Combined plasma-catalytic processing of nitrous oxide

Krawczyk, Krzysztof; Młotek, Michał

doi:10.1016/s0926-3373(00)00243-5

Cited by 61 publications

(33 citation statements)

References 12 publications

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“…The results show that the increase in the frequency led to the decrease in the reactant conversions and product yields, which is in contrast to the effect of applied voltage. Sreethawong et al [18] also reported that both the CH 4 and O 2 conversions decreased as the frequency increased in the investigation of the partial oxidation of methane using the multistage gliding arc discharge system. The conversions for all reactants were in the following order: C 3 H 8 [ C 2 H 6 [ CH 4 [ CO 2 , resulting from their bond dissociation energies, which are 4.33, 4.35, 4.55, and 5.52 eV, respectively, as mentioned in our previous work [28].…”

Section: Effect Of Input Frequencymentioning

confidence: 97%

“…A gliding arc is a new discharge type of non-thermal plasma that successfully provides the most effective non-equilibrium characteristics with simultaneous high productivity and good selectivity [2]. In general, the gliding arc discharge was first designed and developed for use mostly in pollution control [3][4][5][6][7][8] and surface treatment [9][10][11]. In recent years, this plasma reactor type has received increasing interest in utilization for fuel conversion [12][13][14][15][16][17][18] and in applications for carbon black production [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Reforming of CO2-Containing Natural Gas Using an AC Gliding Arc System: Effects of Operational Parameters and Oxygen Addition in Feed

Rueangjitt

Sreethawong

Chavadej

2008

Plasma Chem Plasma Process

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In this research, the reforming of simulated natural gas containing a high CO 2 content under AC non-thermal gliding arc discharge with partial oxidation was conducted at ambient temperature and atmospheric pressure, with specific regards to the concept of the direct utilization of natural gas. This work aimed at investigating the effects of applied voltage and input frequency, as well as the effect of adding oxygen on the reaction performance and discharge stability in the reforming of the simulated natural gas having a CH 4 :C 2 H 6 :C 3 H 8 :CO 2 molar ratio of 70:5:5:20. The results showed marked increases in both CH 4 conversion and product yield with increasing applied voltage and decreasing input frequency. The selectivities for H 2 , C 2 H 6 , C 2 H 4 , C 4 H 10 , and CO were observed to be enhanced at a higher applied voltage and at a lower frequency, whereas the selectivity for C 2 H 2 showed an opposite trend. The use of oxygen was found to provide a great enhancement of the plasma reforming of the simulated natural gas. For the combined plasma and partial oxidation in the reforming of CO 2 -containing natural gas, air was found to be superior to pure oxygen in terms of reactant conversions, product selectivities, and specific energy consumption. The optimum conditions were found to be a hydrocarbons-tooxygen feed molar ratio of 2/1 using air as an oxygen source, an applied voltage of 17.5 kV, and a frequency of 300 Hz, in providing the highest CH 4 conversion and synthesis gas selectivity, as well as extremely low specific energy consumption. The energy consumption was as low as 2.73 9 10 -18 W s (17.02 eV) per molecule of converted reactant and 2.49 9 10 -18 W s (16.60 eV) per molecule of produced hydrogen.

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Section: Effect Of Input Frequencymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Reforming of CO2-Containing Natural Gas Using an AC Gliding Arc System: Effects of Operational Parameters and Oxygen Addition in Feed

Rueangjitt

Sreethawong

Chavadej

2008

Plasma Chem Plasma Process

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“…In particular, non-thermal plasma has attracted much attention as an method for VOCs control for two decades due to its unique properties such as quick response at ambient temperature, achievement of high electron energies within short residence times, system compactness, and easy operations (Muhamad, 2000;Li et al, 2006). In order to improve the energy efficiency of the VOCs decomposition process by the plasma, the cooperation with catalyst has been tested by some researchers (Einaga et al, 2001;Guo et al, 2006;Jim, 2008;Krawczyk, 2001;Magureanu et al, 2007a and b;Ogata et al, 2003;Wallis et al, 2007;Li et al, 2007;Zhu et al, 2007b). These studies showed that the combination of discharge plasma with catalyst is a very effective method in VOCs removal.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of benzene by non-thermal plasma processing: Photocatalyst and ozone effect

Zhu

Jin

et al. 2008

Int. J. Environ. Sci. Technol.

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Plasma technology has some shortcomings, such as higher energy consumption and byproducts produced in the reaction process. However non-thermal plasma associated with catalyst can resolve these problems. Therefore this kind of technology was paied more and more attention to treat waste gas. A hybrid system comprising a non-thermal plasma reactor and nanometer titanium dioxide catalyst was used for benzene removal in the air. The paper described the synergistic effect of ozone and photocatalyst in the plasma reactor. Except of electric field strength, humidity and flow velocity, the synergistic behavior of ozone and photocatalyst was tested. The removal efficiency of benzene reaches nearly 99% when benzene concentration is 600 mg/m 3 , and the removal efficiency of benzene also reaches above 90% when benzene concentration is 1500 mg/m 3 . The plasma reactor packed with photocatalyst shows a better selectivity of carbon dioxide than that without photocatalyst. The final products is mostly carbon dioxide, water and a small quantity of carbon monoxide.

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“…In particular, depending on the physical characteristics of the plasma produced by different ionization systems, three types of processes can be classified: (1) destruction of toxic/harmful materials; (2) modification of existing materials, e.g., surface treatment for catalyst; (3) creation of new materials (Bonizzoni and Vassallo 2002). For the first point, many researches have been conducted by decomposing many industrial emissions, such as H 2 S (Dalaine et al 1998), N 2 O (Krawczyk and Mlotek 2001), CHCl 3 and CCl 4 Ulejczyk 2003, 2004). High percentage of destruction efficiency have been claimed using plasma.…”

Section: Plasma In Generalmentioning

confidence: 99%

Decomposition of greenhouse gases by plasma

et al. 2008

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The topic of decomposition and reduction of greenhouse gases is becoming an important issue in tackling the global warming effect since several years ago. Several technologies, including plasma-utilized process, were proposed to improve the treatment ability for the destruction of green house gases usually emitted by industrial activities. In this review paper, the application of plasma to reduce the emission of greenhouse gases was briefly summarized.

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Combined plasma-catalytic processing of nitrous oxide

Cited by 61 publications

References 12 publications

Reforming of CO2-Containing Natural Gas Using an AC Gliding Arc System: Effects of Operational Parameters and Oxygen Addition in Feed

Reforming of CO2-Containing Natural Gas Using an AC Gliding Arc System: Effects of Operational Parameters and Oxygen Addition in Feed

Decomposition of benzene by non-thermal plasma processing: Photocatalyst and ozone effect

Decomposition of greenhouse gases by plasma

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