Synergistic effect and mechanism of FeO  and CeO  co-doping on the superior catalytic performance and SO2 tolerance of Mn-Fe-Ce/ACN catalyst in low-temperature NH3-SCR of NO

Jiang, Lijun; Liang, Ya; Liu, Weizao; Wang, Hongli; Aldahri, Tahani; Carrero, Dennise Sosa; Liu, Qingcai

doi:10.1016/j.jece.2021.106360

Cited by 59 publications

(22 citation statements)

References 65 publications

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“… , , For the CeCrFe/TiO 2 catalyst, the reduction peaks appearing at 570 °C belong to the reduction of Cr 6+ → Cr 3+ and Fe 2 O 3 → Fe 3 O 4 . The reduction peak at 630 °C belongs to the reduction of FeO→Fe 0 and the transformations of surface CeO 2 /Ce 2 O 3 . The H 2 reduction peaks at 695 °C may be due to overlapping of transformations of surface CeO 2 /Ce 2 O 3 and Cr 3+ →Cr 0.…”

Section: Resultsmentioning

confidence: 97%

“…64 The reduction peak at 630 °C belongs to the reduction of FeO→Fe 0 and the transformations of surface CeO 2 /Ce 2 O 3 . 65 The H 2 reduction peaks at 695 °C may be due to overlapping of transformations of surface CeO 2 /Ce 2 O 3 and Cr 3+ →Cr 0.66 The reduction peaks at 763 °C were attributed to lattice oxygen contained in bulk CeO 2 . 62 As for CeCrLa/TiO 2 , the reduction peak can be divided into four peaks.…”

Section: H 2 -Tpr Analysismentioning

confidence: 99%

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Low-Dose Element-Doped CeCrM/TiO₂ (M = La, Cu, Fe, LaCu, LaFe) Catalyst for Low-Temperature NH₃-SCR Process: Synergistic Effect of LaCu/LaFe

Liu

et al. 2022

ACS Omega

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A series of CeCrM/TiO2 (M = La, Cu, Fe, LaCu, LaFe) catalysts were prepared via impregnation method and are employed as low-temperature NH3-SCR catalysts. The present study investigates the low-dose element doping on the TiO2-supported catalyst to improve the NH3-SCR performance. And CeCrLaCu/TiO2 exhibited the best catalytic performance (NO conversion approaching 100% at 260–420 °C). The characterization results show that the synergistic effect of LaCu and LaFe on the catalytic performance was more obvious than that of Cu, Fe, and La alone. The doping of LaCu/LaFe decreased the specific surface area of the catalyst but increased the dispersion, surface acidity, and reducibility of the catalyst. Moreover, LaCu/LaFe promoted the formation of valence state distribution and oxygen vacancy content on the surface of the catalyst. There were more Ce3+, Cr6+, Cu+, and oxygen adsorbed on the surface of the CeCrLaCu/TiO2 catalyst. H2-TPR analysis showed that the synergistic effect of LaCu was more likely to promote the reduction of Cr and Cu and increase the reduction degree of metal oxides. However, Fe is easier to coordinate with La, thus improving the redox performance of the catalyst. Compared with CeCrLaFe/TiO2, the ammonia adsorption capacity of CeCrLaCu/TiO2 is better. Therefore, the synergistic effect of LaCu can promote the reaction performance of NH3-SCR better.

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Section: Resultsmentioning

confidence: 97%

Section: H 2 -Tpr Analysismentioning

confidence: 99%

Low-Dose Element-Doped CeCrM/TiO₂ (M = La, Cu, Fe, LaCu, LaFe) Catalyst for Low-Temperature NH₃-SCR Process: Synergistic Effect of LaCu/LaFe

Liu

et al. 2022

ACS Omega

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“…The XPS result of Ce 3d is composed of two partial peaks that belong to the spin-orbit split of the 3d 5/2 and 3d 3/2 core holes. Ce 3+ consists of two peaks at 885.4 eV and 903.4 eV which corresponds to Ce 3+ 3d 5/2 and Ce 3+ 3d 3/2 [40]. The peaks at 882.7 eV, 889.4 eV and 898.0 eV are characteristics to Ce 4+ 3d 5/2 , and the peaks at 901.3 eV, 907.3 eV, 916.4 eV are assigned to Ce 4+ 3d 3/2 .…”

Section: Surface Elements and Valence Statesmentioning

confidence: 99%

Thulium oxides supported on MnCeTiO_X catalysts for low-temperature NH₃-SCR of NO_X

