Reduced Transition Metal Colloids:  A Novel Family of Reusable Catalysts?

Roucoux, Alain; Schulz, Jürgen; Patin, Henri

doi:10.1021/cr010350j

Cited by 1,824 publications

(995 citation statements)

References 376 publications

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“…Silver is preferred since it is relatively affordable compared to the other noble metals. Ag possesses bactericidal property and it also possesses preferential oxygen adsorption quality [10][11][12][13][14][15]. The thickness of the depletion layer and space charge region is influenced by the size of the deposited metal nanoparticles and hence the present research attempts an elaborate study on the mechanism of an interfacial electron transfer at the heterojunctions.…”

Section: Introductionmentioning

confidence: 99%

Silver metalized mixed phase manganese-doped titania: Variation of electric field and band bending within the space charge region with respect to the silver content

Nagaraj

Devi

2014

Journal of Molecular Catalysis A: Chemical

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a b s t r a c tSilver was deposited on manganese-doped titanates (Mn-TiO 2 ) by photoinduced deposition method. The catalyst shows enhanced photocatalytic activity due to the synergistic effect of bicrystalline framework of anatase and rutile structures with high intimate contact due to the similarity in their crystallite sizes. The deposited metal nanostructures help in the formation of resonant surface plasmons in response to a photon flux, localizing the electromagnetic energy close to their surfaces. Better charge separation is achieved near the semiconductor surface due to the localized field. Silver deposition was varied from 0.1 to 1.5% on the surface of Mn-TiO 2 . The mechanism of interfacial electron transfer at heterojunctions in mixed phase induced by the plasmonic catalysis is explained. The extent of band bending, the variation of potential field in the space charge region with respect to the size of the deposited Ag metal particles is discussed. The photocatalytic activity of silver deposited Mn-TiO 2 was evaluated by taking resorcinol (Rs) as the model compound along with oxidants such as hydrogen peroxide (H 2 O 2 ) and ammonium per sulfate (APS) under UV/solar light illumination. The electronic level of the dopant, high intimate contact between the anatase and rutile phases along with efficient electron trapping by silver particles, plays a significant role in the photocatalytic process.

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Section: Introductionmentioning

confidence: 99%

Silver metalized mixed phase manganese-doped titania: Variation of electric field and band bending within the space charge region with respect to the silver content

Nagaraj

Devi

2014

Journal of Molecular Catalysis A: Chemical

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“…The resulting adsorption of macromolecules onto the surfaces of the nanoparticles provides a protective layer against agglomeration by restricting the motion of the colloid in the space between the particles. This causes both a decrease in entropy and an increase in free energy (Roucoux et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Size control of carbon-supported platinum nanoparticles made using polyol method for low temperature fuel cells

Favilla

Acosta

Schvezov

et al. 2013

Chemical Engineering Science

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Size control of carbon-supported platinum nanoparticles made using polyol method for low temperature fuel cells, Chemical Engineering Science, http://dx.doi.org/10.1016/j.ces. 2013.05.067 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. AbstractThe aim of this work is to present the results of the synthesis of Pt nanoparticles using the modified polyol method, using carbon black powder Vulcan XC-72R as a support. Two different techniques were used to synthesize the catalysts: a) fixing the initial concentration of the precursor (2 mM in H 2 PtCl 6 ) while adding the required amount of support to obtain different nominal loads of platinum; b) changing the initial concentration of the precursor to obtain altogether 10 wt.% nominal load of platinum. Catalysts were characterized using X-ray diffraction, transmission electron microscopy and cyclic voltammetry. The particles obtained ranged in sizes between 2.2 and 6.2 nm. These sizes were controlled by the initial concentration of the precursor. It has been found that the concentration of nanoparticles formed during synthesis was the same regardless of a) the initial concentration of the precursor and b) the amount of carbon support. In order to explain experimental results a new and simple statistical and geometrical treatment is used.

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“…[1,2] Among the other metals, silver is particularly attractive because of its significantly wide spread applications in optics, [3] electronics, [4] biology, [5] and catalysis. [6] In particular, its application in catalysis is important since it often combines the characteristics of high reactivity and selectivity. There are many reactions catalyzed by metallic silver such as oxidative conversion of methanol into formaldehyde, [7] selective butadiene epoxidation, [8] and oxidation of D-glucose.…”

Section: Introductionmentioning

confidence: 99%

“…There are many reactions catalyzed by metallic silver such as oxidative conversion of methanol into formaldehyde, [7] selective butadiene epoxidation, [8] and oxidation of D-glucose. [6] High efficiency in catalysis often requires a uniform size and a homogeneous distribution throughout a suitable substrate. Control over size of nanoparticles and of agglomeration are key points in the preparation of catalytic particles.…”

Section: Introductionmentioning

confidence: 99%

Glycidyl‐Methacrylate‐Based Electrospun Mats and Catalytic Silver Nanoparticles

Demir

Uǧur

Gülgün

et al. 2008

Macro Chemistry & Physics

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P(AN‐GMA) and PGMA fibers coated with monodisperse silver nanoparticles have been prepared by a combination of electrospinning and electroless plating. The morphology of the electrospun fibers remains unchanged after surface hydrazination. Oxidation of hydrazine in an ammoniacal solution of AgNO3 reduces and deposits silver atoms along the fiber surface, which then coalesce to Ag particles. The size of the silver nanoparticles is varied between 20–60 nm. Since the density of the active sites for silver reduction is lower in P(AN‐GMA), a smaller particle size could be obtained. The catalytic activity of the silver nanoparticles has been confirmed.magnified image

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Reduced Transition Metal Colloids: A Novel Family of Reusable Catalysts?

Cited by 1,824 publications

References 376 publications

Silver metalized mixed phase manganese-doped titania: Variation of electric field and band bending within the space charge region with respect to the silver content

Silver metalized mixed phase manganese-doped titania: Variation of electric field and band bending within the space charge region with respect to the silver content

Size control of carbon-supported platinum nanoparticles made using polyol method for low temperature fuel cells

Glycidyl‐Methacrylate‐Based Electrospun Mats and Catalytic Silver Nanoparticles

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