Indium modified MnOx for high-efficient NH3-SCR De-NOx: Promotional role of indium and its catalytic performance

Li, Haixia; Yang, Changze; Zhang, Shuaibo; Zhang, Anchao; Sun, Zhijun; Zhang, Xinmin; Jin, Leying; Song, Zhiheng

doi:10.1016/j.jece.2022.107462

Cited by 8 publications

(8 citation statements)

References 63 publications

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“…The Mg 3 Fe 1 ‐LDO and Mg 3 Fe 1 ‐LDO/10CNTs catalysts were pre‐treated with 500 ppm NH 3 /N 2 at 210 °C for 30 min, and then NO+O 2 was introduced, the DRIFT spectra were recorded, as depicted in Figure 11(a) and Figure 11(b). From Figure 11(b), it is distinct that the surface of Mg 3 Fe 1 ‐LDO/10CNTs catalyst was covered by fresh NH 3 species after the exposure to NH 3 flow, as revealed by the bands at 1618, 1538, 1460, 963 and 925 cm −1 [51–55] . With the injection of NO+O 2 , the bands of adsorbed NH 3 species weakens with the increase of time, meanwhile, the signals of adsorbed NO x species at 1628, 1594 and 1227 cm −1 can be obviously observed [56–58] .…”

Section: Resultsmentioning

confidence: 93%

“…From Figure 11(b), it is distinct that the surface of Mg 3 Fe 1 -LDO/10CNTs catalyst was covered by fresh NH 3 species after the exposure to NH 3 flow, as revealed by the bands at 1618, 1538, 1460, 963 and 925 cm À 1 . [51][52][53][54][55] With the injection of NO + O 2 , the bands of adsorbed NH 3 species weakens with the increase of time, meanwhile, the signals of adsorbed NO x species at 1628, 1594 and 1227 cm À 1 can be obviously observed. [56][57][58] These results indicate that adding Cu can effectively promote the adsorption of NH 3, and all the adsorbed NH 3 species are active in the NH 3 -SCR reaction over Mg 3 Fe 1 -LDO/10CNTs catalyst.…”

Section: Chemistryselectmentioning

confidence: 99%

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Low‐Temperature NH₃ Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

Liu

et al. 2023

ChemistrySelect

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In this study, a series of Mg3Fe1‐layered double oxide/xcarbon nanotubes (Mg3Fe1‐LDO/xCNTs) catalysts were constructed from the topological shift of Mg3Fe1‐layered double hydroxide (Mg3Fe1‐LDH) precursor. The as‐prepared catalysts were innovatively evaluated as potential candidates for low temperature selective catalytic reduction of NO with NH3 (NH3‐SCR). It was found that Mg3Fe1/10CNTs catalyst exhibited superb NH3‐SCR activity, with NOx conversion exceeding 80 % at low temperatures (180–270 °C). Moreover, excellent durability and stability towards SO2 was obtained. Such high catalytic efficiency can be attributed to the proper surface acidity and redox capacity of the catalyst, which might be correlated with higher dispersion and more appropriate valence distribution of Fe species caused by the moderate CNTs doping content. This work provides a fundamental understanding on Fe3+/Fe2+ synergistic effect of NH3‐SCR, which is propitious for the rational design and optimization of Fe‐based oxide low‐temperature denitrification (de‐NOx) catalysts.

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Section: Resultsmentioning

confidence: 93%

Section: Chemistryselectmentioning

confidence: 99%

Low‐Temperature NH₃ Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

Liu

et al. 2023

ChemistrySelect

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“…Moreover, there is a positive correlation between the area of the reduction peak and H 2 consumption. 37,38 As illustrated in Figure 6(b), the peak area for Mn 3 Fe 2 Nb 0.01 O x was the largest, suggesting that it possesses the most potent reducing capability. This enhances its denitrification efficiency, particularly at low temperatures.…”

Section: H 2 -Tprmentioning

confidence: 97%

Effect of Nb‐doping on the MnFeO_x catalyst for NH₃‐SCR reaction at low‐temperature

