NO, NO2 and N2O emissions over a SCR using DOC and DPF systems with Pt reduction

Jung, Young-Dae; Pyo, Young Dug; Jang, Jinyoung; Kim, Gang Chul; Cho, Chong Pyo; Yang, Changho

doi:10.1016/j.cej.2019.03.137

Cited by 61 publications

(15 citation statements)

References 33 publications

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“…There are many technologies for removing NO x from flue gas, according to different principles, they can be divided into catalytic reduction and adsorption, besides, in the view of different working media, and they can be divided into dry and wet methods. Different treatment methods are selected according to the concentration of NO x tail gas and other working conditions [132][133][134]. Reduction denitrification technology includes selective noncatalytic reduction and selective catalytic reduction.…”

Section: Removal Of No X By Reductionmentioning

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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Section: Removal Of No X By Reductionmentioning

confidence: 99%

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

Liu

et al. 2019

Catalysts

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“…1 − 3 NO is the primary component of atmospheric NO x (∼90%); it is inert and has extremely low solubility in common solvents. Current industrial technologies for NO x reduction include selective catalytic reduction and selective noncatalytic reduction (SCR 4 and SNCR, 5 respectively). However, these technologies require a sizable initial investment, high operating costs, and generate secondary pollution, which restrict their commercial utilization.…”

Section: Introductionmentioning

confidence: 99%

“…Elimination of nitrogen oxides (NO x ) that are present in the flue gas is critical as NO x emissions raise significant environmental concerns such as acid rain, ozone depletion, and photochemical smog. − NO is the primary component of atmospheric NO x (∼90%); it is inert and has extremely low solubility in common solvents. Current industrial technologies for NO x reduction include selective catalytic reduction and selective noncatalytic reduction (SCR and SNCR, respectively). However, these technologies require a sizable initial investment, high operating costs, and generate secondary pollution, which restrict their commercial utilization. , Therefore, developing environmentally friendly, high-performing, and low-cost NO x sorbents for simple NO x removal systems is of paramount importance.…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Study on the Removal of NO₂ from Flue Gas Using Novel Ethylene Glycol-tetrabutylammonium Bromide Deep Eutectic Solvents

Dou

Zhao

et al. 2020

ACS Omega

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The removal of NO x (approximately 90% of which is NO) from flue gas is a crucial process for clean power generation from coal combustion. Oxidation of NO to NO 2 followed by NO 2 absorption using sorbents is considered to be a promising technology alternative to selective catalytic reduction (SCR). This study investigated the absorption of NO 2 in flue gas by ethylene glycol (EG)-tetrabutylammonium bromide (TBAB) deep eutectic solvents (DESs) under a range of experimental conditions. The effects of experimental conditions including molar ratio of EG to TBAB, operating temperature, residence time, and the O 2 and steam partial pressure in the flue gas on the denitrification performance of EG-TBAB DESs were systematically analyzed. The concentrations of NO 2 in the inlet and outlet were evaluated using a flue gas analyzer. The chemical structure changes of DESs after denitrification were characterized using Fourier transform infrared (FT-IR) spectroscopy. The obtained analysis signified that maximum denitrification efficiency and capacity were achieved at a EG/TBAB molar ratio of 5:1, 50 °C, and 6 s residence time. EG-TBAB DESs were able to maintain a stable denitrification performance after five absorption−desorption cycles. The results of quantum chemical calculation and 1 H NMR spectra of EG-TBAB DES show that bromide anions in the EG-TBAB DES maintained strong interactions with NO 2 via hydrogen bonding, leading to increased NO 2 adsorption. The presence of O 2 and steam in the flue gas improved the absorption of NO 2 in EG-TBAB DESs due to chemical reactions and formation of nitrate.

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“…As standards for the emission of industrial fumes become increasing stringent, more attention has focused on developing methods to degrade gaseous pollutants. Nitrogen oxides (NO x ) and particulate matter (PM) are major components of gaseous pollutants and account for environmental issues such as smog and acid rain. − Traditional treatment technologies employ catalysis reactors and filters to separately degrade NO x and intercept particulate matter, which results in high equipment and operation costs. − Catalytic membranes combine catalysis and separation in one unit and can simultaneously intercept particles and degrade NO x . , The support used for the catalytic membrane should be thermally and chemically stable at a high temperature. Porous silicon carbide (SiC) ceramic membranes exhibit superior PM rejection performance compared with other oxide ceramics such as Al 2 O 3 and ZrO 2 and have been recognized as excellent supports for catalytic membranes. ,, However, SiC membranes exhibit inertia in catalytic reactions, so the SiC membrane must be decorated with active catalytic components.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of a Pt/SAPO-34@SiC Catalytic Membrane for the Simultaneous Removal of NO and Particulate Matter

Pan

Wang

Ling

et al. 2020

Ind. Eng. Chem. Res.

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The collaborative removal of dust-containing toxic gas caused by emission of industrial fumes is an intractable problem, and catalytic membranes that combine catalysis and separation are an effective way to solve this problem. In this work, we exhibited the successful fabrication of a Pt/SAPO-34@SiC catalytic membrane and its excellent catalytic and filtration performance in the simultaneous removal of NO and particulate matter (PM). Only 25% of the gas permeation of the SiC membrane was sacrificed under the optimal synthesis condition, and monolayer growth of the SAPO-34 zeolites was achieved. The simultaneous removal of NO and PM tests showed that the highest NO oxidation rate and NO degradation rate were 72.5 and 92.3%, respectively, while the PM rejection rate was maintained at 99.99% during the whole test, corroborating the simultaneous removal of NO and dust tests. The prepared Pt/SAPO-34@SiC catalytic membrane exhibits great potential for exhaust purification.

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NO, NO2 and N2O emissions over a SCR using DOC and DPF systems with Pt reduction

Cited by 61 publications

References 33 publications

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

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

Mechanistic Study on the Removal of NO₂ from Flue Gas Using Novel Ethylene Glycol-tetrabutylammonium Bromide Deep Eutectic Solvents

Hydrothermal Synthesis of a Pt/SAPO-34@SiC Catalytic Membrane for the Simultaneous Removal of NO and Particulate Matter

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NO, NO2 and N2O emissions over a SCR using DOC and DPF systems with Pt reduction

Cited by 61 publications

References 33 publications

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

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

Mechanistic Study on the Removal of NO2 from Flue Gas Using Novel Ethylene Glycol-tetrabutylammonium Bromide Deep Eutectic Solvents

Hydrothermal Synthesis of a Pt/SAPO-34@SiC Catalytic Membrane for the Simultaneous Removal of NO and Particulate Matter

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Mechanistic Study on the Removal of NO₂ from Flue Gas Using Novel Ethylene Glycol-tetrabutylammonium Bromide Deep Eutectic Solvents