Morphology effect of tungsten oxide on Ce/W catalyst for selective catalytic reduction of NO with NH3: Influence of structure-directing agents

He, Jun-fei; Xiong, Zhibo; Du, Yanping; Lu, Wei; Tian, Su-le

doi:10.1016/j.joei.2020.11.003

Cited by 15 publications

(5 citation statements)

References 66 publications

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“…The calculated Ce 3+ content (F(Ce 3+ )) was only 16.76% in CeO 2 . With the increase of W content, F(Ce 3+ ) increased in the proportions of 19.98, 22.68, and 29.77% in CeO 2 -W-L, CeO 2 -W-M, and CeO 2 -W-H, respectively, suggesting that the introduced W–O species on CeO 2 -W changed the state of Ce promoting the generation of Ce 3+ . , We also investigated the valence states of Ce elements on CeO 2 -S catalysts. It was observed that with the increase of S loading, the Ce 3+ contents in CeO 2 , CeO 2 -S-L, CeO 2 -S-M, and CeO 2 -S-H catalysts were also increased in a sequential trend of 16.76, 18.84, 20.02, and 26.62%, respectively.…”

Section: Resultsmentioning

confidence: 99%

Revealing the Dynamic Behavior of Active Sites on Acid-Functionalized CeO₂ Catalysts for NO_x Reduction

et al. 2023

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Unraveling the dynamics of the active sites upon CeO2-based catalysts in selective catalytic reduction of nitrogen oxides by ammonia (NH3-SCR) is challenging. In this work, we prepared tungsten-acidified and sulfated CeO2 catalysts and used operando spectroscopy to reveal the dynamics of acid sites and redox sites on catalysts during NH3-SCR reaction. We found that both Lewis and Brønsted acid sites are needed to participate in the catalytic reaction. Notably, Brønsted acid sites are the main active sites after a tungsten-acidified or sulfated treatment, and the change of Brønsted acid sites significantly affects the NO x removal. Moreover, acid functionalization promotes the cerium species cycle between Ce4+ and Ce3+ for the NO x reduction. This work is critical to deeply understanding the natural properties of active sites, and it also provides new insights into the mechanism for NH3-SCR over CeO2-based catalysts.

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Section: Resultsmentioning

confidence: 99%

Revealing the Dynamic Behavior of Active Sites on Acid-Functionalized CeO₂ Catalysts for NO_x Reduction

et al. 2023

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“…This phenomenon indicates that the epoxy groups of GO have been eliminated in the reduction process of GO to rGO (Figure S17d). − Besides, the zeta potential measurements indicate that main interactions among polyanions 1a and Au NPs and rGO are electrostatic. , …”

Section: Resultsmentioning

confidence: 99%

Cerium-Encapsulated Sb^III–Se^IV-Templating Polyoxotungstate for Electrochemically Sensing Human Multidrug Resistance Gene Segment

et al. 2023

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A tower-like SbIII–SeIV-templating polyoxotungstate [H2N(CH3)2]12Na7H3[Ce0.5/Na0.5(H2O)5]2[SbSe2W21O75]2·50H2O (1) was synthesized, whose skeleton is assembled from two prolonged lacunary Dawson [SbSe2W21O75]13– units and two [Ce0.5/Na0.5(H2O)5]2+ linkers. The uncommon [SbSe2W21O75]13– unit can be viewed as a combination of one [SeW6O21]2– group grafted onto a trivacant Dawson [SbSeW15O54]11– subunit. The conductive composite 1-Au@rGO containing 1, gold nanoparticles, and reduced graphene oxide (rGO) was conveniently prepared, using which the 1-Au@rGO-based electrochemical genosensor was constructed for detecting human multidrug resistance gene segment. This work enriches structural types of dual-heteroatom-inserted polyoxometalates and promotes the application of polyoxometalates in genosensors.

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“…When CeO 2 is used as a carrier, it can not only effectively disperse the active species, but also adjust the interaction between CeO 2 and the surface of the active components through the electronic effect, and improve the SCR performance of the catalyst. For example, He et al ( He et al, 2021 ) supported WO 3 with different morphologies on CeO 2 by the method of isovolumetric impregnation (as shown in Figure 3 ), and the results showed that due to the interaction of W ions and Ce ions, a new Ce 4+ +W 5+ The formation of Ce 3+ +W 6+ redox cycle greatly promotes the redox performance of the catalyst. Among them, compared with nanorods (W-NR) and nanorod self-assembled microspheres (W-MP), WO 3 nanoparticles (W-NP) have the best redox ability, and its W 5+ /(W 5+ +W 6+ ) The molar ratio of α is the largest, and the concentration of Ce 4+ on the surface of Ce/W-NPs is the highest, which exhibits the best redox performance, thereby promoting the SCR performance.…”

Section: Research On Scr Denitration Catalyst At Wide Temperaturementioning

confidence: 99%

Progress of selective catalytic reduction denitrification catalysts at wide temperature in carbon neutralization

et al. 2022

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With the looming goal of carbon neutrality and increasingly stringent environmental protection policies, gas purification in coal-fired power plants is becoming more and more intense. To achieve the NOx emission standard when coal-fired power plants are operating at full load, wide-temperature denitrification catalysts that can operate for a long time in the range of 260–420°C are worthy of study. This review focuses on the research progress and deactivation mechanism of selective catalytic reduction (SCR) denitration catalysts applied to a wide temperature range. With the increasing application of SCR catalysts, it also means that a large amount of spent catalysts is generated every year due to deactivation. Therefore, it is necessary to recycle the wide temperature SCR denitration catalyst. The challenges faced by wide-temperature SCR denitration catalysts are summarized by comparing their regeneration processes. Finally, its future development is prospected.

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Morphology effect of tungsten oxide on Ce/W catalyst for selective catalytic reduction of NO with NH3: Influence of structure-directing agents

Cited by 15 publications

References 66 publications

Revealing the Dynamic Behavior of Active Sites on Acid-Functionalized CeO₂ Catalysts for NO_x Reduction

Revealing the Dynamic Behavior of Active Sites on Acid-Functionalized CeO₂ Catalysts for NO_x Reduction

Cerium-Encapsulated Sb^III–Se^IV-Templating Polyoxotungstate for Electrochemically Sensing Human Multidrug Resistance Gene Segment

Progress of selective catalytic reduction denitrification catalysts at wide temperature in carbon neutralization

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Morphology effect of tungsten oxide on Ce/W catalyst for selective catalytic reduction of NO with NH3: Influence of structure-directing agents

Cited by 15 publications

References 66 publications

Revealing the Dynamic Behavior of Active Sites on Acid-Functionalized CeO2 Catalysts for NOx Reduction

Revealing the Dynamic Behavior of Active Sites on Acid-Functionalized CeO2 Catalysts for NOx Reduction

Cerium-Encapsulated SbIII–SeIV-Templating Polyoxotungstate for Electrochemically Sensing Human Multidrug Resistance Gene Segment

Progress of selective catalytic reduction denitrification catalysts at wide temperature in carbon neutralization

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Resources

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Revealing the Dynamic Behavior of Active Sites on Acid-Functionalized CeO₂ Catalysts for NO_x Reduction

Revealing the Dynamic Behavior of Active Sites on Acid-Functionalized CeO₂ Catalysts for NO_x Reduction

Cerium-Encapsulated Sb^III–Se^IV-Templating Polyoxotungstate for Electrochemically Sensing Human Multidrug Resistance Gene Segment