Pei,

Zhao,

Wang

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDManganese‐based catalysts were considered the most promising catalysts for low‐temperature selective catalytic reduction (NH3‐SCR) reactions. In this work, a series of Mn3Fe2NbyOx catalysts were synthesized by co‐precipitation method for low‐temperature NH3‐SCR and SO2 tolerance tests.RESULTSThe catalysts were characterized by BET, SEM, XRD, XPS, H2‐TPR, and NH3‐TPD. Mn3Fe2Nb0.01Ox exhibited exceptionally high activity with a conversion of almost 100% from 80°C to 240°C, and a NO conversion of more than 75% at 40°C, while the NO conversion at 140°C in the presence of 100 ppm SO2 remained above 90% for 4 h.CONCLUSIONAccording to the characterization results, Nb modification can expand the specific surface area of the catalyst, improve the structure of the catalyst, and make the active components on the catalyst surface more dispersed. Moreover, the Nb‐modified catalyst reduced the content of Mn2+ on the catalyst surface and strengthened the electronic interactions between elements. The synergistic effects among Mn, Fe, and Nb facilitate the formation of more chemically adsorbed oxygen, which enhances the reduction capacity of the catalyst. This facilitates the adsorption of NH3 by the catalyst at low temperatures and promotes the process of low‐temperature NH3‐SCR reaction. More importantly, the Nb‐modified catalyst possessed more weak acid sites, and the higher surface acidity was conducive to the inhibition of SO3 generation, which enhanced the sulfur poisoning resistance of the catalyst. © 2024 Society of Chemical Industry (SCI).

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“…In addition to vanadium-based catalysts, manganese-based catalysts based on low cost, environmental protection, and excellent low-temperature NH 3 –SCR reaction performance have attracted widespread attention. However, the problems of poor performance of single-component, carrier-free, Mn-based catalysts for SO 2 resistance and the narrow working temperature window limit their practical application. − To broaden the active temperature window of Mn-based catalysts, researchers have carried out extensive work to tune the electronic structure of Mn-based oxides by modifying/doping other transition metal oxides to improve their redox performance. − Qiao et al prepared porous bimetallic Mn 2 Co 1 O x catalysts using metallic Co for doping Mn-based oxides. The strong interaction between Mn and Co in the catalyst resulted in a large number of acidic sites on the catalyst.…”

Section: Application Of Porous Metal Oxide Catalysts For Catalytic Pu...mentioning

confidence: 99%

Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

Zhou,

Wang,

Gao

et al. 2024

ACS Catal.

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Because of their special physicochemical properties, pore-structured metal oxide catalysts are widely used in environmental catalysis, energy chemicals, fuel cells, medicine, and other related fields. In recent years, these oxides have also been increasingly studied in the catalytic purification of diesel engine exhaust gases. In this paper, the research progresses of preparation methods of porous metal oxide catalysts and their application in the catalytic purification of diesel engine exhaust were reviewed. The advantages and disadvantages of different methods for the synthesis of porous metal oxide catalysts were elaborated, as well as the mechanism comparison of different types of porous metal oxide catalysts in catalytic purification of diesel engine exhaust pollutants. Finally, the current issues on the preparation of porous metal oxide catalysts and their development trends in application of diesel engine exhaust purification were summarized and discussed. The pore-structured metal oxide catalysts are beneficial for improving the contact efficiency between catalysts and pollutants, which can enhance the catalytic purification efficiency of catalysts. Meanwhile, the intrinsic activity is the most fundamental factor for determining their catalytic activity except for porous structure effects. In addition, this paper can help researchers to deeply understand the important effect of porous metal oxide catalysts in the treatment of diesel engine exhaust pollutants and provide theoretical guidance for the design and development of high-efficiency catalysts.

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Indium modified MnOx for high-efficient NH3-SCR De-NOx: Promotional role of indium and its catalytic performance

Cited by 8 publications

References 63 publications

Low‐Temperature NH₃ Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

Low‐Temperature NH₃ Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

Effect of Nb‐doping on the MnFeO_x catalyst for NH₃‐SCR reaction at low‐temperature

Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

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Indium modified MnOx for high-efficient NH3-SCR De-NOx: Promotional role of indium and its catalytic performance

Cited by 8 publications

References 63 publications

Low‐Temperature NH3 Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

Low‐Temperature NH3 Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

Effect of Nb‐doping on the MnFeOx catalyst for NH3‐SCR reaction at low‐temperature

Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

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Product

Resources

About

Low‐Temperature NH₃ Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

Low‐Temperature NH₃ Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

Effect of Nb‐doping on the MnFeO_x catalyst for NH₃‐SCR reaction at low‐temperature