Nitric oxide decomposition in air by using non-thermal plasma processing - with additives and catalyst

Oda, Takuji; Kato, T.; Takahashi, Tadashi; Shimizu, Kazuo

doi:10.1016/s0304-3886(97)00137-x

Cited by 45 publications

(17 citation statements)

References 5 publications

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“…Thus, after the runs under deaerated conditions, air was passed through the reactor at 7 kV for 20 sec to remove the above carbon deposits by oxidation. Figure 2 shows the dependence of decomposition efficiencies for CH 4 , CH 3 Cl, CH 3 Br and CH 2 Br 2 on specific energy density (SED), which is defined as a ratio of primary power to gas flow rate (see eq 1). At given SEDs, the three halogenated CH 4 derivatives show almost the same high reactivities, which are obviously higher than that of CH 4 .…”

Section: Plasma Chemical Decomposition Of Chmentioning

confidence: 99%

“…Figure 2 shows the dependence of decomposition efficiencies for CH 4 , CH 3 Cl, CH 3 Br and CH 2 Br 2 on specific energy density (SED), which is defined as a ratio of primary power to gas flow rate (see eq 1). At given SEDs, the three halogenated CH 4 derivatives show almost the same high reactivities, which are obviously higher than that of CH 4 . These findings can be rationalized by the different strengths of the weakest bonds in the congeners (see Table 1).…”

Section: Plasma Chemical Decomposition Of Chmentioning

confidence: 99%

“…Various nitriles such as dicyan (NC-CN), hydrogen cyanide (HCN), and bromine cyanide (BrCN) were detected, and their concentrations were unexpectedly high. In this research, only BrCN was quantified, because the standard samples 4 and/or the CH 3 radical. In situ concentrations of free Br are expected to be lower in humidified N 2 .…”

Section: Byproduct Formationmentioning

confidence: 99%

“…Nonthermal plasma chemical processing of hazardous air pollutants (HAPs) as an emerging technology has been extensively investigated in NO x removal, [2][3][4][5][6] decomposition of volatile organic compounds (VOCs), [7][8][9][10][11][12][13][14][15] and indoor air cleaning. 16 Compared to other technologies such as adsorption, catalytic oxidation, and incineration, nonthermal plasma chemical processing is advantageous in achieving high decomposition efficiencies of dilute HAPs at short residence time and ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

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Nonthermal Plasma Chemical Processing of Bromomethane

Zhang

Futamura

Yamamoto

1999

Journal of the Air & Waste Management Association

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Nonthermal plasma chemical decomposition of bromomethane (CH 3 Br) was investigated with a coaxial type packed-bed plasma reactor. It has been demonstrated that plasma chemical processing is an effective approach to decompose CH 3 Br in a wide concentration range. It has been shown that CH 3 Br decomposition reactivity depends on reactor operating factors such as background gas, O 2 concentration, and humidification. Higher decomposition efficiencies can be obtained in dry N 2 . However, organic byproducts such as BrCN are concurrently produced under deaerated conditions. Water suppresses CH 3 Br decomposition and also affects the yields of CO x (CO and CO 2 ) and organic byproducts due to the involvement of some active species generated from water. The presence of O 2 retards CH 3 Br decomposition by quenching highenergy electrons, while it suppresses organic byproducts and improves CO x yield. The reacted carbons in CH 3 Br are recovered as CO x almost quantitatively in air. Higher CO 2 selectivities cannot be achieved by increasing O 2 concentration. NO x formation, which is accompanied by IMPLICATIONS Bromomethane (CH 3 Br) is commonly used as an excellent fumigant on fields and in quarantine facilities, but it threatens to cause stratospheric ozone depletion (ODP CH 3 Br = 0.74). It has been decided that the use of CH 3 Br will be continued as an essential use in quarantine facilities even after 2004, because no alternative compounds have yet been found due to its high sterilizing power and advantageous properties (i.e., a colorless and odorless gas). Up to 5000 parts per million of CH 3 Br is emitted from silo roofs in these facilities without any treatment, and its total consumption amounted to 2370 tons per year in Japan in 1995. In these facilities, nonthermal plasma chemical decomposition is considered to be a potential candidate to solve the problem. This paper summarizes the results from a laboratory-scale evaluation of CH 3 Br reactivity in nonthermal plasma and the effects of reaction parameters affecting byproduct distributions.CH 3 Br decomposition, can be effectively suppressed by decreasing O 2 concentration down to 2%. Furthermore, reaction mechanisms are discussed by comparing the reactivities of CH 3 Br and its congeners.

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Section: Plasma Chemical Decomposition Of Chmentioning

confidence: 99%

Section: Plasma Chemical Decomposition Of Chmentioning

confidence: 99%

Section: Byproduct Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonthermal Plasma Chemical Processing of Bromomethane

Zhang

Futamura

Yamamoto

1999

Journal of the Air & Waste Management Association

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“…So the low temperature plasma technology combined with the catalytic technology can be complementary advantages and further improve the denitration efficiency. 9,10 Denitration research at home and abroad are either confined to the traditional methods such as catalytic reduction, catalytic oxidation, or confined to new methods, plasma denitration, for example. There are few reports that can undertake a comprehensive study of the combination.…”

Section: Introductionmentioning

confidence: 99%

Synergistic catalytic removal NOX and the mechanism of plasma and hydrocarbon gas

Zhang

Xiangling

et al. 2016

AIP Advances

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This paper using a method of catalytic adsorption combined with dielectric barrier discharge plasma which added to hydrocarbon gases. The different background gases, different dielectric properties and different pore sizes of the hydrolysis coke on the denitrification performance was studied. The effect of the coaction of plasma and the different properties of the removal of NO in flue gas was investigated, and the catalytic mechanism of the synergistic effect of plasma and hydrocarbon gas was discussed. The results shown that: The denitrification rate was significantly affected by plasma power and the initial concentration of NO; the reaction was restrained by the presence of oxygen and greatly promoted by the hydrocarbon gases. The permittivity of the catalyst has a great influence on the activity and the porous structure of the catalyst can obviously promote the reaction when the low temperature plasma combined with hydrocarbon gases.

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References

2012

Atmospheric Pressure Plasma for Surface Modification

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Nitric oxide decomposition in air by using non-thermal plasma processing - with additives and catalyst

Cited by 45 publications

References 5 publications

Nonthermal Plasma Chemical Processing of Bromomethane

Nonthermal Plasma Chemical Processing of Bromomethane

Synergistic catalytic removal NOX and the mechanism of plasma and hydrocarbon gas

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