Combination of low and high temperature catalytic materials to obtain broad temperature coverage for plasma-facilitated NOx reduction

Rappé, Kenneth G.; Hoard, John; Aardahl, Christopher L.; Park, P.W.; Peden, Charles H. F.; Tran, Diana

doi:10.1016/j.cattod.2003.11.020

Cited by 38 publications

(27 citation statements)

References 35 publications

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“…At lower reaction temperatures (<500 K), the efficiency of selective catalytic reduction (SCR) of NO x strongly depends on initial NO 2 concentration in the gas stream. About 30-50% of NO 2 in the gas stream greatly enhances the performance of SCR in DeNO x processes [6,62,63]. However, in real conditions the fraction of NO 2 present in the total NO x seldom exceeds 5%.…”

Section: Reduction Of Nitrogen Oxidesmentioning

confidence: 99%

“…It was proven that the addition of alkali and alkaline earth species (for zeolites) or transition metal ions (for g-alumina) enhances catalytic activity [62]. In recent publications both designs, in-plasma catalysis [65,56] and downstream catalysis [6,47,62,64,56], have been examined for NO x reduction purposes. Niu et al [66] reported that NO x conversion by a catalyst-filled dielectric barrier discharge with methane additive was much higher than with plasma alone.…”

Section: Reduction Of Nitrogen Oxidesmentioning

confidence: 99%

“…Basically (plasma generated) ozone, hydroxyl radicals and atomic oxygen play an important role in the oxidation of NO to NO 2 . When hydrocarbons are simultaneously treated by the plasma discharge, partially oxidized hydrocarbons and peroxy radicals (RO 2 ) are generated which react with NO and strongly influence NO 2 formation rates [6,62]. After the pretreatment step, NO 2 reacts over a catalyst while partially oxidized hydrocarbons are consumed during selective catalytic reduction producing CO 2 , N 2 and H 2 O [48].…”

Section: Reduction Of Nitrogen Oxidesmentioning

confidence: 99%

“…For these kinds of applications, plasma-facilitated catalysis is most a two-step process which consists of a plasma pretreatment of the exhaust before flow over a lean NO x catalyst [6,62]. At lower reaction temperatures (<500 K), the efficiency of selective catalytic reduction (SCR) of NO x strongly depends on initial NO 2 concentration in the gas stream.…”

Section: Reduction Of Nitrogen Oxidesmentioning

confidence: 99%

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Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

Durme¹,

Dewulf²,

Leys³

et al. 2008

Applied Catalysis B: Environmental

676

379

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Plasma driven catalysis is a promising technology for waste gas treatment characterized by higher energy efficiencies, high mineralization rates and low by-product formation. The combination of heterogeneous catalysts with non-thermal plasma can be operated in two configurations: positioning the catalyst in the discharge zone (in-plasma catalysis) or downflow the discharge zone (post plasma catalysis).In a first part of the review, changes of plasma properties resulting from the introduction of catalyst material are discussed. It has been reported that discharge types can even change. Accordingly, it was reported that microdischarges are formed within the catalyst pores. Changing plasma characteristics can eventually result in enhanced production of new active species, increasing the oxidizing power of the plasma discharge.In a second part, it is discussed that plasma discharges also affect catalyst properties such as a change in chemical composition, enhancement in surface area or change of catalytic structure. These phenomena partially explain why catalyst adsorption kinetics of airborne pollutants are affected when exposed to plasma discharges.It is also reviewed that the synergy of combining plasma with catalysts can not only be attributed to the production of new reactive species. Also plasma photon emission or thermal hot-spots can initiate catalytic pollutant oxidation reactions.To conclude, an overview of recently published manuscripts concerning plasma catalysis for volatile organic compounds abatement is given. It is also discussed why heterogeneous plasma catalysis has high potential for the simultaneous abatement of NO x and hydrocarbons. #

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Section: Reduction Of Nitrogen Oxidesmentioning

confidence: 99%

Section: Reduction Of Nitrogen Oxidesmentioning

confidence: 99%

Section: Reduction Of Nitrogen Oxidesmentioning

confidence: 99%

Section: Reduction Of Nitrogen Oxidesmentioning

confidence: 99%

See 2 more Smart Citations

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

Durme¹,

Dewulf²,

Leys³

et al. 2008

Applied Catalysis B: Environmental

676

379

View full text Add to dashboard Cite

show abstract

“…Combining low and high temperature-active catalytic materials has been shown to enhance the temperature range during post plasma-SCR of NOx [14]. Ba/zeolite Y and Ag/Ɣ-Al2O3 catalysts were combined in different configurations e.g.…”

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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Super Clean Marine Diesel Engines with Nonthermal Plasma Aftertreatment Technology

Kuwahara

Okubo

2016

Lecture Notes in Energy

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Combination of low and high temperature catalytic materials to obtain broad temperature coverage for plasma-facilitated NOx reduction

Cited by 38 publications

References 35 publications

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

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

Super Clean Marine Diesel Engines with Nonthermal Plasma Aftertreatment Technology

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Combination of low and high temperature catalytic materials to obtain broad temperature coverage for plasma-facilitated NOx reduction

Cited by 38 publications

References 35 publications

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

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

Super Clean Marine Diesel Engines with Nonthermal Plasma Aftertreatment Technology

Contact Info

Product

Resources

About

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