Abstract
Stable aqueous dispersion of silver ion-exchanged nanozeolite Y was reacted with the three common dihydroxyphenols, hydroquinone, catechol, and resorcinol. With hydroquinone and catechol, there was rapid reduction of the intrazeolitic silver to form metallic silver with complete destruction of the zeolite framework. Resorcinol, the weakest reducing agent among the group, behaved differently. The formation of metallic silver was considerably slower, and the zeolite framework was mostly intact. This made it possible to examine the evolution of silver cluster formation with optical spectroscopy and transmission electron microscopy. In the first 135 min of reaction, extinction/fluorescence spectroscopy indicates the formation of Agn 4 clusters. The smaller clusters disappear more rapidly with time. For the 1 h reduced sample, transmission electron microscopy showed uniform distribution of 1.4 nm Ag particles throughout the zeolite. After 2 h of reduction, the average size of the particles was 2.5 nm...
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