Shaped platinum nanoparticles directly synthesized inside mesoporous silica supports

Kim, Jiwhan; Bae, Yang‐Seop; Lee, Hyunjoo

doi:10.1039/c4nr03951c

Cited by 13 publications

(8 citation statements)

References 43 publications

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“…A capillary inclusion method was adapted to impregnate platinum nanoparticles inside mesoporous iron oxide material. [ 36 ] Platinum nanoparticles stabilized by PVP was dissolved in ethanol and mixed with a predetermined amount of mesoporous iron oxide material. The mixture was stirred for 30 min at 25°C to expand the distribution of platinum nanoparticles on the surface of mesoporous material.…”

Section: Experimental Sectionsmentioning

confidence: 99%

Methyl orange degradation enhanced by hydrogen spillover onto platinum nanocatalyst surface

Ilunga

Mamba

Nkambule

2020

Applied Organom Chemis

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Following a thermal reduction method, platinum nanoparticles were synthesized and stabilized by polyvinylpyrrolidone. The colloidal platinum nanoparticles were stable for more than 3 months. The micrograph analysis unveiled that the colloidal platinum nanoparticles were well dispersed with an average size of 2.53 nm. The sol-gel-based inverse micelle strategy was applied to synthesize mesoporous iron oxide material. The colloidal platinum nanoparticles were deposited on mesoporous iron oxide through the capillary inclusion method. The small-angle X-ray scattering analysis indicated that the dimension of platinum nanoparticles deposited on mesoporous iron oxide (Pt-Fe 2 O 3) was 2.64 nm. X-ray photoelectron spectroscopy (XPS) data showed that the binding energy on Pt-Fe 2 O 3 surface decreased owing to mesoporous support-nanoparticle interaction. Both colloidal and deposited platinum nanocatalysts improved the degradation of methyl orange under reduction conditions. The activation energy on the deposited platinum nanocatalyst interface (2.66 kJ mol −1) was significantly lowered compared with the one on the colloidal platinum nanocatalyst interface (40.63 ± 0.53 kJ mol −1).

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Section: Experimental Sectionsmentioning

confidence: 99%

Methyl orange degradation enhanced by hydrogen spillover onto platinum nanocatalyst surface

Ilunga

Mamba

Nkambule

2020

Applied Organom Chemis

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“…A wide variety of controlled methods to synthesize nanoparticles have been developed, and the literature on Pt systems is large and ever expanding. Among the typical methods for preparing Pt-based catalysts are solvothermal, , polyol reduction, chemical vapor deposition, , wet impregnation, , aqueous solution with different reducing agents (NaBH 4 , hydrazine, etc. ), flame aerosol, electromagnetic radiation assisted reduction, , etc.…”

Section: Introductionmentioning

confidence: 99%

“…4,8 Here, the overall driving factor is not only the inclusion of comparatively cheap Ru 1 but also its ability to greatly diminish the detrimental effect of Pt being poisoned by CO. 9 A wide variety of controlled methods to synthesize nanoparticles have been developed, and the literature on Pt systems is large and ever expanding. Among the typical methods for preparing Pt-based catalysts are solvothermal, 10,11 polyol reduction, 12 chemical vapor deposition, 13,14 wet impregnation, 15,16 aqueous solution with different reducing agents (NaBH 4 , hydrazine, etc. ), 6 flame aerosol, 17 electromagnetic radiation assisted reduction, 18,19 etc.…”

