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Unraveling Excellent Performance in NH3-SCR over Cr-Doped NiMn-LDO Catalysts: A Combined Experimental and
Xinru Luan1, Yujia Zhai1, Yingying Guo1
1School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China.
Abstract:
A sequence of Cr-doped NiMnO layered double oxide catalysts was synthesized through coprecipitation and applied in selective catalytic reduction of NO with ammonia (NH3-SCR). The catalytic performance for NO reduction was enhanced by tuning the Ni/Mn/Cr molar ratios of the Ni1Mn1Cr-LDO precursors (x = 1, 2, 3); notably, Ni1Mn1Cr2-LDO achieved over 90% NO conversion and N2 selectivity within the temperature range of 150-300 °C. Moreover, Ni1Mn1Cr2-LDO demonstrated significant resistance to SO2 and H2O along with exceptional stability. From the results of the characterization of the physicochemical properties of the catalysts, the presence of Cr species in Ni1Mn1Cr-LDO may enhance the surface acidity and reducibility. Additionally, higher amounts of Mn4+, Ni3+, Cr3+, and surface-adsorbed oxygen species were detected on the Ni1Mn1Cr2-LDO catalyst. Through in situ DRIFTS experiments, the promotion of the NH3-SCR process on Ni1Mn1Cr2-LDO was confirmed to involve a combination of Langmuir-Hinshelwood and Eley-Rideal mechanisms.
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