首页|Distinct effect of preparation methods on reaction efficiency of Mn-Ce/Al2O3 catalysts in low-temperature NH3-SCR

Distinct effect of preparation methods on reaction efficiency of Mn-Ce/Al2O3 catalysts in low-temperature NH3-SCR

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In this study,a series of Mn-Ce/Al2O3 catalysts was prepared by different methods of deposition-precipitation(MnCeAl-DP),impregnation(MnCeAl-IM)and citric acid(MnCeAl-CA),and the distinct effect of preparation methods on NOx removal performance at low temperature was explored.Results show that MnCeAl-DP exhibits not only the best activity but also the highest resistance against SO2/H2O.With the assistance of comprehensive characterizations from scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET),X-ray diffraction(XRD),H2-temperature programmed reduction(H2-TPR),NH3-temperature programmed desorption(NH3-TPD),and X-ray photoelectron spectroscopy(XPS),it is revealed that the MnCeAl-DP sample owns admired features of large surface area and pore volume,enriched Mn4+and chemisorbed oxygen species originating from enhanced interaction between MnOx and CeO2,as well as improved adsorption capacity to NH3 and NO.All these factors contribute to activity enhancement.Further in-situ DRIFTS studies reveal that the improvement of NH3-SCR performance over MnCeAl-DP is related to the formation of abundant nitrate species,which is beneficial to the"NH4NO3"reaction pathway and thus enhances low-temperature activity.

Mn-Ce/Al2O3 catalystsNH3-SCRLow temperatureNH4NO3Fast SCRRare earths

Shijie Hao、Yandi Cai、Wei Wei、Yanan Lv、Jiawei Ji、Wei Tan、Jingfang Sun、Liwei Jia、Changjin Tang、Lin Dong

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State Key Laboratory of Pollution Control and Resource Reuse,School of Environment,Jiangsu Key Laboratory of Vehicle Emissions Control,Center of Modern Analysis,Key Laboratory of Mesoscopic Chemistry of MOE,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing,210023,China

Wuxi Weifu Environmental Catalysts Co.,Ltd.,Wuxi,214028,China

School of Environment,Nanjing Normal University,Nanjing 210023,China

2024

10.1016/j.jre.2023.08.021

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(10)