Abstract
70% Ammonium-exchanged zeolite NH 4, Na-Y is completely deammoniated by low-temperature plasma calcination, while the crystallinity of the samples is not impaired. Neither the plasma calcined nor shallow bed treated material is “pure H-Y” zeolite, and 27Al MAS NMR indicates a slight dealumination of the zeolitic framework in each case. Hydronium ion exchange to product H,Na-Y from Na-Y using highly dilute acidic medium also resulted in partial dealumination of the sample. Plasma calcination of 87% ammonium-exchanged NH 4, Na-Y caused a severe loss of crystallinity, possibly because of mineral acid formation at inaccessible sites. Low-temperature plasma calcination is a mild technique for the oxidative removal of ammonia as long as oxidation products can easily leave the crystallite.
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