Nanocrystalline Ce1−xYxO2−x/2 (0≤x≤0.35) Oxides via Carbonate Precipitation: Synthesis and Characterization

Li, Ji‐Guang; Ikegami, Takayasu; Wang, Yarong; Mori, Toshiyuki

doi:10.1006/jssc.2002.9678

Cited by 70 publications

(58 citation statements)

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“…The result shown in Fig. 8 indicates that Ce 2 CO 3 3 was transformed to CeO 2 by calcination at 300c C. 26 Therefore, CO 2 gas evolved from contaminated Ce 2 CO 3 3 during calcination at 300c C partially destructed micropore structures, leaving the aggregates and macropores. For the reason why NH 4 HCO 3 and Na 2 CO 3 did not form Ce 2 CO 3 3 ெ8H 2 O, the pH of the solution of the former compound is so low that the concentration of carbonate ions seems to be too low for the formation of Ce 2 CO 3 3 ெ8H 2 O.…”

Section: Characterizationmentioning

confidence: 99%

“…The crystallite sizes were almost the same and were in a range of 4-5 nm. As the mean crystallite size of the colloidal particles before coagulation was about 2 nm, crystal growth of the CeO 2 nanoparticles occurred by the calcination at a low temperature of 300c C. 26 The BET surface areas were considerably different from sample to sample. The surface area calculated assuming that each CeO 2 particle is spherical with a diameter of 5 nm crystallite size should be 166 m 2 g, which is significantly larger than the observed surface areas.…”

Section: Characterizationmentioning

confidence: 99%

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Pore-Structure-Controlled Coagulates of CeO2 Nanoparticles for Supporting Ru Catalysts in Liquid Phase Oxidation of Benzyl Alcohol

Hayashi

Hosokawa

Imamura

et al. 2007

J. Ceram. Soc. Japan

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CeO 2 colloidal particles with a mean crystallite size of 2 nm synthesized by a solvothermal reaction were coagulated with 1 molL solutions of various bases: NaOH, NH 4 OH, Na 2 CO 3 , NH 4 2 CO 3 , NaHCO 3 , and NH 4 HCO 3 . The CeO 2 powders obtained by calcination of the coagulated products at 300? C had almost the same crystallite sizes in a range of 4-5 nm, while their BET surface areas were considerably different. The CeO 2 powders coagulated with Na 2 CO 3 and NH 4 OH had large surface areas due to micropores, and the powders obtained using NaHCO 3 and NH 4 2 CO 3 had large pore-volumes derived from macropores. A series of Ru CeO 2 catalysts were prepared by a precipitation-deposition method, and characteristics of the Ru species supported on these CeO 2 powders having different pore structures were examined in the liquid phase oxidation of benzyl alcohol. The Ru species having well-crystallized RuO 2 bulk state showed only low activities. On the other hand, well dispersed Ru species exhibited high activities. The pore structure of CeO 2 affected the states of the Ru species loaded, and, consequently, affected their activities for the oxidation. Ruthenium species were not loaded on the surface inside the micropores by the preparation method adopted in this work. Accordingly, the RuCeO 2 catalysts with large surface areas derived from meso-and macro-pores had well-dispersed Ru species and showed high activities, which were much higher than that of the RuCeO 2 catalyst prepared by a conventional co-precipitation method.

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Section: Characterizationmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Pore-Structure-Controlled Coagulates of CeO2 Nanoparticles for Supporting Ru Catalysts in Liquid Phase Oxidation of Benzyl Alcohol

Hayashi

Hosokawa

Imamura

et al. 2007

J. Ceram. Soc. Japan

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“…The authors have prepared fine Y 2 O 3 doped CeO 2 powders using carbonate co-precipitation method and examined its siterability before [13,14]. The carbonate coprecipitation method was useful method for preparation of fine Y 2 O 3 doped CeO 2 powders and sintered bodies with high density.…”

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confidence: 99%

Influence of nano-structural feature on electrolytic properties in Y₂O₃ doped CeO₂ system

