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Azo Dyes Encapsulated within Aluminosilicate Microporous Materials

A Novel synthetic method is presented for the encapsulation of azo dyes within a range of zeolites by in situ diazotisation and coupling reactions. The pH changes of methyl red, methyl orange and dimethyl yellow indicator dyes encapsulated in zeolites HY, NaY, ZSM5, mordenite and unltrastable Y were investigated by visual inspection and UV-visible spectroscopy

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