首页|Deactivation induced by metal sulfate over MnCeOx catalyst in NH3-SCR reaction at low temperature

Deactivation induced by metal sulfate over MnCeOx catalyst in NH3-SCR reaction at low temperature

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Sulfate adsorption is one of the factors that cause the poisoning of catalyst in the low-temperature NH3 selective catalytic reduction reaction(NH3-SCR).In this paper,by controlling the co-adsorption time of SO2 and O2 at 150 ℃,a range of sulfated MnCeOx catalysts with different contents of metal sulfate species were prepared to reveal the influence of metal sulfate species content on the catalytic performances and reaction mechanisms at low temperature.The catalytic activity below 250 ℃ rapidly decreases with increasing metal sulfate species content.The results of characterizations shed light on the reduction of specific surface area,Mn4+and Ce3+content,and redox ability of MnCeOx owing to the formation of metal sulfate species.Further experiments reveal that metal sulfate species preferentially absorb on MnOx domains rather than on CeO2 domains,and the adsorbed metal sulfate species can suppress the Eley-Rideal and the Langmuir-Hinshelwood reaction mechanisms over the sulfated MnCeOx.All the above results are detrimental to the activity of sulfated MnCeOx in the low-temperature NH3-SCR reaction.

NH3 selective catalytic reductionMnCeOx catalystSulfationLow-temperature activitySO2 poisoningRare earths

Qiao Xie、Dongqi An、Linsen Zhou、Tingzhen Li、Zhenghua Hu、Menghan Chen、Menglan Ma、Lei Zhang、Jingfang Sun、Lin Dong

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School of Environmental and Chemical Engineering,Chongqing Three Gorges University,Chongqing,404000,China

Key Laboratory of Water Environment Evolution and Pollution Control in the Three Gorges Reservoir,Chongqing Three Gorges University,Chongqing,404000,China

Jiangsu Key Laboratory of Vehicle Emissions Control,Center of Modern Analysis,School of Environment,Nanjing University,Nanjing,210093,China

Institute of Materials,China Academy of Engineering Physics,Mianyang,621908,China

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国家自然科学基金Scientific And Technological Research Program Of Chongqing Municipal Education CommissionScientific And Technological Research Program Of Chongqing Municipal Education CommissionScience and Technology Project of WanzhouOpen Project Program of Key Laboratory of Water Environment Evolution and Pollution Control in the Three Gorges ReservoirProject Program of Chongqing Postgraduate Research and Innovation

21607019KJQN202101242KJQN202001227wzstc-2019034WEPKL2019ZD-04CYS21489

2024

10.1016/j.jre.2023.07.004

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(6)
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