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Dong-wha Park - One of the best experts on this subject based on the ideXlab platform.

  • High-Efficient Conversion of CO_2 in AC-Pulsed Tornado Gliding Arc Plasma
    Plasma Chemistry and Plasma Processing, 2016
    Co-Authors: Hyun-woo Park, Woo-jae Chung, Dong-wha Park
    Abstract:

    An AC-pulsed tornado gliding Arc Plasma was employed for CO_2 conversion via CO_2 decomposition and dry reforming reactions. A stable and high-efficient constant Arc length discharge mode was obtained in this Plasma reactor. And then, CO_2 conversion was studied under this discharge mode. In the case of CH_4/CO_2 = 0, CO_2 was converted to CO and O_2 via the CO_2 decomposition reaction. Energy efficiency of 29 % was attained at CO_2 conversion of 6 %. With strong reducing agent CH_4 added into CO_2, the main contributor of CO_2 conversion changed from CO_2 decomposition to dry reforming of CH_4. Conversions of CH_4 and CO_2, energy efficiency and energy cost changed sharply at CO_2/CH_4 ratios lower than 1/4, while they changed slowly at CH_4/CO_2 ratios above 1/4. In the case of CH_4/CO_2 = 2/3, energy efficiency of 68 % and syngas energy cost of 1.6 eV/mole were achieved at CH_4 conversion of 29 % and CO_2 conversion of 22 %.

  • high efficient conversion of co2 in ac pulsed tornado gliding Arc Plasma
    Plasma Chemistry and Plasma Processing, 2016
    Co-Authors: Hyun-woo Park, Woo-jae Chung, Dong-wha Park
    Abstract:

    An AC-pulsed tornado gliding Arc Plasma was employed for CO2 conversion via CO2 decomposition and dry reforming reactions. A stable and high-efficient constant Arc length discharge mode was obtained in this Plasma reactor. And then, CO2 conversion was studied under this discharge mode. In the case of CH4/CO2 = 0, CO2 was converted to CO and O2 via the CO2 decomposition reaction. Energy efficiency of 29 % was attained at CO2 conversion of 6 %. With strong reducing agent CH4 added into CO2, the main contributor of CO2 conversion changed from CO2 decomposition to dry reforming of CH4. Conversions of CH4 and CO2, energy efficiency and energy cost changed sharply at CO2/CH4 ratios lower than 1/4, while they changed slowly at CH4/CO2 ratios above 1/4. In the case of CH4/CO2 = 2/3, energy efficiency of 68 % and syngas energy cost of 1.6 eV/mole were achieved at CH4 conversion of 29 % and CO2 conversion of 22 %.

  • decomposition of nitrogen trifluoride using low power Arc Plasma
    Plasma Science & Technology, 2013
    Co-Authors: Jeehun Ko, Hyun-woo Park, Sooseok Choi, Dong-wha Park
    Abstract:

    The low power Arc Plasma is characterized by extremely high enthalpy and temperature and it is easy to generate and control, and thus thermal decomposition process based on the Plasma torch is receiving a great attention for decomposing non-degradable greenhouse gases. In order to elevate the economic feasibility, the effects of input power, waste gas flow rate and additive gases on the destruction and removal efficiency (DRE) of NF3 are examined. Specific energy density (SED) deceases as the flow rate increases, and accordingly, the DRE is reduced. The DRE is basically determined by the specific energy density. The highest DRE of NF3 was 97% for the waste gas flow rate of 100 L/min at a low input power level of 2 kW with the help of hydrogen additional gas. The inlet and outlet concentration of NF3 was analyzed using Fourier transform infrared spectroscopy (FT-IR) for DRE of NF3 evaluation. As a result, large amount of NF3 can be efficiently decomposed by low power Arc Plasma systems.

Hyun-woo Park - One of the best experts on this subject based on the ideXlab platform.

