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Cu-loaded dealuminated Y zeolites active in selective catalytic reduction of nitric oxide with ammonia

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The selective catalytic reduction of NO with ammonia in the presence of oxygen has been carried out on Cu-loaded dealuminated Y zeolite catalysts. Copper was introduced by the usual ion-exchange procedure with an aqueous solution of cupric acetate. On deeply dealuminated USY zeolites, Cu2+ was supported in the amount larger than 2Cu/Al = 2, resulting in the formation of CuO fine particles in addition to the isolated and dimer Cu2+ species. The specific catalytic activity per surface copper on the CuO particles was very high compared with these Cu2+ species. NO adsorption measurement revealed the higher dispersion of CuO on the deeply dealuminated USY than on SiO2, which made Cu/USY a better catalyst for the reduction of NO. The reaction intermediates were investigated through the IR spectra of adsorbed species.


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