Synthesis and characterization of nanocrystalline cerium oxide powders by two-stage non-isothermal precipitation

Chen, Huey-Ing; Chang, Hung-Yu

doi:10.1016/j.ssc.2004.12.020

Cited by 99 publications

(53 citation statements)

References 27 publications

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“…1), alumina exists in an amorphous state, cerium oxide exists in crystalline state of cubic fluorite structured CeO 2 (2ª = 28.6°, 33°, 47.4°, 56.3°, 59°, 69.4°, 76.7°and 79°). 13) The significantly weak intensity CeO 2 peaks in PtCu/CeAl catalyst indicated that the interaction of CeO 2 with Al 2 O 3 resulted in cerium oxide to be crystallized in small agglomerate. The XRD patterns of PtCu/CeAl and PtCu/ Ce showed very weak CuO reflections.…”

Section: Resultsmentioning

confidence: 99%

Kinetics of CO Oxidation over Pt-Modified CuO Nanocatalysts

et al. 2015

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Three Pt-CuO nanocatalysts PtCu/Al, PtCu/CeAl and PtCu/Ce have been successfully prepared. The characterization of the catalysts was examined by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray energy dispersive analysis (EDS), temperatureprogrammed reduction (TPR), nitrogen physisorption measurements, and IR-CO adsorption. The kinetics of CO oxidation using these catalysts was studied in a gradientless flow-circulating system at 398498 K. The obtained kinetic equation confirmed that the reaction proceeds in medium surface coverage with the participation of CO molecules and oxygen atoms.

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Section: Resultsmentioning

confidence: 99%

Kinetics of CO Oxidation over Pt-Modified CuO Nanocatalysts

et al. 2015

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“…On PtCu/Ce sample the values of agglomerates size of Pt and o , 69.4°, 76,7 o , 79° [15] and very weak peaks, characteristic of CuO, γ-Al 2 O 3, and Pt. However, the intensity of characteristic peaks of CeO 2 in PtCu/CeAl catalyst has been observed to be significantly weaker compared to those in the PtCu/Ce sample.…”

Section: Physico-chemical Characteristics Of Catalystsmentioning

confidence: 95%

The role of carriers in properties and performance of Pt-CuO nanocatalysts in low temperature oxidation of CO andp-xylene

Lộc¹,

Tri²,

Hoang³

et al. 2014

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Enhancement of water-gas shift reaction efficiency: catalysts and the catalyst bed arrangement Natal'ya A Baronskaya, Tat'yana P Minyukova, Aleksandr A Khassin et al. In this study four optimal catalysts on the basis of Pt-CuO supported on γ-Al 2 O 3 , TiO 2 , CeO 2 and γ-Al 2 O 3 + CeO 2 have been prepared and studied. Characterizations of the catalysts have been carried out by methods of N 2 adsorption, x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and temperatureprogrammed-reduction (TPR). The activity of these catalysts for deep oxidation of CO, p-xylene and their mixture was assessed at temperature range 75−300°C. The results showed that the presence of CO in a mixture with p-xylene has a beneficial effect on the rate of p-xylene conversion; meanwhile the presence of p-xylene shows the inhibition on CO oxidation. In the reactions of the mixture, oxidation of CO and p-xylene occurred simultaneously on PtCuO catalyst supported on γ-Al 2 O 3 , TiO 2 , CeO 2 carriers, but on catalyst PtCu/CeAl the oxidation of p-xylene can proceed only when CO is consumed entirely. Addition of 1.1 to 3.2% mol steam into the gas mixture exhibits no effect on the conversion of CO; meanwhile, it shows the limited effect on oxidation rate of p-xylene on hydrophobic catalysts (PtCu/Ce, PtCu/CeAl and PtCu/ Ti), but strong inhibition on hydrophilic catalyst (PtCu/Al). However, this negative effect of water was reversible.

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“…This type of simple synthesis offers great possibilities of choosing reaction conditions such as temperature, 4,[7][8][9][10][11][12] pH, 11,13,14 type of the Ce salt reactant, 11,13,15,16 co-reactant, 17 surfactant, 10,18 base, 9,19 or the precipitate aging time. 7,20 Precipitation synthesis of ceria can thus yield nanocrystals in the form of nanoparticles, nanocubes, nanofibers, nanorods, or nanotubes. The key parameters to control the morphology of ceria particles were pH of the reaction mixture, reaction temperature, and aging time.…”

Section: Introductionmentioning

confidence: 99%

“…Chen et al 20 prepared nanoparticle CeO 2 via precipitation synthesis from cerium(III) nitrate in the presence of ammonium hydroxide (pH = 10) at 70°C. Aging temperature had a significant effect on the shape of the particles.…”

Section: Introductionmentioning

confidence: 99%

Sintering of Ce, Sm, and Pr Oxide Nanorods

et al. 2016

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Synthesis of CeO 2 , Pr 2 O 3 , and Sm 2 O 3 nanorods and their sintering have been investigated. In a strongly alkaline medium, nanorods of CeO 2 , Pr 2 O 3 , and Sm 2 O 3 were prepared from trivalent salts of rare earths (Ce, Pr, Sm) via precipitation synthesis. Nanorods were formed by nanocrystallites of fibrous structure, which were produced by the mechanism of selfarrangement of hexagonal particles of Re(III) hydroxides. The subsequent transformation of hydroxide into oxide proceeded via self-preservation of the rod-like structure. In CeO 2 , the fibrous structure was noncohesive during thermal treatment at temperature of 500°C and higher. Regardless of the shape of the CeO 2 particles (spherical versus rod-like), sintered ceramic was formed by equiaxial grains. The cohesion of the fibrous structure of Pr and Sm oxides was higher than in CeO 2 . The rod-like shape of the particles of Pr and Sm oxides was (partially) preserved during sintering.

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Synthesis and characterization of nanocrystalline cerium oxide powders by two-stage non-isothermal precipitation

Cited by 99 publications

References 27 publications

Kinetics of CO Oxidation over Pt-Modified CuO Nanocatalysts

Kinetics of CO Oxidation over Pt-Modified CuO Nanocatalysts

The role of carriers in properties and performance of Pt-CuO nanocatalysts in low temperature oxidation of CO andp-xylene

Sintering of Ce, Sm, and Pr Oxide Nanorods

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