  • High-Efficient Conversion of CO_2 in AC-Pulsed Tornado Gliding Arc Plasma
    Plasma Chemistry and Plasma Processing, 2016
    Co-Authors: Hyun-woo Park, Woo-jae Chung, Dong-wha Park
    Abstract:

    An AC-pulsed tornado gliding Arc Plasma was employed for CO_2 conversion via CO_2 decomposition and dry reforming reactions. A stable and high-efficient constant Arc length discharge mode was obtained in this Plasma reactor. And then, CO_2 conversion was studied under this discharge mode. In the case of CH_4/CO_2 = 0, CO_2 was converted to CO and O_2 via the CO_2 decomposition reaction. Energy efficiency of 29 % was attained at CO_2 conversion of 6 %. With strong reducing agent CH_4 added into CO_2, the main contributor of CO_2 conversion changed from CO_2 decomposition to dry reforming of CH_4. Conversions of CH_4 and CO_2, energy efficiency and energy cost changed sharply at CO_2/CH_4 ratios lower than 1/4, while they changed slowly at CH_4/CO_2 ratios above 1/4. In the case of CH_4/CO_2 = 2/3, energy efficiency of 68 % and syngas energy cost of 1.6 eV/mole were achieved at CH_4 conversion of 29 % and CO_2 conversion of 22 %.

  • high efficient conversion of co2 in ac pulsed tornado gliding Arc Plasma
    Plasma Chemistry and Plasma Processing, 2016
    Co-Authors: Hyun-woo Park, Woo-jae Chung, Dong-wha Park
    Abstract:

    An AC-pulsed tornado gliding Arc Plasma was employed for CO2 conversion via CO2 decomposition and dry reforming reactions. A stable and high-efficient constant Arc length discharge mode was obtained in this Plasma reactor. And then, CO2 conversion was studied under this discharge mode. In the case of CH4/CO2 = 0, CO2 was converted to CO and O2 via the CO2 decomposition reaction. Energy efficiency of 29 % was attained at CO2 conversion of 6 %. With strong reducing agent CH4 added into CO2, the main contributor of CO2 conversion changed from CO2 decomposition to dry reforming of CH4. Conversions of CH4 and CO2, energy efficiency and energy cost changed sharply at CO2/CH4 ratios lower than 1/4, while they changed slowly at CH4/CO2 ratios above 1/4. In the case of CH4/CO2 = 2/3, energy efficiency of 68 % and syngas energy cost of 1.6 eV/mole were achieved at CH4 conversion of 29 % and CO2 conversion of 22 %.

  • decomposition of nitrogen trifluoride using low power Arc Plasma
    Plasma Science & Technology, 2013
    Co-Authors: Jeehun Ko, Hyun-woo Park, Sooseok Choi, Dong-wha Park
    Abstract:

    The low power Arc Plasma is characterized by extremely high enthalpy and temperature and it is easy to generate and control, and thus thermal decomposition process based on the Plasma torch is receiving a great attention for decomposing non-degradable greenhouse gases. In order to elevate the economic feasibility, the effects of input power, waste gas flow rate and additive gases on the destruction and removal efficiency (DRE) of NF3 are examined. Specific energy density (SED) deceases as the flow rate increases, and accordingly, the DRE is reduced. The DRE is basically determined by the specific energy density. The highest DRE of NF3 was 97% for the waste gas flow rate of 100 L/min at a low input power level of 2 kW with the help of hydrogen additional gas. The inlet and outlet concentration of NF3 was analyzed using Fourier transform infrared spectroscopy (FT-IR) for DRE of NF3 evaluation. As a result, large amount of NF3 can be efficiently decomposed by low power Arc Plasma systems.

Woo-jae Chung - One of the best experts on this subject based on the ideXlab platform.

