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We report on the fabrication of a new complex catalytic system composed of silica-supported silver nanoparticles (AgNP) encapsulated inside polymer microcapsules (MC)s. The silver nanocatalyst itself was obtained by reduction of silver salt in the presence of SiO2 particles acting as AgNP carriers, to provide a complex Ag/SiO2 catalyst with the Ag surface completely free of capping agents. Ag/SiO2 particles were enclosed inside the interior of polymer microcapsules. Due to the presence of the hydrophobic shell on the MC surface, catalytic reactions become feasible in an organic solvent environment. On the other hand, the hydrophilic nature of the MC interior forces the water-soluble reactants to concentrate inside the capsules which act as microreactors. Based on the example of catalytically driven reduction of 4-nitrophenol we demonstrate that encapsulated Ag/SiO2 particles possess enhanced catalytic activity as compared to the catalyst being freely dispersed in reaction medium.

Polymer microcapsules loaded with Ag nanocatalyst as active microreactors