Reaction mechanism for NH3-SCR of NOx over CuMn2O4 catalyst

Yang, Yingju; Liu, Jing; Liu, Feng; Wang, Zhen; Ding, Junyan; Huang, Hao

doi:10.1016/j.cej.2018.12.103

Cited by 154 publications

(53 citation statements)

References 38 publications

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“…[ 1 ] The massive emission of NO has resulted in series of environmental issues, including acid rain, photochemical smog, and ozone depletion, which directly threatens human health. [ 2 ] Currently, the selective catalytic reduction technology has been universally adopted for NO removal. [ 3 ] Utilizing ammonia (NH 3 ) or hydrogen (H 2 ) as the reductant, NO can be converted into harmless nitrogen (N 2 ) at a temperature above 300 °C.…”

Section: Introductionmentioning

confidence: 99%

A Feasible Strategy for Identifying Single‐Atom Catalysts Toward Electrochemical NO‐to‐NH₃ Conversion

Niu

Zhang

Wang

et al. 2021

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Combining NO removal and NH3 synthesis, electrochemical NO reduction reaction (NORR) toward NH3 is considered as a novel and attractive approach. However, exploring suitable catalysts for NO‐to‐NH3 conversion is still a formidable task due to the lack of a feasible method. Herein, utilizing systematic first‐principles calculations, a rational strategy for screening efficient single‐atom catalysts (SACs) for NO‐to‐NH3 conversion is reported. This strategy runs the gamut of stability, NO adsorbability, NORR activity, and NH3 selectivity. Taking transition metal atom embedded in C2N (TM‐C2N) as an example, its validity is demonstrated and Zr‐C2N is selected as a stable NO‐adsorbable NORR catalyst with high NH3 selectivity. Therefore, this work has established a theoretical landscape for screening SACs toward NO‐to‐NH3 conversion, which will contribute to the application of SACs for NORR and other electrochemical reactions.

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Section: Introductionmentioning

confidence: 99%

A Feasible Strategy for Identifying Single‐Atom Catalysts Toward Electrochemical NO‐to‐NH₃ Conversion

Niu

Zhang

Wang

et al. 2021

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101

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“…Nitrogen oxides (NO x , standing for NO and NO 2 ) are among the most harmful air pollutants which can lead to the formation of acid rain, photochemical fumes, ozone depletion, and climate change. − Governments and related institutions have paid considerable attention to reducing the emission of NO x from vehicle exhaust and electric power plants. , NH 3 selective catalytic reduction (NH 3 -SCR) of NO x has been considered as an advanced technology for the elimination of nitrogen oxides from coal-fired power plants owing to the low cost and high efficiency. , At present, in the field of fixed source denitrification, the V 2 O 5 /TiO 2 catalyst has attracted extensive interest due to its good selectivity, high catalytic activity at 260–450 °C, stable properties, anti-poisoning ability, and strong anti-aging performance. − Despite these considerable advantages, there are still some problems including narrow window of operation temperature, biological toxicity, and increasing energy consumption, which have impeded the practical application of the V 2 O 5 –WO 3 (MoO 3 )/TiO 2 catalyst system. − …”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Selective Catalytic Reduction of NO_x with NH₃ over Mn–Ce Composites Synthesized by Polymer-Assisted Deposition

et al. 2021

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The Mn x Ce y binary catalysts with a three-dimensional network structure were successfully prepared via a polymer-assisted deposition method using ethylenediaminetetraacetic acid and polyethyleneimine as complexing agents. The developed pore structure could facilitate the gas diffusion and accelerate the catalytic reaction for NH3 selective catalytic reduction (SCR). Moreover, the addition of Ce is beneficial for the exposure of active sites on the catalyst surface and increases the adsorption of the NH3 and NO species. Therefore, the Mn1Ce1 catalyst exhibits the best catalytic activity for NO x removal with a conversion rate of 97% at 180 °C, superior water resistance, and favorable stability. The SCR reaction over the Mn1Ce1 catalyst takes place through the E–R pathway, which is confirmed by the in situ diffuse reflectance Fourier transform analysis. This work explores a new strategy to fabricate multimetal catalysts and optimize the structure of catalysts.

