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Article Abstract
A dual-element modification strategy was proposed to promote the catalytic performance of the α-FeO catalyst for the selective catalytic reduction of NO by NH (NH-SCR of NO) at both low and high temperatures. By optimizing the loading amount of CuO (4 wt %) and WO (5 wt %), a wide operating temperature window (150-350 °C) was achieved on the modified α-FeO catalyst (W/Cu/Fe). Further characterizations revealed that the enhanced low-temperature activity could be attributed to the improved redox performance of α-FeO through CuO modification, while the superior high-temperature activity was primarily ascribed to the enhanced surface acidity induced by WO modification. The synergistic effect of CuO and WO modifications facilitated the NH-SCR reaction on the modified α-FeO catalysts to efficiently proceed through the Eley-Rideal (E-R) mechanism pathway. This provided compelling evidence that the catalytic performance of NH-SCR catalysts at different temperatures was dominantly governed by distinct factors (e.g., redox property and surface acidity), offering valuable insights for the rational design of robust catalysts for NO abatement.
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