Time-resolved in situ DRIFTS study on NH3-SCR of NO on a CeO2/TiO2 catalyst

Yang, Jie; Ren, Shan; Wang, Mingming; Chen, Zhicaho; Chen, Lin; Liu, Lian

doi:10.1039/d1cy02089g

Cited by 51 publications

(9 citation statements)

References 40 publications

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“…Therefore, the results above provided direct evidence for the regeneration of the vanadyl species identified by our DFT calculations, where NO 2 oxidizes V 3+ to V 5+ , synchronized with the release of NO (F → G in Figures and ). In addition, the ammonium nitrate route has been proposed as a low-temperature FSCR mechanism. ,, But we demonstrated that the “ammonium nitrate route” is not the main pathway in our V 2 O 5 /TiO 2 catalytic system by NO 2 –SCR and NO 2 –SCR-TPD experiments (Figure ). N 2 O is the inevitable species for the decomposition of NH 4 NO 3 below 300 °C (Figure S18).…”

Section: Resultsmentioning

confidence: 72%

“…In addition, the ammonium nitrate route has been proposed as a lowtemperature FSCR mechanism. 14,28,55 But we demonstrated that the "ammonium nitrate route" is not the main pathway in our V 2 O 5 /TiO 2 catalytic system by NO 2 −SCR and NO 2 − SCR-TPD experiments 7). N 2 O is the inevitable species for the decomposition of NH 4 NO 3 below 300 °C (Figure S18).…”

Section: −mentioning

confidence: 73%

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Uncovering the Dinuclear Mechanism of NO₂-Involved NH₃–SCR over Supported V₂O₅/TiO₂ Catalysts

Li,

Gao,

et al. 2023

Environ. Sci. Technol.

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Commercial vanadium oxide catalysts exhibit high efficiency for the selective catalytic reduction (SCR) of NO with NH3, especially in the presence of NO2 (i.e., occurrence of fast NH3–SCR). The high-activity sites and their working principle for the fast NH3–SCR reaction, however, remain elusive. Here, by combining in situ spectroscopy, isotopic labeling experiments, and density functional theory (DFT) calculations, we demonstrate that polymeric vanadyl species act as the main active sites in the fast SCR reaction because the coupling effect of the polymeric structure alters the elementary reaction step and effectively avoids the high energy barrier of the rate-determining step over monomeric vanadyl species. This study unveils the high-activity dinuclear mechanism of the NO2-involved SCR reaction over vanadia-based catalysts and provides a fundamental basis for developing high-efficiency and low V2O5-loading SCR catalysts.

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Section: Resultsmentioning

confidence: 72%

Section: −mentioning

confidence: 73%

Uncovering the Dinuclear Mechanism of NO₂-Involved NH₃–SCR over Supported V₂O₅/TiO₂ Catalysts

Li,

Gao,

et al. 2023

Environ. Sci. Technol.

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“…8(a). [53][54][55] Fig. 8(c) shows the in situ infrared spectrum of the CuCe/ VMT(M) catalyst for the co-adsorption of NO and CO.…”

Section: Reaction Mechanism Researchmentioning

confidence: 99%

CuCeO_x/VMT powder and monolithic catalyst for CO-selective catalytic reduction of NO with CO

Liu

et al. 2022

New J. Chem.

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“…On the other hand, TiO 2 has three main crystalline structures including rutile, anatase and brookite [19], where rutile and anatase are popularly used for photocatalysts and SCR catalysts [20][21][22]. Compositing CeO 2 /TiO 2 compound is an available method to improve the catalytic properties, and which has been studied as excellent photocatalysts [23][24][25] or SCR catalysts [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Catalytic properties of CeO₂/TiO₂ synthesized by different methods towards the organic dye photodegradation and NH₃ selected catalytic removal of NO_x

Ning,

He,

et al. 2023

Phys. Scr.

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In this work, three synthesis methods including photo-chemical, precipitation and hydrothermal were applied for synthesizing CeO2/TiO2 catalysts, and the catalytic performance including photodegradation degrees for organic pollutant and ammonia selective catalytic reduction (NH3-SCR) for NO removal were investigated. It was found that the photo-chemical synthesized CeO2-TiO2-PC exhibited the best photodegradation ability for methylene blue (MB), which had the degradation ratio of 91.21 % and was approximately 23.92 % higher than that with the matrix of rutile TiO2. The formed Ce-Ti heterojunction enhanced the separation of e-/h+ and further promoted the photocatalytic properties. Moreover, the CeO2-TiO2-PC, and the CeO2-TiO2-P which synthesized by the precipitation method showed better NH3-SCR properties than that of hydrothermal synthesized CeO2-TiO2-H below 300 oC, while the CeO2-TiO2-H owned an outstanding NH3-SCR performance above 300 oC. The difference on the NH3-SCR properties may be major attributed to the acid sites, pore structures and surface areas on the surface of different catalysts.

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Time-resolved in situ DRIFTS study on NH₃-SCR of NO on a CeO₂/TiO₂ catalyst

Abstract: Ce–Ti catalysts were considered as promising replacement for V–Ti based catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NO and NO2) with NH3. In this work, CeO2/TiO2 catalyst was...

Cited by 51 publications

References 40 publications

Uncovering the Dinuclear Mechanism of NO₂-Involved NH₃–SCR over Supported V₂O₅/TiO₂ Catalysts

Uncovering the Dinuclear Mechanism of NO₂-Involved NH₃–SCR over Supported V₂O₅/TiO₂ Catalysts

CuCeO_x/VMT powder and monolithic catalyst for CO-selective catalytic reduction of NO with CO

Catalytic properties of CeO₂/TiO₂ synthesized by different methods towards the organic dye photodegradation and NH₃ selected catalytic removal of NO_x

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Time-resolved in situ DRIFTS study on NH3-SCR of NO on a CeO2/TiO2 catalyst

Abstract: Ce–Ti catalysts were considered as promising replacement for V–Ti based catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NO and NO2) with NH3. In this work, CeO2/TiO2 catalyst was...

Cited by 51 publications

References 40 publications

Uncovering the Dinuclear Mechanism of NO2-Involved NH3–SCR over Supported V2O5/TiO2 Catalysts

Uncovering the Dinuclear Mechanism of NO2-Involved NH3–SCR over Supported V2O5/TiO2 Catalysts

CuCeOx/VMT powder and monolithic catalyst for CO-selective catalytic reduction of NO with CO

Catalytic properties of CeO2/TiO2 synthesized by different methods towards the organic dye photodegradation and NH3 selected catalytic removal of NOx

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Time-resolved in situ DRIFTS study on NH₃-SCR of NO on a CeO₂/TiO₂ catalyst

Uncovering the Dinuclear Mechanism of NO₂-Involved NH₃–SCR over Supported V₂O₅/TiO₂ Catalysts

Uncovering the Dinuclear Mechanism of NO₂-Involved NH₃–SCR over Supported V₂O₅/TiO₂ Catalysts

CuCeO_x/VMT powder and monolithic catalyst for CO-selective catalytic reduction of NO with CO

Catalytic properties of CeO₂/TiO₂ synthesized by different methods towards the organic dye photodegradation and NH₃ selected catalytic removal of NO_x