpressure Hg lamp (Helios Italquartz srl. 125 W) equipped with a glass cooling jacket, immersed in a borosilicate glass vessel under vigorous stirring. Nitrogen was gently purged for 30 min prior to the irradiation and the system was maintained under a nitrogen atmosphere during the reaction.Emission quantum yields were measured by means of a Varian Eclipse fluorimeter, for solutions with optical density ca. 0.1, using Cu II phtalocyanine in tetrahydrofuran as a reference standard. Corrections were performed for different refractive indexes of the solvents, for the optical density of the solutions, and for the different sensitivity of the photodetector.Cyclic voltammetry was performed in argon-flushed analyticalgrade dichloromethane solutions (4 × 10 -3 M), using a polished platinum working electrode, a platinum wire as the counter electrode and Ag/Ag + as the reference electrode. [(Bu) 4 N] + [PF 6 ] -was used as the supporting electrolyte and ferrocene was added as an internal reference. Scans were performed at 100 mV s

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Preparation and characterization of ceria under an oxidizing atmosphere. Thermal analysis, XPS, and EPR study

Cited by 205 publications

References 0 publications

Nanostructured ceria supported Pt and Au catalysts for the reactions of ethanol and formic acid

Nanostructured ceria supported Pt and Au catalysts for the reactions of ethanol and formic acid

Optical properties of Ce–Ti-containing silicate glasses

Cerium Oxide Nanotubes Prepared from Cerium Hydroxide Nanotubes

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