Enhancement of Low-Temperature NH3-SCR Catalytic Activity and H2O Resistance Ability Over MnOx/TiO2 Catalyst by Expanded Graphite

Chitsazi, Hossein; Wu, Rui; Zhang, Ningqiang; He, Junda; Zhang, Guizhen; He, Hong

doi:10.1007/s10562-020-03170-7

Cited by 21 publications

(9 citation statements)

References 31 publications

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“…This was because the H 2 O was adsorbed at the active sites of the catalyst instead of NH 3 . After the H 2 O was cut off, the active sites recovered and the catalyst activity was restored, 32,33 which was confirmed in XPS. The SO 2 resistance test of MnFe@Ti is shown in Figure S3.…”

Section: Resultsmentioning

confidence: 66%

MnFeO_x@TiO₂ Nanocages for Selective Catalytic Reduction of NO with NH₃ at Low Temperature

Cai

Zhang

Tang

et al. 2021

ACS Appl. Nano Mater.

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Based on Prussian blue analogues (PBAs), using the in situ self-assembly method, MnFeO x @TiO 2 double-walled nanocages with a hollow and porous structure were constructed by annealing the core−shell structure of Mn 3 [Fe(CN) 6 ] 2 •nH 2 O@ Ti(OH) 4 . Compared with the MnFeO x single-walled nanocages without the TiO 2 shell, the MnFeO x @TiO 2 double-walled nanocages exhibited a better catalytic performance in selective catalytic reduction (SCR) with NH 3 at low temperatures, and the NO removal efficiency could reach 80% at 145−260 °C. Establishing the TiO 2 shell layer could effectively improve the adsorption and activation performance of the reactants. Through a series of characterizations, it was confirmed that the MnFeO x @TiO 2 double-walled nanocages possessed a large specific surface area, abundant structural defects, and oxygen vacancies. Besides, the MnFeO x @TiO 2 catalyst had more Mn 4+ species, higher Fe 3+ species, more surface-adsorbed oxygen (O ads ) species, and a strong interaction between MnO x , FeO x , and the TiO 2 shell, which led to better catalytic activity. At the same time, the MnFeO x @TiO 2 double-walled nanocages exhibited satisfactory thermal stability and better H 2 O resistance.

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Section: Resultsmentioning

confidence: 66%

MnFeO_x@TiO₂ Nanocages for Selective Catalytic Reduction of NO with NH₃ at Low Temperature

Cai

Zhang

Tang

et al. 2021

ACS Appl. Nano Mater.

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“…From Figure , three peaks appear from 100 to 500 °C in the NH 3 -TPD profile of each catalyst. The peaks at the range of 150–250, 250–400, and 400–550 °C refer to weak acid, medium-strength acid, and high-strength acid, respectively. , According to the literature, the medium-strength and high-strength acid sites are effective for NO reduction at moderate to high temperature. The NH 3 uptake of these catalysts in descending order is CeCrLaCu/TiO 2 > CeCrLaFe/TiO 2 > CeCrLa/TiO 2 > CeCrFe/TiO 2 > CeCrCu/TiO 2 .…”

Section: Resultsmentioning

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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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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“…The peaks at the range of 150-200 C, 250-370 C and 400-500 C refer to weak acid, mediumstrength acid, and high-strength acid, respectively. [57][58][59] According to literature, 60 the medium-strength and high-strength acid sites are effective for NO reduction at moderate to high temperature. As seen from Fig.…”

Section: Nh 3 -Tpd Analysismentioning

confidence: 99%

Improvement of low-temperature NH₃-SCR catalytic performance over nitrogen-doped MO_x–Cr₂O₃–La₂O₃/TiO₂–N (M = Cu, Fe, Ce) catalysts

Sun

Liu

et al. 2021

RSC Adv.

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Enhancement of Low-Temperature NH3-SCR Catalytic Activity and H2O Resistance Ability Over MnOx/TiO2 Catalyst by Expanded Graphite

Cited by 21 publications

References 31 publications

MnFeO_x@TiO₂ Nanocages for Selective Catalytic Reduction of NO with NH₃ at Low Temperature

MnFeO_x@TiO₂ Nanocages for Selective Catalytic Reduction of NO with NH₃ at Low Temperature

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

Improvement of low-temperature NH₃-SCR catalytic performance over nitrogen-doped MO_x–Cr₂O₃–La₂O₃/TiO₂–N (M = Cu, Fe, Ce) catalysts

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Enhancement of Low-Temperature NH3-SCR Catalytic Activity and H2O Resistance Ability Over MnOx/TiO2 Catalyst by Expanded Graphite

Cited by 21 publications

References 31 publications

MnFeOx@TiO2 Nanocages for Selective Catalytic Reduction of NO with NH3 at Low Temperature

MnFeOx@TiO2 Nanocages for Selective Catalytic Reduction of NO with NH3 at Low Temperature

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

Improvement of low-temperature NH3-SCR catalytic performance over nitrogen-doped MOx–Cr2O3–La2O3/TiO2–N (M = Cu, Fe, Ce) catalysts

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MnFeO_x@TiO₂ Nanocages for Selective Catalytic Reduction of NO with NH₃ at Low Temperature

MnFeO_x@TiO₂ Nanocages for Selective Catalytic Reduction of NO with NH₃ at Low Temperature

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

Improvement of low-temperature NH₃-SCR catalytic performance over nitrogen-doped MO_x–Cr₂O₃–La₂O₃/TiO₂–N (M = Cu, Fe, Ce) catalysts