The Formation of Metallic Silver in Silver-Form Zeolites

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The formation of silver crystallites in silver-form zeolites was investigated, mainly by means of X-ray diffraction analysis. Silver ions were reduced to the zero-valent state; they aggregated to metals in three cases in this study—first, when silver-form zeolites were heated in a helium flow at above 600°C; secondly, when they were reduced by hydrogen, and lastly, when they were treated with the alkyl benzenes or alcohols above 300°C. The silver crystallites had sizes of 150–400, 150–200, and 200–300Å respectively when Ag(31.6%)–Na–Y<SUB>4.6</SUB> was rereduced in the three cases mentioned above. If the silver ions are reduced, the zeolite becomes decationated-form, in which metallic silver is dispersed. The silver metals formed in the zeolite have peculiar interactions with oxygen.
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