Removal of Nitric Oxide in a Pulsed Corona Discharge Reactor

Mok, Young Sun; Nam, In−Sik

doi:10.1002/(sici)1521-4125(199906)22:6<527::aid-ceat527>3.0.co;2-5

Cited by 27 publications

(15 citation statements)

References 18 publications

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“…At ambient temperature, O 3 was proved to play an important role in the oxidation of NO (via R9). (25) However, as we can see from the rates of R10 and R11 (listed in Table I), formation of O 3 decreases a lot with the increase in temperature and, moreover, the decomposition of O 3 to O 2 becomes significant as the temperature increases. Consequently, at 523 K, the dominant reaction for NO oxidation to NO 2 is R6.…”

Section: No/o 2 /N 2 Systemmentioning

confidence: 99%

Conversion of NO in NO/N2, NO/O2/N2, NO/C2H4/N2 and NO/C2H4/O2/N2 Systems by Dielectric Barrier Discharge Plasmas

Zhu

Sun

Niu

et al. 2005

Plasma Chem Plasma Process

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An experimental study on the conversion of NO in the NO/N 2 , NO/O 2 /N 2 , NO/C 2 H 4 /N 2 and NO/C 2 H 4 /O 2 /N 2 systems has been carried out using dielectric barrier discharge (DBD) plasmas at atmospheric pressure. In the NO/N 2 system, NO decomposition to N 2 and O 2 is the dominating reaction; NO conversion to NO 2 is less significant. O 2 produced from NO decomposition was detected by an on-line mass spectrometer. With the increase of NO initial concentration, the concentration of O 2 produced decreases at 298 K, but slightly increases at 523 K. In the NO/O 2 /N 2 system, NO is mainly oxidized to NO 2 , but NO conversion becomes very low at 523 K and over 1.6% of O 2 . In the NO/C 2 H 4 /N 2 system, NO is reduced to N 2 with about the same NO conversion as that in the NO/N 2 system but without NO 2 formation. In the NO/C 2 H 4 /O 2 /N 2 system, the oxidation of NO to NO 2 is dramatically promoted. At 523 K, with the increase of the energy density, NO conversion increases rapidly first, and then almost stabilizes at 93-91% of NO conversion with 61-55% of NO 2 selectivity in the energy density range of 317-550 J L −1 . It finally decreases gradually at high energy density. A negligible amount of N 2 O is formed in the above four systems. Of the four systems studied, NO conversion and NO 2 selectivity of the NO/C 2 H 4 /O 2 /N 2 system are the highest, and NO/O 2 /C 2 H 4 /N 2 system has the lowest electrical energy consumption per NO molecule converted.

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Section: No/o 2 /N 2 Systemmentioning

confidence: 99%

Conversion of NO in NO/N2, NO/O2/N2, NO/C2H4/N2 and NO/C2H4/O2/N2 Systems by Dielectric Barrier Discharge Plasmas

Zhu

Sun

Niu

et al. 2005

Plasma Chem Plasma Process

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“…6 shows the concentration profiles of NO as a function of energy density at different temperatures. In a gas mixture of the present case, the NO removal takes place mainly by its oxidation to NO [7], [8], [26]. At room temperature, NO was easily depleted.…”

Section: Resultsmentioning

confidence: 68%

Abatement of nitrogen oxides in a catalytic reactor enhanced by nonthermal plasma discharge

Mok

Ravi

Kang

et al. 2003

IEEE Trans. Plasma Sci.

