Abstract
Hydrothermal deactivation over CuFe/BEA and CuFe/BEA-HT for the selective catalytic reduction of NO with NH3 (NH3-SCR) were investigated with different characterizations. The hydrothermal treatment destroys BEA skeleton, losing acid sites reacting with the aerial NOx. H2-TPR and XPS reveal that the hydrothermal treatment could weaken the interaction between Cu/Fe species and the surrounding other atoms, causing the aggregation of isolated and low nuclearity copper/iron species. Aggregated copper/iron oxides depress the redox property of CuFe/BEA-HT, producing the lower concentration of NO2. Besides, results of in situ DRIFTS also indicate that both CuFe/BEA and CuFe/BEA-HT follow Eley–Rideal (E–R) mechanism at 225°C.
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