scholarly journals Effect of Coexistent Hydrogen on the Selective Production of Ethane by Dehydrogenative Methane Coupling through Dielectric-Barrier Discharge under Ordinary Pressure at an Ambient Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Katsuya Konno ◽  
Kaoru Onoe ◽  
Yasuyuki Takiguchi ◽  
Tatsuaki Yamaguchi
Keyword(s):  
Ambient Temperature ◽  
Dielectric Barrier Discharge ◽  
Methane Conversion ◽  
Barrier Discharge ◽  
Product Selectivity ◽  
Methane Coupling ◽  
Dielectric Barrier ◽  
External Heating ◽  
Dbd Reactor ◽  
Alkene Production

The effect of coexistence of hydrogen on the product selectivity to ethane from methane by dielectric-barrier discharge (DBD) reactor was examined experimentally under ordinary pressure without use of catalyst and external heating. By the dilution of methane with hydrogen, both the increase of methane conversion and the decrease of alkene production were observed, improving the selectivities to ethane by ca. 70%.

Duty Factor Effect on Ozone Production Using Dielectric Barrier Discharge Reactor Driven by IGBT Pulse Modulator

2007 ◽  
Vol 10 (2) ◽  
Author(s):  
T. Miura ◽  
T. Sato ◽  
K. Arima ◽  
S. Mukaigawa ◽  
K. Takaki ◽  
...  
Keyword(s):  
Dielectric Barrier Discharge ◽  
Applied Voltage ◽  
Barrier Discharge ◽  
Pulse Voltage ◽  
Ozone Production ◽  
Duty Factor ◽  
Pure Oxygen ◽  
Dielectric Barrier ◽  
Pulse Modulator ◽  
Dbd Reactor

AbstractAn ozone production using pulse voltage driven dielectric barrier discharge (DBD) reactor was investigated experimentally to clarify an influence of a duty factor of applied pulse voltage on ozone yield. A square of 10 kV applied voltage was generated using a pulse modulator. Insulated gate bipolar transistor (IGBT) switches were employed to generate the square pulse with 1 kHz in pulse repetition rate. Duty factor of the pulse voltage was controlled in range from 10 to 80% by timing of a gate signal to the IGBT switches. The output voltages of the power supply were applied to a multipoint electrode type DBD reactor in order to operate at low applied voltage. The ozone yield was obtained to be around 100 g/kWh at several thousands ppm ozone production in pure oxygen circumstance at 5 L/min. gas flow. The ozone yield decreased with increasing ozone concentration and was almost independent of the duty factor of square applied voltage under the present experimental condition. Power loss consumed in the pulse modulator was successfully reduced by decreasing duty factor of the output voltage without decrease of the ozone production.

scholarly journals Abatement of Toluene by Reverse-Flow Nonthermal Plasma Reactor Coupled with Catalyst

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 511 ◽  
Author(s):  
Wenjun Liang ◽  
Huipin Sun ◽  
Xiujuan Shi ◽  
Yuxue Zhu
Keyword(s):  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Reverse Flow ◽  
Plasma Reactor ◽  
Nonthermal Plasma ◽  
Toluene Degradation ◽  
Dielectric Barrier ◽  
Reactor Temperature ◽  
Dbd Reactor ◽  
By Products

In order to make full use of the heat in nonthermal plasma systems and decrease the generation of by-products, a reverse-flow nonthermal plasma reactor coupled with catalyst was used for the abatement of toluene. In this study, the toluene degradation performance of different reactors was compared under the same conditions. The mechanism of toluene abatement by nonthermal plasma coupled with catalyst was explored, combined with the generation of ozone (O3), NO2, and organic by-products during the reaction process. It was found that a long reverse cycle time of the reactor and a short residence time of toluene decreased the internal reactor temperature, which was not beneficial for the degradation of toluene. Compared with the dielectric barrier discharge (DBD) reactor, toluene degradation efficiency in the double dielectric barrier discharge (DDBD) reactor was improved at the same discharge energy level, but the concentrations of NO2 and O3 in the effluent were relatively high; this was improved after the introduction of a catalyst. In the reverse-flow nonthermal plasma reactor coupled with catalyst, the CO2 selectivity was the highest, while the selectivity and amount of NO2 was the lowest and aromatics, acids, and ketones were the main gaseous organic by-products in the effluent. The reverse-flow DBD-catalyst reactor was successful in decreasing organic by-products, while the types of organic by-products in the DDBD reactor were much more than those in the DBD reactor.

scholarly journals Altering Conversion and Product Selectivity of Dry Reforming of Methane in a Dielectric Barrier Discharge by Changing the Dielectric Packing Material

Catalysts ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 51 ◽  
Author(s):  
Inne Michielsen ◽  
Yannick Uytdenhouwen ◽  
Annemie Bogaerts ◽  
Vera Meynen
Keyword(s):  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Dry Reforming ◽  
Packing Material ◽  
Dry Reforming Of Methane ◽  
Product Selectivity ◽  
Total Conversion ◽  
Packing Materials ◽  
Dielectric Barrier ◽  
Α Al2o3

We studied the influence of dense, spherical packing materials, with different chemical compositions, on the dry reforming of methane (DRM) in a dielectric barrier discharge (DBD) reactor. Although not catalytically activated, a vast effect on the conversion and product selectivity could already be observed, an influence which is often neglected when catalytically activated plasma packing materials are being studied. The α-Al2O3 packing material of 2.0–2.24 mm size yields the highest total conversion (28%), as well as CO2 (23%) and CH4 (33%) conversion and a high product fraction towards CO (~70%) and ethane (~14%), together with an enhanced CO/H2 ratio of 9 in a 4.5 mm gap DBD at 60 W and 23 kHz. γ-Al2O3 is only slightly less active in total conversion (22%) but is even more selective in products formed than α-Al2O3. BaTiO3 produces substantially more oxygenated products than the other packing materials but is the least selective in product fractions and has a clear negative impact on CO2 conversion upon addition of CH4. Interestingly, when comparing to pure CO2 splitting and when evaluating differences in products formed, significantly different trends are obtained for the packing materials, indicating a complex impact of the presence of CH4 and the specific nature of the packing materials on the DRM process.

Kinetics, Products and Mechanism of Destruction of Ethane in Corona Discharge

2003 ◽  
Vol 6 (1) ◽  
Author(s):  
Anatoli A. Chernov ◽  
Larisa G. Krishtopa ◽  
Oleg P. Korobeinichev ◽  
Lev N. Krasnoperov
Keyword(s):  
Ambient Temperature ◽  
Corona Discharge ◽  
Dielectric Barrier Discharge ◽  
Mass Spectrometer ◽  
High Voltage ◽  
Barrier Discharge ◽  
Flow Reactor ◽  
Quadrupole Mass Spectrometer ◽  
Quadrupole Mass ◽  
Dielectric Barrier

AbstractDestruction of ethane in corona discharge was studied using a tubular coaxial wire AC high-voltage dielectric barrier discharge flow reactor coupled to a GC/MS and a quadrupole mass-spectrometer. The experi­ments were performed at ambient temperature (295 ± 3 K) and pressure (1.00 ± 0.04 bar). Mixtures of 12, 109, 1033 and 10000 ppm ethane in synthetic air (21% O

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