Novel metal-organic framework supported manganese oxides for the selective catalytic reduction of NOx with NH3: Promotional role of the support

Sun, Hong; Liu, Zhigang; Wang, Ying; Quan, Xie; Zhao, Guozhi

doi:10.1016/j.jhazmat.2019.120800

Cited by 40 publications

(18 citation statements)

References 62 publications

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“…With the increase in the adsorption time, NO – species is gradually oxidized to monodentate nitrate (1299 cm –1 ) and NO 2 – (1407 cm –1 ) species. ,, In comparison, only the linear nitrite (1481 cm –1 ), monodentate nitrite (1315 cm –1 ), and NO 2 – (1406 cm –1 ) with much higher adsorption intensity are found over SM-E, while the adsorption and transformation of NO – are not observed, which might be due to the quite fast transformation of NO – over appropriate Mn–Mn sites that are exposed after etching, which ensures the NO x adsorption to stay at a balanced state. , Meanwhile, more adsorbed species are noticed over the S-M but with much lower adsorption intensity. In the first 10 min of NO + O 2 adsorption, the absorption bands of bidentate nitrate (1555 cm –1 ), monodentate nitrate (1287 cm –1 ), and NO – species (1194 cm –1 ) appear successively. ,, After 10 min, however, NO – species also weakens rapidly, followed by the gradually enhanced band of bridge nitrate (1261 cm –1 ) . This is because only Mn–O site exists in the S-M catalyst so that NO x can only adsorb on Mn–O sites and be strongly oxidized into the stably inert nitrate species.…”

Section: Resultsmentioning

confidence: 99%

Ultralow-Temperature NO_x Reduction over SmMn₂O₅ Mullite Catalysts Via Modulating the Superficial Dual-Functional Active Sites

Wang

Lan

et al. 2022

ACS Catal.

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The development of highly efficient catalysts for low-temperature NO x abatement still existed as a scabrous issue. An acid-etched mullite-type SmMn2O5 catalyst (SM-E) was developed and applied in ultralow-temperature selective catalytic reduction of NO x with NH3 (NH3-SCR) to meet the increasingly rigorous demands of emission control in the nonelectric industry, which can convert more than 90% NO x in a wide operating window (90–200 °C). It has been demonstrated that NO can be preferably adsorbed and activated on the unique Mn–Mn dimer sites and further react with the adsorbed NH3 on adjacent Mn–O sites over the SM-E catalyst. The synergistic effects of these abundant exposed dual-functional active sites on the SM-E catalyst contributed to the extraordinary NH3-SCR performance compared to the pristine SmMn2O5 catalyst exposing deficient active sites as well as the Sm–Mn composite oxides containing sole Mn–O sites. This work sheds light on a novel strategy to deeply study the structure–performance relationship and provides deep insights into the rational design of NH3-SCR catalysts for ultralow-temperature NO x abatement.

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Section: Resultsmentioning

confidence: 99%

Ultralow-Temperature NO_x Reduction over SmMn₂O₅ Mullite Catalysts Via Modulating the Superficial Dual-Functional Active Sites

Wang

Lan

et al. 2022

ACS Catal.

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“…[104] Sun et al also demonstrated that the strong interaction between Mn species and MIL-125(Ti) allowed the highly dispersed Mn and the high Mn 4 + /Mn 3 + ratio in MnO x @MIL-125(Ti) catalyst, which are highly desirable for NH 3 À SCR. [105] The loading method also has a significant effect on the MOFs supported catalyst for NH 3 À SCR.…”

Section: Metal Organic Framework (Mofs)mentioning

confidence: 99%

Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NO_x

Guo

Yang

2020

ChemCatChem

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Nitrogen oxides, including NO and NO 2 , are notorious air pollutants. The selective catalytic reduction of NO x with NH 3 (NH 3 À SCR) is the most widely studied and used technology for NO x removal. The spatially confined architectures in porous materials are promising designs for NH 3 À SCR catalysts. Porous metal oxides, metal-based zeolite, and the metal organic frameworks catalysts, featuring active sites disperse in the pores, cavities, and frameworks, are the most widely studied NH 3 À SCR catalysts. In this review, we review the application of these three typical catalysts for NH 3 À SCR, emphasizing the spatial confined structure provided by the porous materials.

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“…There were three general reactions, which were called standard SCR, fast SCR, and NO 2 SCR reactions [7,32]. The catalyst performance was found to be a dominant factor for the above-mentioned reactions [11,33]. In the present study, we employed two pretreatment methods including SA deposition and plasma treatment to modify the PPS NPFF before the impregnation process to help improve the catalyst loading rate and stability, which was expected to be conducive for the NH 3 -SCR denitration activity.…”

Section: Denitration Mechanism and Performancementioning

confidence: 99%

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Chen

et al. 2020

Polymers

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Development of a novel filter material is urgently required for replacing the high-cost flue gas purification technology in the simultaneous removal of both fine dust and Nitrogen oxides (NOx). In this study; polyphenylene sulfide (PPS) needle-punching fibrous felts (NPFF) were employed as the filter material to remove the fine dust; and in the meanwhile; Mn and Ce oxides were loaded onto the PPS NPFF as the catalyst for selective catalytic reduction of NOx with NH3. Two different pretreatment methods; i.e., sodium alginate (SA) deposition and plasma treatment; were employed to modify the PPS NPFF before the traditional impregnation and thermal treatment processes during the catalyst loading. The results showed that these two pretreatment methods both afforded the PPS NPFF with the enhanced loading rate and stability of Mn/Ce oxides compared to those without any pretreatments; which were significantly beneficial for the denitration application. Moreover; we found that both SA deposition and plasma pre-treated samples presented excellent dust-removal properties; and the filtration efficiency could reach 100% when the particle size of the fine particulates was above 4 μm. This study demonstrated that our Mn/Ce oxides decorated PPS NPFF have great potential to be applied in the fuel gas purification field; due to their stable structure; handling convenience; and excellent filtration efficiency; as well as high denitration performance.

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Novel metal-organic framework supported manganese oxides for the selective catalytic reduction of NOx with NH3: Promotional role of the support

Cited by 40 publications

References 62 publications

Ultralow-Temperature NO_x Reduction over SmMn₂O₅ Mullite Catalysts Via Modulating the Superficial Dual-Functional Active Sites

Ultralow-Temperature NO_x Reduction over SmMn₂O₅ Mullite Catalysts Via Modulating the Superficial Dual-Functional Active Sites

Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NO_x

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

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Novel metal-organic framework supported manganese oxides for the selective catalytic reduction of NOx with NH3: Promotional role of the support

Cited by 40 publications

References 62 publications

Ultralow-Temperature NOx Reduction over SmMn2O5 Mullite Catalysts Via Modulating the Superficial Dual-Functional Active Sites

Ultralow-Temperature NOx Reduction over SmMn2O5 Mullite Catalysts Via Modulating the Superficial Dual-Functional Active Sites

Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NOx

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

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Product

Resources

About

Ultralow-Temperature NO_x Reduction over SmMn₂O₅ Mullite Catalysts Via Modulating the Superficial Dual-Functional Active Sites

Ultralow-Temperature NO_x Reduction over SmMn₂O₅ Mullite Catalysts Via Modulating the Superficial Dual-Functional Active Sites

Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NO_x