Hydrothermal synthesis and characterization of rare earth doped ceria nanoparticles

Tok, Alfred Iing Yoong; Du, S.W.; Boey, Freddy; Chong, Wee Kiang

doi:10.1016/j.msea.2007.02.083

Cited by 110 publications

(48 citation statements)

References 26 publications

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“…37 For example, in the oxidation of toluene oxygen vacancies contribute to the activation of the substrate via surface oxygen vacancies, and the migration of bulk oxygen to the surface. 53 The concentration of Ce 3+ has also been correlated with the adsorption of molecular oxygen by ceria and formation of superoxide species on the surfaces of ceria, and has been linked to the observed high catalytic oxidation activity of ceria in some oxidation reactions. 62 Interestingly we note, in regard to the difference in TOF between Au-Pd/Ce-NR and Au-Pd/CeO 2 , that in addition to the proportion of Ce 3+ being slightly higher in the former, the difference in surface areas, Table 1, implies that there are a much greater number of Ce 3+ and surface oxygen vacancies in Au-Pd/Ce-NR giving a greater potential for oxygen activation.…”

Section: Catalytic Activity Measurementmentioning

confidence: 99%

“…The presence of high amounts of Ce 3+ is associated with surface oxygen vacancies and surface defects, and as noted above plays a crucial role in the catalytic activity of ceriabased materials. 53 Au-Pd/Ce-NR was found to display a higher amount of the non-stoichiometric cerium Ce 3+ compared to Au-Pd/CeO 2 . Although the difference is not too large, it is consistent with the higher activity observed for this catalyst as discussed in the next section.…”

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confidence: 91%

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Au–Pd NPs immobilised on nanostructured ceria and titania: impact of support morphology on the catalytic activity for selective oxidation

Khawaji

Chadwick

2018

Catal. Sci. Technol.

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Bimetallic Au-Pd nanoparticles supported on different ceria and titania nanostructures have been prepared by sol-immobilisation, and evaluated in the solvent-less selective oxidation of benzyl alcohol. The catalysts were characterised by TEM, STEM, XRD, XPS, ICP-AES, and nitrogen adsorption-desorption measurements.The activity of the catalysts was found to be strongly related to the morphology, structure and physiochemical properties of the supports. Au-Pd/ceria nanorods exhibited remarkably high catalytic activity (TOF > 35 900 h −1 ), and was found to be considerably more active than Au-Pd/titanate nanotubes, and Au-Pd catalysts supported on conventional ceria and titania nanopowders. The outstanding catalytic performance of Au-Pd/ceria nanorods is attributed to the unique surface chemistry of ceria nanorods, and the ability of catalyst preparation method (i.e. sol-immobilisation) to control the metal particle size and the bimetallic alloy formation. The presence of surface defects and high concentration of oxygen vacancies and Ce 3+ in ceria nanorods is likely responsible for the stabilisation of Au-Pd NPs during sol-immobilisation, which led to a very small mean particle size (2.1 nm) corresponding to a dispersion of approximately 52%, and a high surface metal concentration.

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Section: Catalytic Activity Measurementmentioning

confidence: 99%

mentioning

confidence: 91%

Au–Pd NPs immobilised on nanostructured ceria and titania: impact of support morphology on the catalytic activity for selective oxidation

Khawaji

Chadwick

2018

Catal. Sci. Technol.

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“…There is a wide range of applications for pure and doped ceria (CeO 2 ) such as electrolyte and barrier layers for solid oxide fuel cells (SOFCs) [1,2], catalysts for the treatment of automotive exhaust gases, petroleum cracking catalyst and gas sensor [3,4], polishing materials [5], oxygen pumps, ampere metric oxygen monitors [6,7] and optical films [8] because of their remarkable properties such as high oxygen storage capability [9,10] and ionic conductivity [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of rare earth dopants on structural and mechanical properties of nanoceria synthesized by combustion method

Akbari‐Fakhrabadi

Meruane

Jamshidijam

et al. 2016

Materials Science and Engineering: A

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. E-mail: aliakbarif@ing.uchile.cl Abstract Structural characteristics of combustion synthesized, calcined and densified pure and doped nanoceria with tri-valent cations of Er, Y, Gd, Sm and Nd were analyzed by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The results showed that the as-synthesized and calcined nanopowders were mesoporous and calculated lattice parameters were close to theoretical ion-packing model. The effect of dopants on elastic modulus, microhardness and fracture toughness of sintered pure and doped ceria were investigated. It was observed that tri-valent cation dopants increased the hardness of the ceria, whereas the fracture toughness and elastic modulus were decreased.

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“…FIGURE 2.5 -TEM images of the CeO2 nanoparticles (a and b), nanorods (c and d) and nanowires (e and f) (Tana, 2009 Agglomeration usually increases with decrease in particle size due to higher surface energy (Tok, 2007). Nanoplates synthesized by NH 4 OH also exhibit the lattice planes We can see that ceria nanocubes can also be fabricated either using a C NaOH = 9 M at The N 2 adsorption-desorption isotherm plots are illustrated in IUPAC.…”

Section: Sodium Hydroxidementioning

confidence: 99%

“…Theoretically, BET specific surface area should increase with the decrease in crystallite size (Tok, 2007). However, this theory only applies to nanorods and nanoplates.…”

Section: (A) (B)mentioning

confidence: 99%

Synthesis and characterization of ceria nanomaterials.

Ng¹

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Cerium dioxide or ceria, CeO 2, has been widely used in industry as catalyst for automotive exhaust controls, chemical mechanical polishing (CMP) slurries, and high temperature fuel cells because of its unique metal oxide properties. This well-known rare metal oxide has high thermal stability, electrical conductivity and chemical diffusivity.Proper synthesis method requires knowledge of reaction temperature, concentration, and time effects on the synthesis. In this work, ceria nanomaterials were prepared via the hydrothermal method using a Teflon autoclave. Cerium nitrate solution was used as the source and three different precursors: NaOH, H 2 O 2 , and NH 4 OH were used as the oxidizing agents. CeO 2 nanoplates, nanocubes and nanorods were produced and studied using transmission electron microscopy (TEM), BET specific surface area, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). concentration and exposed surface of crystalline planes suggest that nanorods are better catalyst for CO oxidation and oxygen storage capacity (OSC).

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Hydrothermal synthesis and characterization of rare earth doped ceria nanoparticles

Cited by 110 publications

References 26 publications

Au–Pd NPs immobilised on nanostructured ceria and titania: impact of support morphology on the catalytic activity for selective oxidation

Au–Pd NPs immobilised on nanostructured ceria and titania: impact of support morphology on the catalytic activity for selective oxidation

Effect of rare earth dopants on structural and mechanical properties of nanoceria synthesized by combustion method

Synthesis and characterization of ceria nanomaterials.

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