A γ-Fe2O3-modified nanoflower-MnO2/attapulgite catalyst for low temperature SCR of NOx with NH3

Xie, Aijuan; Tao, Yiyang; Xiang, Jin; Gu, Pengfei; Huang, Xiaoyan; Zhou, Xingmeng; Yao, Chao; Li, Xiazhang

doi:10.1039/c8nj04524k

Cited by 24 publications

(9 citation statements)

References 54 publications

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“…Attapulgite (ATP), which possessed abundant reserves in nature and was readily available, was a kind of water-containing magnesium-rich aluminum silicate clay mineral with a layered-chain structure. , Moreover, ATP owned large specific surface area and outstanding adsorption capability and was also a kind of environmentally friendly material, rendering it a promising prospect in becoming an appropriate catalyst carrier substitute. , Actually, ATP had indeed been used as a carrier to prepare NH 3 -SCR catalysts among several related studies. ,− Luo et al reported that TiO 2 -mixed ATP carrier supported γ-MnO 2 catalysts possessed nearly 100% NO x conversion within the scope of 200–300 °C . Zhou et al found that ATP supported γ-Fe 2 O 3 catalysts had a NO x conversion of 80–90% within 300–400 °C, while the NO x conversion of the ATP supported Mn–Fe oxide composite could be increased to nearly 100% within 250–300 °C .…”

Section: Introductionmentioning

confidence: 99%

“…16,17 Moreover, ATP owned large specific surface area and outstanding adsorption capability and was also a kind of environmentally friendly material, rendering it a promising prospect in becoming an appropriate catalyst carrier substitute. 18,19 Actually, ATP had indeed been used as a carrier to prepare NH 3 -SCR catalysts among several related studies. 16,18−20 17 Zhou et al found that ATP supported γ-Fe 2 O 3 catalysts had a NO x conversion of 80−90% within 300−400 °C, while the NO x conversion of the ATP supported Mn−Fe oxide composite could be increased to nearly 100% within 250−300 °C.…”

Section: ■ Introductionmentioning

confidence: 99%

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Self-Defense Effects of Ti-Modified Attapulgite for Alkali-Resistant NO_x Catalytic Reduction

Zhao

Shi

Shen

et al. 2022

Environ. Sci. Technol.

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Nowadays, the serious deactivation of deNO x catalysts caused by alkali metal poisoning was still a huge bottleneck in the practical application of selective catalytic reduction of NO x with NH3. Herein, alkali-resistant NO x catalytic reduction over metal oxide catalysts using Ti-modified attapulgite (ATP) as supports has been originally demonstrated. The self-defense effects of Ti-modified ATP for alkali-resistant NO x catalytic reduction have been clarified. Ti-modified ATP with self-defense ability was obtained by removing alkaline metal cation impurities in the natural ATP materials without destroying its initial layered-chain structure through the ion-exchange procedure, accompanied with an obvious enrichment of Brønsted acid and Lewis acid sites. The self-defense effects embodied that both ion-exchanged Ti octahedral centers and abundant Si–OH sites in the Ti-ion-exchange-modified ATP could effectively anchor alkali metals via coordinate bonding or ion-exchange process, which induced alkali metals to be immobilized by the Ti-ion-exchange-modified ATP carrier rather than impair active species. Under this special protection of self-defense effects, Ti-ion-exchange-modified ATP supported catalysts still retained plentiful acidic sites and superior redox ability even after alkali metal poisoning, giving rise to the maintenance of sufficient NH x and NO x adsorption and the subsequent efficient reaction, which in turn resulted in high NO x catalytic reduction capacity of the catalyst. The strategy provided new inspiration for the development of novel and efficient selective catalytic reduction of NO x with NH3 (NH3-SCR) catalysts with high alkali resistance.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Self-Defense Effects of Ti-Modified Attapulgite for Alkali-Resistant NO_x Catalytic Reduction

Zhao

Shi

Shen

et al. 2022

Environ. Sci. Technol.

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“…[ 478 ] Among many catalysts, MnO 2 ‐based catalysts have attracted much attention due to their high SCR reaction activity. [ 175,201,479–483 ]…”

Section: Environmental Applicationsmentioning

confidence: 99%

MnO₂‐Based Materials for Environmental Applications

et al. 2021

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Manganese dioxide (MnO2) is a promising photo–thermo–electric‐responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2‐based composites via the construction of homojunctions and MnO2/semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2‐based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high‐efficiency MnO2‐based materials for comprehensive environmental applications is provided.

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“…117,118 For the pure MnO x catalyst, the ''synergistic poisoning'' of H 2 O and SO 2 accelerated the formation of metal sulfate and ammonium sulfate on the surface, which expedited the deactivation of the catalyst. 119 Choosing other metals as sacrificial sites to safeguard active MnO x species was also an effective way to enhance the resistance of catalysts to SO 2 . Investigations indicated that the modification of MnO x with Sb enormously ameliorated the resistance to SO 2 .…”

Section: Poisoning Mechanism and Poison-resistant Measures Of Somentioning

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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A γ-Fe₂O₃-modified nanoflower-MnO₂/attapulgite catalyst for low temperature SCR of NO_x with NH₃

Abstract: A novel mesoporous γ-Fe2O3-modified nanoflower-MnO2/attapulgite catalyst has been fabricated through a facile hydrothermal method and used for low temperature SCR of NOx with NH3.

Cited by 24 publications

References 54 publications

Self-Defense Effects of Ti-Modified Attapulgite for Alkali-Resistant NO_x Catalytic Reduction

Self-Defense Effects of Ti-Modified Attapulgite for Alkali-Resistant NO_x Catalytic Reduction

MnO₂‐Based Materials for Environmental Applications

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

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A γ-Fe2O3-modified nanoflower-MnO2/attapulgite catalyst for low temperature SCR of NOx with NH3

Abstract: A novel mesoporous γ-Fe2O3-modified nanoflower-MnO2/attapulgite catalyst has been fabricated through a facile hydrothermal method and used for low temperature SCR of NOx with NH3.

Cited by 24 publications

References 54 publications

Self-Defense Effects of Ti-Modified Attapulgite for Alkali-Resistant NOx Catalytic Reduction

Self-Defense Effects of Ti-Modified Attapulgite for Alkali-Resistant NOx Catalytic Reduction

MnO2‐Based Materials for Environmental Applications

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

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Product

Resources

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A γ-Fe₂O₃-modified nanoflower-MnO₂/attapulgite catalyst for low temperature SCR of NO_x with NH₃

Self-Defense Effects of Ti-Modified Attapulgite for Alkali-Resistant NO_x Catalytic Reduction

Self-Defense Effects of Ti-Modified Attapulgite for Alkali-Resistant NO_x Catalytic Reduction

MnO₂‐Based Materials for Environmental Applications

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