Ultimate size control of encapsulated gold nanoparticles

Li, Shiwen; Burel, L.; Aquino, Cindy; Tuel, A.; Morfin, F.; Rousset, J.L.; Farrusseng, David

doi:10.1039/c3cc44843f

Cited by 76 publications

(68 citation statements)

References 31 publications

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“…In the case of noble metal encapsulation in hollow silicalite-1 and with comparable metal loading, Au and Pt@Sil-1 materials showed a single particle inside the big unique cavity of the crystal (ESI Fig.S1). 25,26 In contrast, for Co containing hollow zeolite samples, many particles are observed in the internal cavities ( Fig. 1-c,d).…”

Section: Cobalt Encapsulated In Hollow Silicalite-1mentioning

confidence: 89%

“…25,26 Typically, one gram of zeolite was suspended in 4.15 mL 1M TPAOH solution and 3.35 mL H 2 O and then the mixture was heated at 170°C under static conditions for 24 hours.…”

Section: Formation Of Hollow Structuresmentioning

confidence: 99%

“…25,26 In the following, we thoroughly describe the synthesis and characterization of Co@Sil-1(2.5) sample (Table 1) which is representative of the cases of other transition metals (summarized hereafter). As reported in our previous publications, silicalite-1 crystals are not stable at high temperature under highly alkaline pH conditions.…”

Section: Cobalt Encapsulated In Hollow Silicalite-1mentioning

confidence: 99%

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Transition-Metal Nanoparticles in Hollow Zeolite Single Crystals as Bifunctional and Size-Selective Hydrogenation Catalysts

et al. 2014

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Transition-metal nanoparticles (Co, Ni, and Cu) encapsulated in hollow zeolite single crystals were prepared by recrystallization of impregnated bulk MFI crystals in the presence of tetrapropylammonium (TPAOH) solutions. The size and number of particles in hollow MFI depended mainly on the aluminum content. The encapsulation of the nanoparticles prevented them from growing, thus enabling the control of particle size even after high temperature treatments. For low metal loadings (<3 wt %), the mean particle sizes for Co, Ni, and Cu in hollow silicalite-1 were 3.5 ± 0.3, 3.1 ± 0.5, and 1.5 ± 0.2 nm, respectively. In the case of hollow ZSM-5, higher loadings (∼8 wt %) could be obtained with mean particle sizes of 17 ± 2 nm, 13 ± 2 nm, and 15 ± 2 nm for Co, Ni, and Cu systems. The mechanism of transition metal nanoparticle formation was markedly different from that of noble metals. At high pH values, transition-metal cations first reacted with dissolved silica species yielding fibrous metal phyllosilicates that were located inside the crystal cavities. The metal phyllosilicates were then converted into nanoparticles upon reduction under H2 at high temperature (500–750 °C). Silicalite-1 encapsulated Ni particles were used in the catalytic hydrogenation of substituted benzenes and showed an outstanding size-selectivity effect. Ni particles were accessible to toluene but not to mesitylene, confirming that the activity is directly related to the diffusion properties of molecules through the zeolite membrane.

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Section: Cobalt Encapsulated In Hollow Silicalite-1mentioning

confidence: 89%

“…25,26 Typically, one gram of zeolite was suspended in 4.15 mL 1M TPAOH solution and 3.35 mL H 2 O and then the mixture was heated at 170°C under static conditions for 24 hours.…”

Section: Formation Of Hollow Structuresmentioning

confidence: 99%

Section: Cobalt Encapsulated In Hollow Silicalite-1mentioning

confidence: 99%

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Transition-Metal Nanoparticles in Hollow Zeolite Single Crystals as Bifunctional and Size-Selective Hydrogenation Catalysts

et al. 2014

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“…reported the synthesis of size‐controlled metal nanoparticles (e.g., Au, Pt, Co, Ni, etc.) encapsulated in hollow silicalite‐1 zeolite yolk–shell materials through a process involving metal‐ion impregnation, tetrapropylammonium hydroxide (TPAOH) treatment, and H 2 reduction . However, by using this method most of the hollow shells contained only one metal nanoparticle.…”

Section: Methodsmentioning

confidence: 99%

Palladium Nanoparticles Encapsulated in a Silicalite‐1 Zeolite Shell for Size‐Selective Catalysis in Liquid‐Phase Solution

Liu

Yang

et al. 2016

ChemCatChem

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Size‐selective catalysis is of great significance in both fundamental research and industrial applications. One well‐known example is zeolite‐based catalysts, which show remarkable size selectivity in gas‐phase reactions. However, very few of these catalysts are realized in liquid‐phase solution. Herein, we report an efficient route to produce a composite composed of Pd nanoparticles encapsulated in a silicalite‐1 zeolite shell. This composite shows sharp size‐selective catalysis in the hydrogenation of olefin aldehydes in aqueous solution. Owing to the pore‐size limitation of the silicalite‐1 zeolite shell (0.53×0.56 nm), the catalyst shows high activity in the hydrogenation of 3‐methyl‐2‐butenal (0.38×0.62 nm) and cinnamaldehyde (0.54×0.92 nm) but no activity for the hydrogenation of 3,3‐diphenylacrylaldehyde (0.81×1.0 nm). A catalyst with this type of structure can be applied to load other metal nanoparticles and can serve as a useful platform to study heterogeneous size‐selective catalysis in liquid solution.

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“…Our approach could be an alternative to the accurate tuning of reaction processes and parameters, or to external confinements such as the use of templates. [11][12][13][14][15] Indeed, our coatings produced uniform particle sizes and clean nanoparticle surfaces, free of surfactants and reducing agents. The last characteristic is a result of the extremely rapid and uniform reduction.…”

mentioning

confidence: 99%

Optimization of gold nanoparticle photoluminescence by alkanethiolation

et al. 2015

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Surface thiolation affects the size of gold nanoparticles and the presence of visible luminescence under UV stimulation. We explored these phenomena by analysing alkanethiolate coatings with different carbon chain lengths, from 3-mercaptopropionic acid to 16-mercaptohexadecanoic acid, synthesized by intense X-ray irradiation. Photoluminescence is present for the smallest nanoparticles, but its intensity becomes more intense as the carbon chain length increases, achieving a quantum efficiency of 28% with a 16-mercaptohexadecanoic acid coating.

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Ultimate size control of encapsulated gold nanoparticles

Cited by 76 publications

References 31 publications

Transition-Metal Nanoparticles in Hollow Zeolite Single Crystals as Bifunctional and Size-Selective Hydrogenation Catalysts

Transition-Metal Nanoparticles in Hollow Zeolite Single Crystals as Bifunctional and Size-Selective Hydrogenation Catalysts

Palladium Nanoparticles Encapsulated in a Silicalite‐1 Zeolite Shell for Size‐Selective Catalysis in Liquid‐Phase Solution

Optimization of gold nanoparticle photoluminescence by alkanethiolation

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