A Probe into the Low-Temperature SCR Activity: NO Oxidative Activation to Nitrite-Intermediates

Dong, Yi; Zou, Renzhi; Zhou, Zhiying; Hu, Wenshuo; Ran, Mingchu; Song, Hao; Liu, Shaojun; Zheng, Chenghang; Gao, Xiang

doi:10.1007/s10562-021-03686-6

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…Furthermore, three new bands can be observed at 1547, 1270 and 1354 cm À1 . The former two bands can be assigned to monodentate nitrate species, 29,30 while the last one may be ascribed to the monodentate carbonate species. 13,31 By comparison, it is found that the band attributed to nitrate species increases in intensity, while the bands assigned to NO 2 /NO 2 À species decline in intensity.…”

Section: Verification Of the Relationship Between Co 2 And Nh 3 /No X...mentioning

confidence: 99%

Revealing the influencing mechanism of CO₂ on SCR of NO_x with NH₃ over FeW mixed oxide catalyst: interactions of carbonate-Fe₂O₃–FeWO₄

Wang,

Qiao,

et al. 2024

New J. Chem.

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Section: Verification Of the Relationship Between Co 2 And Nh 3 /No X...mentioning

confidence: 99%

Revealing the influencing mechanism of CO₂ on SCR of NO_x with NH₃ over FeW mixed oxide catalyst: interactions of carbonate-Fe₂O₃–FeWO₄

Wang,

Qiao,

et al. 2024

New J. Chem.

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“…SCR flue gas denitrification technology is a low-temperature (300-400℃) denitrification technology. The main reactor is arranged after the economizer, and the flue gas reacts with the reducing agent when flowing through the reactor with catalyst, NOx is reduced to N2 and H2O, SCR technology has high initial investment, but has high denitration efficiency (up to 90%) [15][16][17][18], so it has become the first choice for flue gas denitration.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation of Catalyst Deactivation Caused by Transient Turbulence in Gradient Flow Field

Li,

Zhiguo,

Zhang

2024

Waste Biomass Valor

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In SCR system, the velocity of flue gas field varies with the load, forming a gradient flow field. The characteristics of gradient flow field have important influence on the physical deactivation of catalyst. Through CFD simulation in this paper, it was found that the relative standard coefficients of flow field with characteristic flow velocity were 10.03%, 12.48% and 14.37% respectively. The uniformity of flow field deteriorated with the increase of flow velocity, and the alternating flow field was more likely to scour, wear and block the catalyst channel, leading to its inactivation. This conclusion is also confirmed by the test data obtained from the measuring points installed in various parts of the system. Through LES simulation, it is found that alternating flow field will generate transient turbulent vortices in the system, and with the increase of velocity, the number and distribution range of transient turbulent vortices increase rapidly. In the low-speed flow field, the flow field at the inlet Angle of the flue is disordered, and the velocity varies from 2.42m /s to 8.14m /s. At the corner of flue gas outlet, the flow velocity also varies between 4.86 m/s and 9.03 m/s, but there is laminar flow near the wall. The transient vortices are triggered by the laminar stripping mechanism near the wall. In high velocity flow field, the number of turbulent vortices increases sharply, especially on the surface of the first layer catalyst, which has a great influence on its activity.

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“…In recent decades, there has been an exponential increase in exhaust pollution, posing significant dangers to human health and natural systems. − Because nitrogen oxides (NO x ) will cause acid rain, photochemical smog, and damage to the ozone layer, removing NO x from the exhaust gas of various combustion sources (e.g., industrial pollution and vehicle exhaust) is one of the key steps toward pollution control. − Ammonia-selective catalytic reduction (NH 3 -SCR) is currently the most effective technology for NO x reduction. − However, commercialized SCR catalysts (V 2 O 5 /WO 3 /TiO 2 ) typically require an additional heat source to reach the working temperature of around 350–400 °C, which significantly increases the cost and thus is not suitable for most nonelectric factories as indicated in the previous references. − Thus, the scientific research area is focusing on low-temperature (LT) SCR (<300 °C) reactions, − which have become a current hot spot and a future trend of SCR catalyst studies.…”

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confidence: 99%

Probing the Atomistic Reaction Pathways in CuO/C Catalysts

Hu,

Zheng,

et al. 2023

Nano Lett.

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CuO x /C catalysts have been used in the selective catalytic reduction of NO x because of the exceptional low-temperature denitration (de-NO x ) activity. A fundamental understanding of the reaction between CuO and C is critical for controlling the component of CuO x /C and thus optimizing the catalytic performance. In this study, a transmission electron microscope equipped with an in situ heating device was utilized to investigate the atomic-scale reaction between CuO and C. We report two reaction mechanisms relying on the volume ratio between C and CuO: (1) The reduction from CuO to Cu2O (when the ratio is < ∼31%); (2) the reduction of CuO into polycrystalline Cu (when the ratio is > ∼34%). The atomistic reduction pathway can be well interpreted by considering the diffusion of O vacancy through the first-principle calculations. The atomic-scale exploration of CuO/C offers ample prospects for the design of industrial de-NO x catalysts in the future.

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A Probe into the Low-Temperature SCR Activity: NO Oxidative Activation to Nitrite-Intermediates

Cited by 10 publications

References 38 publications

Revealing the influencing mechanism of CO₂ on SCR of NO_x with NH₃ over FeW mixed oxide catalyst: interactions of carbonate-Fe₂O₃–FeWO₄

Revealing the influencing mechanism of CO₂ on SCR of NO_x with NH₃ over FeW mixed oxide catalyst: interactions of carbonate-Fe₂O₃–FeWO₄

Experimental and Numerical Simulation of Catalyst Deactivation Caused by Transient Turbulence in Gradient Flow Field

Probing the Atomistic Reaction Pathways in CuO/C Catalysts

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A Probe into the Low-Temperature SCR Activity: NO Oxidative Activation to Nitrite-Intermediates

Cited by 10 publications

References 38 publications

Revealing the influencing mechanism of CO2 on SCR of NOx with NH3 over FeW mixed oxide catalyst: interactions of carbonate-Fe2O3–FeWO4

Revealing the influencing mechanism of CO2 on SCR of NOx with NH3 over FeW mixed oxide catalyst: interactions of carbonate-Fe2O3–FeWO4

Experimental and Numerical Simulation of Catalyst Deactivation Caused by Transient Turbulence in Gradient Flow Field

Probing the Atomistic Reaction Pathways in CuO/C Catalysts

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Revealing the influencing mechanism of CO₂ on SCR of NO_x with NH₃ over FeW mixed oxide catalyst: interactions of carbonate-Fe₂O₃–FeWO₄

Revealing the influencing mechanism of CO₂ on SCR of NO_x with NH₃ over FeW mixed oxide catalyst: interactions of carbonate-Fe₂O₃–FeWO₄