Nanocatalysis on Tailored Shape Supports:  Au and Pd Nanoparticles Supported on MgO Nanocubes and ZnO Nanobelts

Glaspell, Garry; Hassan, Hassan M.A.; Elzatahry, Ahmed A.; Fuoco, Lindsay; Nr, Radwan; Ms, El-Shall

doi:10.1021/jp0651034

Cited by 64 publications

(53 citation statements)

References 41 publications

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“…Once being reactivated, the composite showed an activity close to the origin value with only a minor decrease. Similar phenomena of Au/oxide catalyst which deactived after storage in ambient environments and could be regenerated upon hightemperature calcinations were also addressed by other publications, which is ascribed to the necessary process of removal of moisture and adsorbed impurities on the nanocomposites [34,36].…”

Section: Nano Researchsupporting

confidence: 67%

“…Figure 6 shows the size effect of gold on CO conversion over Au/LaVO 4 catalyst calcined at 250 ˚C with the same Au loading amount of 3 wt%. The activities of LaVO 4 supported Au nanocatalyst for CO oxidation are comparable with that of Au nanocatalyst with some oxide supports [33,34]. As expected, the Au/LaVO 4 nanocomposite with different Au particle sizes and distributions have different activities.…”

Section: Nano Researchmentioning

confidence: 56%

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Au/LaVO4 Nanocomposite: Preparation, characterization, and catalytic activity for CO oxidation

et al. 2008

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The size of the gold particles is a very important parameter to get active catalysts. This paper reports a novel colloidal deposition method to prepare Au/LaVO 4 nanocomposite catalyst with monodispersed Au colloids and uniform LaVO 4 nanoplates in nonpolar solvent. Monodispersed Au colloids with tunable size (such as 2, 5, 7, 11, 13, and 16 nm) and LaVO 4 nanocrystals with well-defi ned shapes were pre-synthesized assisted with oleic acid/amine. During the following immobilization process, the particle size and shape of Au and LaVO 4 were nearly preserved. As-prepared Au/LaVO 4 nanocomposite showed high catalytic activity for CO oxidation at room temperature. Since sizes of gold particles were well-defi ned before the immobilization process, size effect of gold particles was easy to be investigated and the results show that 5-nm Au/LaVO 4 nanocomposite has the highest activity for CO oxidation. This synthetic method can be extended further for the preparation of other composite nanomaterials.

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Section: Nano Researchsupporting

confidence: 67%

Section: Nano Researchmentioning

confidence: 56%

Au/LaVO4 Nanocomposite: Preparation, characterization, and catalytic activity for CO oxidation

et al. 2008

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“…For instance, El-Shall and coworkers supported gold nanoparticles on MgO nanocubes and ZnO nanobelts using a conventional deposition -precipitation method. 92 The MgO nanocubes and ZnO nanobelts were synthesized by thermal evaporation of the metal powder (1190…”

Section: Gold Nanoparticles On Other Support Morphologiesmentioning

confidence: 99%

Gold Nanoparticles as Chemical Catalysts

Overbury

Dai

2005

Encyclopedia of Inorganic Chemistry

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Gold, often known as being chemically inert , has rich inorganic and organic chemistry. In particular, gold nanoparticles, either protected by organic ligands or supported on solid surfaces, have attracted wide attention for their applications in catalysis, electronics, nonlinear optics, and biology. In this article, we summarize some recent advances in the synthesis of supported gold catalysts from the perspective of inorganic materials chemistry. These advances include new methods used to load gold, to prepare functionalized supports, and to postdecorate supported gold catalysts. More recent advances in the use of nanoparticle supports and other ordered nanostructures in making supported gold catalysts are also highlighted, and a critical analysis of the status of the field is presented. From this review, it is hoped that the reader will get an impression that inorganic materials chemistry can contribute to the synthesis of novel gold catalysts with good catalytic performance.

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“…Examples include optical applications or biosensors based on the use of surface plasmon resonances that depend on the NPs morphology 1 or nanocatalysis in which the catalytic action depends on both the NP shape and the nature of the support or substrate. 2 However, controlling the shape of supported NPs by thinfilm technologies is generally difficult since it depends both on kinetic and thermodynamic parameters. 3 The NP equilibrium shape becomes generally defined by the surface energy of the substrate if it is isotropic ͑typically glassy or amorphous͒, whereas the energy balance depends additionally on crystal orientation in the case of single-crystalline substrates.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, MgO nanocubes have recently been synthesized and used as substrates allowing direct observation of the NPs in different orientations by transmission electron microscopy ͑TEM͒ with no further sample preparation. 2,3,14,15 This work reports a comparison study of Au NPs produced simultaneously on single-crystalline ͑MgO͒ and amorphous ͑carbon/glass͒ substrates by PLD. The ultimate aim is to investigate if PLD offers any advantage for promoting epitaxial growth or controlling the shape of metal NPs when compared to other techniques.…”

Section: Introductionmentioning

confidence: 99%

Role of substrate on nucleation and morphology of gold nanoparticles produced by pulsed laser deposition

et al. 2009

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This work compares the morphology of gold nanoparticles ͑NPs͒ produced at room temperature on singlecrystalline ͑MgO nanocubes and plates͒ and amorphous ͑carbon/glass plates͒ substrates by pulsed laser deposition ͑PLD͒. The results show that similar deposition and nucleation rates ͑Ͼ5 ϫ 10 13 cm −2 s −1 ͒ are achieved irrespective of the nature of the substrate. Instead, the shape of NPs is substrate dependent, i.e., quasispheres and faceted NPs in amorphous and single-crystalline substrates, respectively. The shape of the latter is octahedral for small NPs and truncated octahedral for large ones, with the degree of truncation being well explained using the Wulff-Kaichew theorem. Furthermore, epitaxial growth at room temperature is demonstrated for single-crystalline substrate. The large fraction of ions having energies higher than 200 eV and the large flux of species arriving to the substrate ͑10 16 at. cm −2 s −1 ͒ involved in the PLD process are, respectively, found to be responsible for the high nucleation rates and epitaxial growth at room temperature.

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Nanocatalysis on Tailored Shape Supports: Au and Pd Nanoparticles Supported on MgO Nanocubes and ZnO Nanobelts

Cited by 64 publications

References 41 publications

Au/LaVO4 Nanocomposite: Preparation, characterization, and catalytic activity for CO oxidation

Au/LaVO4 Nanocomposite: Preparation, characterization, and catalytic activity for CO oxidation

Gold Nanoparticles as Chemical Catalysts

Role of substrate on nucleation and morphology of gold nanoparticles produced by pulsed laser deposition

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