New metallic hollow double shells nanocatalysts were synthesized to examine the confinement of the reactants inside the cavity and to demonstrate the cage effect in hollow nanocatalysis. This involves: 1) the synthesis of hollow nanocatalysts with two surfaces, the outer surface is not reactive while the inner is e.g. Ag2O layer prepared inside gold nanocages. This catalyst has been examined in photocatalytic degradation of methyl orange dye. 2) Hollow nanoparticles having a plasmonic inner gold surface and a non-plasmonic outer catalytic layer were prepared. The shift in the surface plasmon spectrum during the catalytic reaction proved the cage effect. 3) Synthesis of two shell-shell hollow nanoparticles made of inner shell of Pt and outer shell of Pd and vice versa in addition to pure Pt and Pd nanocages. These nanocatalysts were used to catalyze the reduction of nitrophenol by borohydride. The kinetic parameters of the double shell catalysts are found to be the same as those of the pure nanocage made of the same metal as that of the inner shell of the inner shell.

Catalysis with unique hollow nanoparticles: Synthesis and evidence of the cage effect

244th National Meeting (2012)

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