Huang

Chen

et al. 2022

Mater. Res. Express

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In this work, the MnCeTiOX catalyst was prepared by sol-gel method and doped with thulium (Tm), which improved its low-temperature selective catalytic reduction (SCR) activity and resistance to SO2 poisoning. In this paper, the surface properties of Tm-doped MnCeTiOX catalysts were studied and analysed by means of BET, XRD, SEM, NH3-TPD, H2-TPR and XPS. The catalyst performance was tested by using simulated flue gas. The results show that Tm doping can effectively inhibit the crystallization degree of TiO2, increase the catalyst specific surface area, and make the elements distribute more uniformly on the catalyst surface. Meanwhile, the amount of Brønsted acid sites could be increased by Tm doping. It also increased the concentration of surface adsorbed oxygen and the ratio of Mn4+/Mn and Ce3+/Ce. Therefore, the activity of the catalyst was improved by Tm doping in the temperature range of 90 °C to 270 °C, the catalyst activity remained above 97% in the temperature range of 180 °C to 270 °C. And the catalyst activity remained above 88% after a 10 h-SO2 poisoning test. Tm doping could effectively inhibit SO2 poisoning of the catalyst and reduce the adsorption of SO2 on the catalyst surface.

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“…combustion. 2 The NO x in the atmosphere can not only cause photochemical smog and nitric acid rain to destroy the ecological balance, 3,4 but can also induce permanent damage to the human central nervous system when the concentration of NO x in the atmosphere is on the high side. 5 Therefore, controlling the emission of NO x is of great significance for protecting the environment and human health.…”

Section: Bo Qinmentioning

confidence: 99%

Recent progress of low-temperature selective catalytic reduction of NO_x with NH₃ over manganese oxide-based catalysts

Qin

Wei

Yin

et al. 2022

Phys. Chem. Chem. Phys.

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Synergistic effect and mechanism of FeO and CeO co-doping on the superior catalytic performance and SO2 tolerance of Mn-Fe-Ce/ACN catalyst in low-temperature NH3-SCR of NO

Cited by 59 publications

References 65 publications

Low-Dose Element-Doped CeCrM/TiO₂ (M = La, Cu, Fe, LaCu, LaFe) Catalyst for Low-Temperature NH₃-SCR Process: Synergistic Effect of LaCu/LaFe

Low-Dose Element-Doped CeCrM/TiO₂ (M = La, Cu, Fe, LaCu, LaFe) Catalyst for Low-Temperature NH₃-SCR Process: Synergistic Effect of LaCu/LaFe

Thulium oxides supported on MnCeTiO_X catalysts for low-temperature NH₃-SCR of NO_X

Recent progress of low-temperature selective catalytic reduction of NO_x with NH₃ over manganese oxide-based catalysts

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Synergistic effect and mechanism of FeO and CeO co-doping on the superior catalytic performance and SO2 tolerance of Mn-Fe-Ce/ACN catalyst in low-temperature NH3-SCR of NO

Cited by 59 publications

References 65 publications

Low-Dose Element-Doped CeCrM/TiO2 (M = La, Cu, Fe, LaCu, LaFe) Catalyst for Low-Temperature NH3-SCR Process: Synergistic Effect of LaCu/LaFe

Low-Dose Element-Doped CeCrM/TiO2 (M = La, Cu, Fe, LaCu, LaFe) Catalyst for Low-Temperature NH3-SCR Process: Synergistic Effect of LaCu/LaFe

Thulium oxides supported on MnCeTiOX catalysts for low-temperature NH3-SCR of NOX

Recent progress of low-temperature selective catalytic reduction of NOx with NH3 over manganese oxide-based catalysts

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Low-Dose Element-Doped CeCrM/TiO₂ (M = La, Cu, Fe, LaCu, LaFe) Catalyst for Low-Temperature NH₃-SCR Process: Synergistic Effect of LaCu/LaFe

Low-Dose Element-Doped CeCrM/TiO₂ (M = La, Cu, Fe, LaCu, LaFe) Catalyst for Low-Temperature NH₃-SCR Process: Synergistic Effect of LaCu/LaFe

Thulium oxides supported on MnCeTiO_X catalysts for low-temperature NH₃-SCR of NO_X

Recent progress of low-temperature selective catalytic reduction of NO_x with NH₃ over manganese oxide-based catalysts