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Removal of nitrogen oxides using a nonthermal plasma process (dielectric barrier discharge) combined with catalyst was investigated. In this system, selective catalytic reduction of nitrogen oxides is affected by the operating condition of the plasma process and, thus, the characteristics of the plasma process were separately examined before combining the two processes. The oxidation of NO to NO 2 in the plasma reactor easily took place at room temperature. As the temperature increased, however, the rate of the oxidation greatly decreased, which implies that an additive to increase the reaction rate is necessary. In the presence of ethylene as an additive, the oxidation of NO to NO 2 largely enhanced at a temperature range of 100 C-200 C. Comparison of ac with pulse voltage in terms of the energy efficiency for NO oxidation was made, and almost no difference between the two voltage types was observed. The removal of NO on the catalyst (V 2 O 5 /TiO 2) was found to largely increase by the plasma discharge. The byproduct formaldehyde formed from ethylene in the plasma reactor could be completely removed in the catalytic reactor while significant amount of carbon monoxide and ammonia slip were observed. The plasma-catalyst system used in this study was able to remove more than 80% of NO (energy yield: 42 eV/NO-molecule) at a temperature range of 100 C-200 C that is much lower than typical temperature window of selective catalytic reduction (250 C-450 C).

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“…일반적인 IPA 제거방법으로 습식 스크러버(scrubber)와 열산화 방 법이 알려져 있으나 [7], 흡수법은 단순히 오염물질을 기상에서 액상으 로 전달하므로 2차적인 수질오염 문제를 야기하고, 750 ℃ 이상의 고 온을 필요로 하는 열산화 방법은 높은 연료비용과 특수한 내열 소재 를 사용해야 하는 문제점이 있다 [3]. 그밖에 촉매 혹은 광촉매 공정, 저온 플라즈마 공정 및 플라즈마-촉매 하이브리드 시스템 등이 연구 되고 있다 [7][8][9][10][11]. 촉매산화 공정은 비교적 낮은 온도에서 VOCs를 산 화시킬 수 있어 열산화 공정에 비해 적은 운전비용으로 유해가스를 처리할 수 있다 [12].…”

Section: 및 세정제로 널리 사용되고 있는 물질이다 특히 디스크헤드와 레이 저의 렌즈 광학 디스크 드라이브 및 액정unclassified

Oxidation of Isopropyl Alcohol in Air by a Catalytic Plasma Reactor System

Jo¹,

Mok²

2014

Applied Chemistry for Engineering

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A catalytic plasma reactor was employed for the oxidation of isopropyl alcohol (IPA) classified as a volatile organic compound (VOC). Copper oxide (Cu : 0.5% (w/w)) supported on a multichannel porous ceramic consisting of α-Al2O3 was used as a catalyst, which was directly exposed to the plasma created in it. The effects of discharge voltage and reaction temperature on the concentrations of IPA and its byproducts were examined to understand the behavior of the catalytic plasma reactor. Without thermal insulation, the reactor temperature increased up to 120 ℃ at an applied voltage of 17 kV (discharge power : 28 W), and the IPA at a flow rate of 1 L min -1 (O2 : 10% (v/v); IPA : 1000 ppm) was completely removed. At temperatures below 120 ℃, however, besides the desirable product CO2, several unwanted byproducts such as acetone, formaldehyde and CO were also formed from IPA. On the other hand, when the reactor was thermally insulated, the plasma discharge increased the temperature up to 265 ℃ under the same condition and most of IPA was oxidized to CO2. Without loading CuO on the ceramic support, the plasma discharge in the thermally insulated reactor produced nearly equal amounts of CO2 and CO. On comparison, with the catalyst alone (temperature : 265 ℃), more than 70% of the removed IPA was simply converted into another type of VOC (acetone), indicating that the catalyst assisted by the plasma is more effective in the oxidation of IPA than that of the catalyst-alone process. Keywords

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Removal of Nitric Oxide in a Pulsed Corona Discharge Reactor

Cited by 27 publications

References 18 publications

Conversion of NO in NO/N2, NO/O2/N2, NO/C2H4/N2 and NO/C2H4/O2/N2 Systems by Dielectric Barrier Discharge Plasmas

Conversion of NO in NO/N2, NO/O2/N2, NO/C2H4/N2 and NO/C2H4/O2/N2 Systems by Dielectric Barrier Discharge Plasmas

Abatement of nitrogen oxides in a catalytic reactor enhanced by nonthermal plasma discharge

Oxidation of Isopropyl Alcohol in Air by a Catalytic Plasma Reactor System

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