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Abstract
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An efficient heterogeneous palladium catalyst
system has been developed based on immobilization of Pd
nanoparticles on silica-bonded N-propylpiperazine sodium
N-propionate (SBPPSP) substrate. SBPPSP substrate can
stabilize the Pd nanoparticles effectively so that it can
improve their stability against aggregation. In addition,
grafted piperazine species on to the silica backbone prevent
the removing of Pd nanoparticles from the substrate surface.
Transmission electron microscopy (TEM) of catalyst
is shown the size of Pd nanoparticles, also it confirmed by
particle size analyzer which shown the average size of
21 nm for Pd. The catalytic activity of these catalysts was
investigated in the Sonogashira reaction. The catalyst could
be recycled several times without appreciable loss in catalytic
activity.
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