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Colloidal silver catalysts protected by poly(N-vinyl-2-pyrrolidone) (PVP) were prepared by an ethanol reduction method of silver perchlorate in the presence of PVP. Transmission electron micrograph of the obtained colloids revealed fine particles (av. diameter 3.1 nm) with uniform size and narrow size distribution. Oxidation of ethylene catalyzed by PVP-protected silver colloids was performed in ethanol/water...
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