Construction of fluffy MnFe nanoparticles and their synergistic catalysis for selective catalytic reduction reaction at low temperature

Zhao, Fanfan; Zhang, Guodong; Tang, Zhicheng; Zha, Fei

doi:10.1016/j.fuel.2022.124185

Cited by 18 publications

(4 citation statements)

References 65 publications

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“…According to earlier literature, Mn 4+ were likely to be one of the causes for the increased redox capacity. 26 We observed that the amount of Mn 4+ in Ho-TNTs@Mn and Ho-TNTs/Mn was lower than that in TNTs@Mn, probably because Ho interacts with Mn 4+ to convert it to Mn 3+ . 17 In the three fresh catalysts, Ho-TNTs/Mn had the lowest Mn 4+ ratio (19.2%), indicating that it possessed weak redox ability.…”

Section: Surface Chemical Composition Of the Catalystmentioning

confidence: 64%

Unveiling a remarkable enhancement role by designing a confined structure Ho-TNTs@Mn catalyst for low-temperature NH₃-SCR reaction

et al. 2023

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Section: Surface Chemical Composition Of the Catalystmentioning

confidence: 64%

Unveiling a remarkable enhancement role by designing a confined structure Ho-TNTs@Mn catalyst for low-temperature NH₃-SCR reaction

et al. 2023

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“…NH 3 –SCR activity: De-NO x performance of the Mn–Fe–BTC (a); N 2 selectivity and NH 3 conversion of 2Mn-1Fe-BTC (b); tolerance of 100 ppm of SO 2 and 6% H 2 O on the 2Mn-1Fe-BTC (c); comparison of the de-NO x performance over Mn–Fe based catalysts reported in the literature (temperature range with NO conversion greater than 90%) (d). − …”

Section: Resultsmentioning

confidence: 99%

Rational Regulation of Reducibility and Acid Site on Mn–Fe–BTC to Achieve High Low-Temperature Catalytic Denitration Performance

Song

Guo

et al. 2023

ACS Appl. Mater. Interfaces

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Selective catalytic reduction with ammonia is the mainstream technology of flue gas denitration (de-NO x ). The reducibility and acid site are two important factors affecting the de-NO x performance, and effective regulation between them is the key to obtain a highly efficient de-NO x catalyst. Herein, a series of Mn−Fe−BTC with different ratios of Mn and Fe are synthesized, among which 2Mn-1Fe-BTC with 2:1 molar ratio of Mn and Fe has excellent low-temperature (LT) de-NO x performance (above 90% NO conversion between 60 and 270 °C) and good tolerance to H 2 O and SO 2 poisoning (88% NO conversion at 150 °C with 100 ppm of SO 2 and/or 6% H 2 O). It is revealed that the reducibility properties and acid sites of Mn−Fe− BTC can be flexibly tuned by the ratio of Mn and Fe. The difference in electronegativity between Fe and Mn leads to the redistribution of valence electrons, which enables the controllable reducibility of Mn−Fe−BTC. Furthermore, different amounts of Mn and Fe lead to different electron transport, which determines the type and number of acid sites. The synergistic effect of Mn and Fe endows Mn−Fe−BTC with enhanced surface molecular adsorption capacity and enables the catalyst to selectively chemisorb NH 3 and NO at different active sites. This research provides guidance for the flexible regulation of reducibility and acid site of LT de-NO x catalyst.

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“…Meanwhile, bridged nitrite (1550 cm −1 ), bidentate nitrate (1280 cm −1 ), trans-(N 2 O 2 ) 2− (1078 cm −1 ), and cis-(N 2 O 2 ) 2− (1025 cm −1 ) began to accumulate. 73,74 According to the experimental analysis of the above two parts, NO and NH 3 were adsorbed on the catalyst surface, and the whole NH 3 -SCR reaction mainly followed the L-H mechanism.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Boosting Water-Resistance Ability on a PTFE Modified Ti-OMS-2 Catalyst for Low-Temperature NH₃-SCR Reaction

Zhao

Zhang

Huang

et al. 2023

Ind. Eng. Chem. Res.

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Manganese-based catalysts are considered as ideal alternative catalysts for NH3 selective catalytic reduction of NO x due to their excellent denitrification performance, but their weak water resistance limits industrial applications. To improve the water resistance of low-temperature Mn-based catalysts in the NH3-SCR reaction, a Ti-OMS-2 (titanium-manganese oxide octahedral molecular sieve) catalyst was prepared by the hydrothermal method, and polytetrafluoroethylene (PTFE) powder was methodically introduced on the catalyst surface by the impregnation method. Importantly, the introduction of PTFE on the Ti-OMS-2 catalyst surface could effectively inhibit the adsorption of water molecules and reduce the probability of active species being consumed. Thus, it showed better catalytic activity and water resistance. The activity of the Ti-OMS-2-20%-PTFE catalyst could reach more than 80% when water vapor was introduced at 180 °C. More importantly, the Ti-OMS-2-20%-PTFE catalyst did not readily bind the active species (Mn4+ and Oads) and maintained the adsorption and activation of NH3 species. Moreover, it was easy for PTFE to form a weak surface hydrophobic layer on the Ti-OMS-2 catalyst surface that could effectively inhibit water toxicity. Therefore, this work provided a reasonable idea and experimental accumulation for the industrial application of Mn-based catalysts.

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Construction of fluffy MnFe nanoparticles and their synergistic catalysis for selective catalytic reduction reaction at low temperature

Cited by 18 publications

References 65 publications

Unveiling a remarkable enhancement role by designing a confined structure Ho-TNTs@Mn catalyst for low-temperature NH₃-SCR reaction

Unveiling a remarkable enhancement role by designing a confined structure Ho-TNTs@Mn catalyst for low-temperature NH₃-SCR reaction

Rational Regulation of Reducibility and Acid Site on Mn–Fe–BTC to Achieve High Low-Temperature Catalytic Denitration Performance

Boosting Water-Resistance Ability on a PTFE Modified Ti-OMS-2 Catalyst for Low-Temperature NH₃-SCR Reaction

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Construction of fluffy MnFe nanoparticles and their synergistic catalysis for selective catalytic reduction reaction at low temperature

Cited by 18 publications

References 65 publications

Unveiling a remarkable enhancement role by designing a confined structure Ho-TNTs@Mn catalyst for low-temperature NH3-SCR reaction

Unveiling a remarkable enhancement role by designing a confined structure Ho-TNTs@Mn catalyst for low-temperature NH3-SCR reaction

Rational Regulation of Reducibility and Acid Site on Mn–Fe–BTC to Achieve High Low-Temperature Catalytic Denitration Performance

Boosting Water-Resistance Ability on a PTFE Modified Ti-OMS-2 Catalyst for Low-Temperature NH3-SCR Reaction

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Unveiling a remarkable enhancement role by designing a confined structure Ho-TNTs@Mn catalyst for low-temperature NH₃-SCR reaction

Unveiling a remarkable enhancement role by designing a confined structure Ho-TNTs@Mn catalyst for low-temperature NH₃-SCR reaction

Boosting Water-Resistance Ability on a PTFE Modified Ti-OMS-2 Catalyst for Low-Temperature NH₃-SCR Reaction