Mori

Drennan

Wang

et al. 2003

Science and Technology of Advanced Materials

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“…4, which shows those particles are spherical in shape and sizes are in the range of nanoscale (< 100 nm), a morphology more suitable to consolidation and ceramic fabrication [42]. Thus, from XRD analysis and SEM image, formation of nanocrysralline CeO 2 was confirmed.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 65%

“…2. It can be seen that crystallite sizes exponentially increases with increasing calcination temperature, which indicates the crystalline coarsening process is related to diffusion [42]. Crystallite growth kinetic generally follows the empirical equation [43]:…”

Section: Xrd Analysismentioning

confidence: 99%

Preparation and Characterization of Nanocrystalline Cerium (IV) Oxide and Doped Cerium (IV) Oxide, Ce1-x-yMgxZryO2-?

Debnath

Tashmim

Rüscher³

et al. 2015

J. Sci. Res.

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Nanocrystalline cerium (IV) oxide is a technologically important material due to its high oxygen storage capacity, oxygen ionic conductivity and thermal stability. In this paper we report preparation of nanocrystalline CeO 2 using glycerin nitrate method, where the precursor obtained from the mixture of cerium nitrate and glycerin were calcined at temperatures ranging from 200°C to 800°C in steps of 100°C in a muffle furnace. Attempts were also made to prepare nanocrystalline cerium (IV) oxide doped with both Mg and Zr using the same method. The calcined specimens were characterized using XRD, FTIR and SEM/EDX analyses. The influence of the calcination temperature on the cubic phase formation and its consequent effect on the crystallite size of the prepared CeO 2 were studied and interpreted. The crystallite sizes calculated from XRD data using Scherrer formula reveal that the phases are nanocrystals, which was further supported by SEM photograph. The apparent activation energy for crystalline coarsening is found to be very low ) for this precursor compared to reported data. XRD data and also EDX analysis shows that both Mg and Zr could also be doped in CeO 2 upto a certain composition, Ce 1-x-y Mg x Zr y O 2-δ (x = 0.05, y = 0.05).

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Nanocrystalline Ce1−xYxO2−x/2 (0≤x≤0.35) Oxides via Carbonate Precipitation: Synthesis and Characterization

Cited by 70 publications

References 20 publications

Pore-Structure-Controlled Coagulates of CeO2 Nanoparticles for Supporting Ru Catalysts in Liquid Phase Oxidation of Benzyl Alcohol

Pore-Structure-Controlled Coagulates of CeO2 Nanoparticles for Supporting Ru Catalysts in Liquid Phase Oxidation of Benzyl Alcohol

Influence of nano-structural feature on electrolytic properties in Y₂O₃ doped CeO₂ system

Preparation and Characterization of Nanocrystalline Cerium (IV) Oxide and Doped Cerium (IV) Oxide, Ce<sub>1-x-y</sub>Mg<sub>x</sub>Zr<sub>y</sub>O<sub>2-?</sub>

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Nanocrystalline Ce1−xYxO2−x/2 (0≤x≤0.35) Oxides via Carbonate Precipitation: Synthesis and Characterization

Cited by 70 publications

References 20 publications

Pore-Structure-Controlled Coagulates of CeO2 Nanoparticles for Supporting Ru Catalysts in Liquid Phase Oxidation of Benzyl Alcohol

Pore-Structure-Controlled Coagulates of CeO2 Nanoparticles for Supporting Ru Catalysts in Liquid Phase Oxidation of Benzyl Alcohol

Influence of nano-structural feature on electrolytic properties in Y2O3 doped CeO2 system

Preparation and Characterization of Nanocrystalline Cerium (IV) Oxide and Doped Cerium (IV) Oxide, Ce<sub>1-x-y</sub>Mg<sub>x</sub>Zr<sub>y</sub>O<sub>2-?</sub>

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Influence of nano-structural feature on electrolytic properties in Y₂O₃ doped CeO₂ system