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Mesoporous silica nanoparticles applied as a support for Pd and Au nanocatalysts in cycloisomerization reactions
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See supplementary material at http://dx.doi.org/10.1063/1.4901293
for HRSEM image of MSNs showing their morphology and sizes ranging from 28 to 45 nm; N2
adsorption-desorption isotherms of MSN and AmP-MSN with a specific surface area of 331 m2
, a total pore volume of 1.83 cm3
; the reconstructured tomogram of Pd loaded MSNs, which shows that the mesopores are open to the external surface of the MSNs; bright-field TEM image showing the Pd-MSNs used for electron tomography data collection and reconstruction of Movie S1; STEM image showing the Pd-MSNs used for electron tomography data collection and analysis; slices cut out from the reconstructed tomogram of Pd-MSNs, which indicates that the Pd nanoparticles are on the external surface of the MSNs; and Movie S2, electron tomography performed using STEM images, to locate the positions of the Pd nanoparticles.[Supplementary Material]
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Ultra-small mesoporous silica
nanoparticles (MSNs) have been synthesized at room temperature with particle sizes ranging from 28 to 45 nm. These MSNs have been employed as heterogeneous supports for palladium and gold nanocatalysts. The colloidal nature of the MSNs is highly useful for catalytic applications as it allows for better mass transfer properties and a more uniform distribution of the nanocatalysts in solution. The two nanocatalysts were evaluated in the cycloisomerization of alkynoic acids and demonstrated to produce the corresponding alkylidene lactones in good to excellent yields under mild conditions. In addition to their high activity, the catalysts exhibit low degree of metal leaching and straight-forward recycling, which highlight the practical utility of MSNs as supports for nanocatalysts.
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