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“…The high dispersion of Fe 3+ species ensured the acid and redox centers. Yang et al [166] studied the mechanism of NH 3 -SCR reaction of NO on CuMn 2 O 4 catalyst. Density functional theory calculation showed that the dehydrogenation of NH 3 was the decisive step of N 2 formation.…”

Section: Nh 3 -Scrmentioning

confidence: 99%

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Liu

et al. 2019

Catalysts

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Nitrogen oxides (NO x ) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NO x , it is urgent to control NO x . According to the different mechanisms of NO x removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NO x . At the same time, the current research status and existing problems of different NO x removal technologies were revealed and the future development prospects were forecasted.Catalysts 2019, 9, 771 2 of 39 adsorption, oxidation, reduction, and plasma methods. In view of these attentive findings, adsorption method uses recyclable solid adsorbent material to adsorb NO x from flue gas through microporous structure, remarkably, environmentally friendly, no secondary pollution, and energy-saving and -efficient features make it stand out [18][19][20]. The oxidation process is a method that oxidizes NO into NO 2 or N 2 O 3 with high solubility under the action of an oxidant that is then absorbed by water or alkali solution. The process is simple and cost-saving, and is widely used in the wet flue gas denitrification process with relatively low cost and high removal efficiency of NO x ; except that the oxidized NO and SO 2 can be removed simultaneously to produce high value-added products [21][22][23]. The reduction method has the characteristics of high efficiency, cleanliness, and mildness; NO x removal can be realized at low temperature at present [24][25][26]. The plasma method is used to modify the surface of the catalyst, the dispersion of active species can be improved by plasma treatment, and the stability and low temperature activity of catalyst can be improved [27,28].Seldom, if ever, does a comprehensive article to introduce the current situation and treatment methods of removing NO x . In this paper, we tried to renovate, classify, and summarize the significant perspectives and most relevant findings reported in recent research articles and earlier reviews generalizing the mechanism analysis and research progress of NO x removal by adsorption, oxidation, reduction, and plasma methods, which can provide means for promoting the technological progress of pollution prevention, maintaining healthy development of factories continuously, studying the methods of removing NO x deeply, and mastering different technologies of removing NO x , as well as providing guidance for controlling the emission of NO x from motor vehicles such as diesel, gasoline, and so on. In order to improve the environmental quality and save the ecological environment, this paper further provides a convenient, low-cost, efficient, and economic guidance line.

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Reaction mechanism for NH3-SCR of NOx over CuMn2O4 catalyst

Cited by 154 publications

References 38 publications

A Feasible Strategy for Identifying Single‐Atom Catalysts Toward Electrochemical NO‐to‐NH₃ Conversion

A Feasible Strategy for Identifying Single‐Atom Catalysts Toward Electrochemical NO‐to‐NH₃ Conversion

Low-Temperature Selective Catalytic Reduction of NO_x with NH₃ over Mn–Ce Composites Synthesized by Polymer-Assisted Deposition

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

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Reaction mechanism for NH3-SCR of NOx over CuMn2O4 catalyst

Cited by 154 publications

References 38 publications

A Feasible Strategy for Identifying Single‐Atom Catalysts Toward Electrochemical NO‐to‐NH3 Conversion

A Feasible Strategy for Identifying Single‐Atom Catalysts Toward Electrochemical NO‐to‐NH3 Conversion

Low-Temperature Selective Catalytic Reduction of NOx with NH3 over Mn–Ce Composites Synthesized by Polymer-Assisted Deposition

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

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A Feasible Strategy for Identifying Single‐Atom Catalysts Toward Electrochemical NO‐to‐NH₃ Conversion

A Feasible Strategy for Identifying Single‐Atom Catalysts Toward Electrochemical NO‐to‐NH₃ Conversion

Low-Temperature Selective Catalytic Reduction of NO_x with NH₃ over Mn–Ce Composites Synthesized by Polymer-Assisted Deposition