Selective catalytic reduction of NOx by diesel fuel: Plasma-assisted HC/SCR system

Cho, Byong K.; Lee, Jong‐Hwan; Crellin, Chris C.; Olson, Keith L.; Hilden, David L.; Kim, Mun Kyu; Kim, Pyung Soon; Heo, Iljeong; Oh, Se H.; Nam, In−Sik

doi:10.1016/j.cattod.2012.03.044

Cited by 31 publications

(14 citation statements)

References 15 publications

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“…The deNOx efficiency of the zeolite was improved by injecting 2.5% NH3 during the discharge stage. The properties observed for combined catalyst-plasma systems show some promise for the selective NOx reduction by hydrocarbons over Ag/Al2O3 catalysts since the activation or partial oxidation of the hydrocarbons has been shown to be a controlling step in the formation of N2 as a product [9,27,30]. Furthermore, the increased performance at low temperature of plasma assisted process compared with thermally activated processes may hold the solution to cold start emission control.…”

Section: Introductionmentioning

confidence: 99%

Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NO_x Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al₂O₃ Catalyst

Stere¹,

Adress²,

Burch³

et al. 2014

ACS Catal.

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Atmospheric pressure non-thermal plasma activated catalysis for the removal of NOx using hydrocarbon selective catalytic reduction has been studied utilising toluene and n-octane as the hydrocarbon reductant. When the plasma was combined with an Ag/Al2O3catalyst a strong enhancement in activity was observed when compared with conventional thermal activation with high conversions of both NOx and hydrocarbons obtained at temperature ≤250 C, where the silver catalyst is normally inactive. Importantly, in the absence of an external heat source, significant activity was obtained at 25 o C. This low temperature activity provides the basis for applying non thermal plasmas to activate emission control catalysts during cold start conditions which remains an important issue for mobile and stationary applications.

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Section: Introductionmentioning

confidence: 99%

Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NO_x Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al₂O₃ Catalyst

Stere¹,

Adress²,

Burch³

et al. 2014

ACS Catal.

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“…Li et al [259] explored the enhanced effect of Mn-Co-CeO x catalyst with plasma treatment in NH 3 -SCR. Cho et al [260] discussed the concerted effect in plasma-enhanced catalysis. Using Ba & Cu (C 2 H 2 O 3 ) 2 as catalyst, NO was oxidized to NO 2 in plasma, while hydrocarbon was oxidized to active intermediate species CO, which eventually reduced NO x to N 2 .…”

Section: Plasma Concerted Catalysismentioning

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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“…Dual-bed catalysts such as Ba/zeolite Y-Cu/zeolite Y and Ba/zeolite Y-Ag/Al2O3 were tested as SCR catalysts with the Ba/zeolite Y-Cu/zeolite Y catalysts, showing the best performances (~60% mode-averaged NOx conversion). This was attributed to the higher oxidation activity of the Cu catalysts compared to the Ag ones due to inhibition of the latter by heavy HCs present in the exhaust at temperatures < 300 °C [15].…”

Section: Hydrocarbon-selective Catalytic Reduction (Hc-scr) Using Ntpmentioning

confidence: 99%

Non-thermal-plasma-activated de-NO _x catalysis

Gholami

Stere

Goguet

et al. 2017

Phil. Trans. R. Soc. A.

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The combination of non-thermal plasma (NTP) with catalyst systems as an alternative technology to remove NO x emissions in the exhaust of lean-burn stationary and mobile sources is reviewed. Several factors, such as low exhaust gas temperatures (below 300°C), low selectivity to N 2 and the presence of impurities, make current thermally activated technologies inefficient. Various hybrid plasma–catalyst systems have been examined and shown to have a synergistic effect on de-NO x efficiency when compared with NTP or catalyst-alone systems. The NTP is believed to form oxygenated species, such as aldehydes and nitrogen-containing organic species, and to convert NO to NO 2 , which improves the reduction efficiency of N 2 during hydrocarbon-selective catalytic reduction reactions. The NTP has been used as a pretreatment to convert NO to its higher oxidation states such as NO 2 to improve NO x reduction efficiency in the subsequent processes, e.g. NH 3 -selective catalytic reduction. It has been applied to the lean phase of the NO x storage to improve the adsorption capacity of the catalyst by conversion of NO to NO 2 . Alternatively, a catalyst with high adsorption capacity is chosen and the NTP is applied to the rich phase to improve the reduction activity of the catalyst at low temperature. This article is part of a discussion meeting issue ‘Providing sustainable catalytic solutions for a rapidly changing world’.

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Selective catalytic reduction of NOx by diesel fuel: Plasma-assisted HC/SCR system

Cited by 31 publications

References 15 publications

Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NO_x Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al₂O₃ Catalyst

Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NO_x Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al₂O₃ Catalyst

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

Non-thermal-plasma-activated de-NO _x catalysis

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Selective catalytic reduction of NOx by diesel fuel: Plasma-assisted HC/SCR system

Cited by 31 publications

References 15 publications

Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NOx Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al2O3 Catalyst

Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NOx Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al2O3 Catalyst

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

Non-thermal-plasma-activated de-NO x catalysis

Contact Info

Product

Resources

About

Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NO_x Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al₂O₃ Catalyst

Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NO_x Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al₂O₃ Catalyst

Non-thermal-plasma-activated de-NO _x catalysis