Conversion of NO to NO2 in air by a pulsed corona discharge process

Mok, Young Sun; Ham, Sung Won

doi:10.1016/s0009-2509(97)00441-7

Cited by 70 publications

(53 citation statements)

References 24 publications

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“…21 In CMD, the high-energy electrons can have energies ranging from 5 to 10 eV. 20 The high-energy electrons lose energy through collisions with gas molecules, which leads to the formation of a variety of species, including ions, metastable species, atoms, and free radicals. These products are chemically active and react easily with other gas molecules to form stable compounds.…”

Section: Removal Of No By Cmd (Without Ch 4 )mentioning

confidence: 99%

Direct Decomposition of NO Activated by Microwave Discharge

Tang

Zhang

et al. 2003

Ind. Eng. Chem. Res.

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The environmentally friendly removal of NO has been investigated using continuous microwave discharge (CMD) at atmospheric pressure. In these experiments, conversions of NO to N 2 as well as NO 2 were mainly observed for both dry and wet feed gas, which showed a great difference from those observed with other discharge methods. The effects of a series of reaction parameters, including microwave input power, O 2 concentration, NO concentration, and gas flow rate, on the product distribution and energy efficiency were also studied. Under all reaction conditions, the conversions of NO to N 2 were higher than those to NO 2 . The highest conversion of NO to N 2 was 88%. The reaction rate of NO removal and the effects of the different discharge modes on NO conversion and product distribution are also discussed. Through comparison of the results of different discharge modes, it was found that the addition of CH 4 apparently increased the conversion of NO to N 2 as well as the energy efficiency. A possible reaction process is suggested.

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Section: Removal Of No By Cmd (Without Ch 4 )mentioning

confidence: 99%

Direct Decomposition of NO Activated by Microwave Discharge

Tang

Zhang

et al. 2003

Ind. Eng. Chem. Res.

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“…The phenol decomposition rate at 60 min is greatest (56%) in pure O 2 , it has the second highest value (42%) in pure N 2 , and lesser values (under 40%) are obtained in other N 2 -O 2 mixtures. When N 2 -O 2 is used as the background gas, the following reactions can be induced in a pulsed discharge plasma [5,[7][8][9][10]12]:…”

Section: Influence Of Charging Voltage and Number Of Needle Electrodementioning

confidence: 99%

Pulsed discharge purification of water containing nondegradable hazardous substances

Miyazaki

Satoh

2010

Electrical Engineering Japan

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SUMMARYWe investigate the decomposition characteristics of phenol in an aqueous solution under exposure to pulsed discharge plasma. The investigation is carried out with different electrode configurations, applied voltages, and humidity levels and compositions of the background gas. It is possible that in the case of all gases, OH radicals are responsible for the decomposition of phenol in the solution. In pure O 2 , the decomposition rate of phenol increases due to the generation of O and O 3 . In pure N 2 , OH radicals produced by N 2 , which is excited in the metastable state, contribute to phenol decomposition. In N 2 -O 2 , the decomposition rate of phenol remains low, and the NO x produced by the pulsed plasma in a N 2 -O 2 mixture destroys O 3 , and the production of the NO x inhibits O 3 production. In Ar-O 2 , the decomposition rate of phenol increases with an increase in the concentration of Ar in the mixture. It is possible that excited Ar atoms are responsible for the decomposition of phenol in the solution at higher concentrations of Ar in Ar-O 2 . Further, it is found that the decomposition rate of phenol in aqueous solution exposed to a pulsed discharge is almost the same as that of phenol in aqueous solution exposed to a DC corona discharge.

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“…However, most of these models focus on NO x oxidation by oxidizing radicals, and very few reports concern the reduction of NO x with reducing radicals. 22,23 This study investigated the NO conversion behaviors in a PCDP reactor with different additives, including N 2 H 4 ·H 2 O, ammonia and moisture. The key elementary reactions and radicals were identified via a sensitivity analysis along with radical generation and disappearance as well as De-NO x mechanism models.…”

Section: Introductionmentioning

confidence: 99%

Hydrazine-enhanced NO conversion in a pulsed corona discharge plasma (PCDP) reactor: Behaviors and mechanism

et al. 2016

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The NO conversion efficiency in a pulsed corona discharge plasma (PCDP) reactor in the presence of a new additive, hydrazine hydrate (N2H4·H2O), was studied, and the reaction mechanism was analyzed. The NO conversion efficiency reached 62.5%, and the NO conversion Energy Yield (EY) reached 20.9 gNO/kWh, which is higher than that obtained using water or ammonia additives under the same conditions. The predominant elementary reactions and radicals, as well as the mechanism by which the additive enhanced the NO conversion process, were determined by comparing experimental data with theoretical simulation results and by performing a sensitivity analysis. After the addition of N2H4·H2O, the N2H4 reacts with radicals generated in the PCDP reactor to form a large quantity of strongly reducing species with NH2 as the predominant component, which can directly reduce NO to N2 and effectively prevent the generation of N2O. Compared with the traditional PCDP-based De-NOx process in which nitric acid is generated by oxidation with an additional neutralization step required, this new PCDP-based De-NOx process with N2H4·H2O addition is superior because NO is mostly reduced to N2. The study provides a basis for the application of N2H4·H2O as a synergist to improve NO abatement in a PCDP reactor.

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Conversion of NO to NO2 in air by a pulsed corona discharge process

Cited by 70 publications

References 24 publications

Direct Decomposition of NO Activated by Microwave Discharge

Direct Decomposition of NO Activated by Microwave Discharge

Pulsed discharge purification of water containing nondegradable hazardous substances

Hydrazine-enhanced NO conversion in a pulsed corona discharge plasma (PCDP) reactor: Behaviors and mechanism

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