  • High-Efficient Conversion of CO_2 in AC-Pulsed Tornado Gliding Arc Plasma
    Plasma Chemistry and Plasma Processing, 2016
    Co-Authors: Hyun-woo Park, Woo-jae Chung, Dong-wha Park
    Abstract:

    An AC-pulsed tornado gliding Arc Plasma was employed for CO_2 conversion via CO_2 decomposition and dry reforming reactions. A stable and high-efficient constant Arc length discharge mode was obtained in this Plasma reactor. And then, CO_2 conversion was studied under this discharge mode. In the case of CH_4/CO_2 = 0, CO_2 was converted to CO and O_2 via the CO_2 decomposition reaction. Energy efficiency of 29 % was attained at CO_2 conversion of 6 %. With strong reducing agent CH_4 added into CO_2, the main contributor of CO_2 conversion changed from CO_2 decomposition to dry reforming of CH_4. Conversions of CH_4 and CO_2, energy efficiency and energy cost changed sharply at CO_2/CH_4 ratios lower than 1/4, while they changed slowly at CH_4/CO_2 ratios above 1/4. In the case of CH_4/CO_2 = 2/3, energy efficiency of 68 % and syngas energy cost of 1.6 eV/mole were achieved at CH_4 conversion of 29 % and CO_2 conversion of 22 %.

  • high efficient conversion of co2 in ac pulsed tornado gliding Arc Plasma
    Plasma Chemistry and Plasma Processing, 2016
    Co-Authors: Hyun-woo Park, Woo-jae Chung, Dong-wha Park
    Abstract:

    An AC-pulsed tornado gliding Arc Plasma was employed for CO2 conversion via CO2 decomposition and dry reforming reactions. A stable and high-efficient constant Arc length discharge mode was obtained in this Plasma reactor. And then, CO2 conversion was studied under this discharge mode. In the case of CH4/CO2 = 0, CO2 was converted to CO and O2 via the CO2 decomposition reaction. Energy efficiency of 29 % was attained at CO2 conversion of 6 %. With strong reducing agent CH4 added into CO2, the main contributor of CO2 conversion changed from CO2 decomposition to dry reforming of CH4. Conversions of CH4 and CO2, energy efficiency and energy cost changed sharply at CO2/CH4 ratios lower than 1/4, while they changed slowly at CH4/CO2 ratios above 1/4. In the case of CH4/CO2 = 2/3, energy efficiency of 68 % and syngas energy cost of 1.6 eV/mole were achieved at CH4 conversion of 29 % and CO2 conversion of 22 %.

Don N Futaba - One of the best experts on this subject based on the ideXlab platform.

  • diameter control of single walled carbon nanotube forests from 1 3 3 0 nm by Arc Plasma deposition
    Scientific Reports, 2015
    Co-Authors: Guohai Chen, Yasuaki Seki, Hiroe Kimura, Shunsuke Sakurai, Motoo Yumura, Kenji Hata, Don N Futaba
    Abstract:

    We present a method to both precisely and continuously control the average diameter of single-walled carbon nanotubes in a forest ranging from 1.3 to 3.0 nm with ~1 A resolution. The diameter control of the forest was achieved through tuning of the catalyst state (size, density, and composition) using Arc Plasma deposition of nanoparticles. This 1.7 nm control range and 1 A precision exceed the highest reports to date.

Sumio Iijima - One of the best experts on this subject based on the ideXlab platform.

  • mass production of single wall carbon nanotubes by the Arc Plasma jet method
    Chemical Physics Letters, 2000
    Co-Authors: Yoshinori Ando, Xinluo Zhao, Kaori Hirahara, Kazutomo Suenaga, Shunji Bandow, Sumio Iijima
    Abstract:

    Abstract Single-wall carbon nanotubes (SWNTs) were mass-produced by a newly developed DC Arc Plasma jet method for the evaporation of a metal-doped carbon anode. The production rate of the cottonlike soot was significantly higher than that by conventional DC Arc discharge evaporation, and the highest yield was 1.24 g/min. Investigations by scanning electron microscopy, high-resolution transmission electron microscopy and Raman spectroscopy indicated that more than 50% of the cottonlike carbon soot was composed of fibrous bundles of SWNTs. Through analysis of the breathing modes in the Raman spectra of the cottonlike soot, the diameter of each SWNT was determined to range from 1.28 to 1.52 nm.