Section: ■ Introductionmentioning

confidence: 99%

Supercritical Flow Synthesis of Pt_1–xRu_xNanoparticles: Comparative Phase Diagram Study of Nanostructure versus Bulk

et al. 2017

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The thermodynamic stability of nanocrystals is different from bulk systems, and nanoscale phase diagrams are to a large degree unknown. Here we present a systematic investigation of the Pt1-xRux phase diagram through supercritical flow-synthesis of Pt1-xRux nanoparticles across the entire compositional range. The synthesis was done in stoichiometric steps of 0.1 using an ethanol-toluene mixture as solvent at 450°C and 200 bar. The products were characterized by high resolution synchrotron powder X-ray diffraction, transmission electron microscopy and elemental mapping of individual particles using energy-dispersive X-ray spectroscopy. The diffraction data revealed a single phase fcc alloy for x ≤ 0.2, while an additional hcp phase emerges as x approaches 1. This behavior deviates significantly from the bulk phase diagram where a biphasic region is only observed 2 for 0.62 < x < 0.8. Thus, compositional design of Pt-Ru alloys is more flexible on the nanoscale opening up significant possibilities for catalyst optimization. Rietveld refinements and microstructural line profile analysis show that the fcc unit cell dimensions follow Vegard's law within a good approximation. On the other hand, crystallite size, microstrain, phase content and hcp c/a ratio depend non-linearly on x but shows some correlation to the bulk phase diagram. Elemental mapping show the nanoparticles to be homogeneous, but in some cases fcc-hcp phase boundaries and modulations in the elemental distribution were observed. All samples below x < 0.3 exhibit a spherical morphology. At higher ruthenium content, x ≥ 0.3, another morphology emerges with elongated particles together with the dominating spherical mophology.The TEM average particle sizes ranging from 5.0(8) to 10.4(7) nm.

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“…For a simple demonstration, the mesoporous silica prepared by single-source strategy was fabricated into a support material for metal nanoparticle catalyst. ,− We synthesized platinum nanoparticles by reducing H 2 PtCl 4 in the nanosized pores of C1 and characterized the supported catalyst Pt@C1 by WAXD (Figure b) and TEM (Figure S18). Highly dispersed Pt(0) nanoparticles were identified.…”

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confidence: 99%

Ordered Mesoporous Silica Pyrolyzed from Single-Source Self-Assembled Organic–Inorganic Giant Surfactants

et al. 2021

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We report the preparation of hexagonal mesoporous silica from single-source giant surfactants constructed via dihydroxyl-functionlized polyhedral oligomeric silsesquioxane (DPOSS) heads and a polystyrene (PS) tail. After thermal annealing, the obtained well-ordered hexagonal hybrid was pyrolyzed to afford well-ordered mesoporous silica. A high porosity (e.g., 581 m 2 /g) and a uniform and narrow pore size distribution (e.g., 3.3 nm) were achieved. Mesoporous silica in diverse shapes and morphologies were achieved by processing the precursor. When the PS tail length was increased, the pore size expanded accordingly. Moreover, such pyrolyzed, ordered mesoporous silica can help to increase both efficiency and stability of nanocatalysts.

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Shaped platinum nanoparticles directly synthesized inside mesoporous silica supports

Cited by 13 publications

References 43 publications

Methyl orange degradation enhanced by hydrogen spillover onto platinum nanocatalyst surface

Methyl orange degradation enhanced by hydrogen spillover onto platinum nanocatalyst surface

Supercritical Flow Synthesis of Pt_1–xRu_xNanoparticles: Comparative Phase Diagram Study of Nanostructure versus Bulk

Ordered Mesoporous Silica Pyrolyzed from Single-Source Self-Assembled Organic–Inorganic Giant Surfactants

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Shaped platinum nanoparticles directly synthesized inside mesoporous silica supports

Cited by 13 publications

References 43 publications

Methyl orange degradation enhanced by hydrogen spillover onto platinum nanocatalyst surface

Methyl orange degradation enhanced by hydrogen spillover onto platinum nanocatalyst surface

Supercritical Flow Synthesis of Pt1–xRuxNanoparticles: Comparative Phase Diagram Study of Nanostructure versus Bulk

Ordered Mesoporous Silica Pyrolyzed from Single-Source Self-Assembled Organic–Inorganic Giant Surfactants

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Supercritical Flow Synthesis of Pt_1–xRu_xNanoparticles: Comparative Phase Diagram Study of Nanostructure versus Bulk