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HASHEMI ET AL.
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was investigated in the model reaction. After completion
of the reaction which was monitored by TLC, Ag/N‐CS‐1
nanospheres was filtered simply, washed with aqueous
NaOH, ethanol and hot water. Obtained catalyst was then
dried at 70 °C for 4 hr. The catalyst was used at least in 6
successful runs (Figure 3a). Based on ICP‐OES results the
Ag content of Ag/N‐CS‐1 after 6 successful runs was
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7
.2 wt%. This result indicates that about 0.4 wt% of Ag
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NPs were leached after 6 recycle which is a very small
amount. The TEM image of catalyst was measured after
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6
runs (Figure 3b). No aggregation of nanoparticles or
integrity of carbon nanospheres was observed. Probably
the observed decrease in activity of catalyst was due to
the catalyst poisoning.
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| CONCLUSION
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To sum up, in the present study we synthesized Tunable
N‐doped carbon nanospheres from sucrose as carbon
source and TAEA as nitrogen source by a simple and eas-
ily reproducible method. The content of doped nitrogen,
Surface area, pore volume and pore size of carbon spheres
were increased with the increasing of TAEA amount in
the hydrothermal process. Prepared N‐doped carbon
spheres can act as solid ligand for immobilization of Ag
NPs. It was found that benzylic alcohols and aldehydes
could be easily converted into aryl nitriles by using
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Ag/N‐CS‐1 nanospheres as the catalyst and O as the
oxidant.
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ACKNOWLEDGEMENTS
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The authors gratefully acknowledged for partially finan-
cial support of this study by Ferdowsi University of
Mashhad (Grant No: 3/47180).
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