| Novel Mn-Ce bi-oxides loaded on 3D monolithic nickel foam for low-temperature NH3-SCR de-NOx:Preparation optimization and reaction mechanism |
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| 作者姓名： | Shuquan Ni Xiaolong Tang Honghong Yi Fengyu Gao Chengzhi Wang Yiran Shi Runcao Zhang Wenjuan Zhu |
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| 作者单位： | School of Energy and Environmental Engineering;Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants |
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| 基金项目： | Project supported by the National Key R&D Program of China(2017YFC0210303);National Natural Science Foundation of China(21806009);China Postdoctoral Science Foundation(2019T120049);Fundamental Research Funds for the Central Universities(06500152,FRF-TP-18-019A1)。 |
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| 摘 要： | This study explored the superior citrate method(CM)to synthesize Mn-Ce bi-oxides on 3 D monolithic Ni-foam(NF)catalysts for the selective catalytic reduction of NO by NH3(NH3-SCR).The 17 wt%Mn(7)Ce(3)Ox/NF(CM-17)catalyst shows the NOxconversion of 98.7%at 175℃and 90%in the presence of 10 vol%H2 O.It is revealed that the combination of surface-active oxygen(formed by high-level oxygen vacancies)and strongly oxidized Mn4+species promots the Fast-SCR reactions,in which Mn4+species play a leading role in NH3-SCR reaction,and the unsaturated Ni atoms and also Ce3+species promote electron exchange and thus improve the redox performance.The coexistence mechanisms of Fast-SCR reactions and E-R pathways are observed over Mn-CeOx/NF catalyst,which may be promoted by the Br?nsted sites at low temperature.In addition,the heat resistance,stability,3 D monolithic porous structure and excellent physical properties of foam nickel provide a unique growth substrates for catalysts preparation and reaction sites for NOxpurification.Therefore,industrial application of Mn-Ce bioxides loaded on 3 D monolithic is proposed to be achieved through reasonable preparation methods.
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| 关 键 词： | NH3-SCR Low temperature Citrate method Fast-SCR 3D monolithic catalysts Oxygen vacancies |
| 收稿时间： | 22 August 2020 |
Novel Mn–Ce bi-oxides loaded on 3D monolithic nickel foam for low-temperature NH3-SCR de-NOx: Preparation optimization and reaction mechanism |
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| Shuquan Ni,Xiaolong Tang,Honghong Yi,Fengyu Gao,Chengzhi Wang,Yiran Shi,Runcao Zhang,Wenjuan Zhu.Novel Mn-Ce bi-oxides loaded on 3D monolithic nickel foam for low-temperature NH3-SCR de-NOx:Preparation optimization and reaction mechanism[J].Journal of Rare Earths,2022,40(2):268-278. |
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| Affiliation: | 1. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China |
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| Abstract: | This study explored the superior citrate method (CM) to synthesize Mn–Ce bi-oxides on 3D monolithic Ni-foam (NF) catalysts for the selective catalytic reduction of NO by NH3 (NH3-SCR). The 17 wt% Mn(7)Ce(3)Ox/NF (CM-17) catalyst shows the NOx conversion of 98.7% at 175 °C and 90% in the presence of 10 vol% H2O. It is revealed that the combination of surface-active oxygen (formed by high-level oxygen vacancies) and strongly oxidized Mn4+ species promots the Fast-SCR reactions, in which Mn4+ species play a leading role in NH3-SCR reaction, and the unsaturated Ni atoms and also Ce3+ species promote electron exchange and thus improve the redox performance. The coexistence mechanisms of Fast-SCR reactions and E-R pathways are observed over Mn-CeOx/NF catalyst, which may be promoted by the Brønsted sites at low temperature. In addition, the heat resistance, stability, 3D monolithic porous structure and excellent physical properties of foam nickel provide a unique growth substrates for catalysts preparation and reaction sites for NOx purification. Therefore, industrial application of Mn–Ce bi-oxides loaded on 3D monolithic is proposed to be achieved through reasonable preparation methods. |
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| Keywords: | Low temperature Citrate method Fast-SCR 3D monolithic catalysts Oxygen vacancies |
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