Super Beton Wisdom

Antonius Indarto, Dae Ryook Yang, Jelliarko Palgunadi, Jae-Wook Choi,
Hwaung Lee, Hyung Keun Song

Chemical Engineering and Processing, 2008, 47(1): 780-786

Abstract:
A series of methanol synthesis catalyst containing Cu–Zn–Al (CZA) were prepared by co-precipitation method and applied for partial oxidation of methane into methanol using dielectric barrier discharge (DBD). The methanol synthesis process was occurred at ambient temperature and atmospheric pressure. In our experiment, CZA showed a high catalytic activity to increase the production of methanol. The methanol selectivity of CZA-assisted plasma process was twice higher than that of non-catalytic plasma process. The addition of other metals on CZA catalyst also produced a significant effect on the methanol production and it was found that yttrium could the best addition metal compared to Pt, Fe, and Ni. Instead of methanol, the reaction products of plasma reactions were dominated by H2, CO, CO2, C2 and water. The optimum methanol selectivity reached 27% when 3% yttrium metal was doped over CZA.

Keywords: Methane oxidation; Methanol synthesis; Dielectric barrier discharge; Cu–Zn–Al; Heterogeneous catalyst 

© 2007 Published by Elsevier B.V
 

Antonius Indarto; Jae-wook Choi; Hwaung Lee; Hyung Keun Song

Plasma Devices and Operations, 14(1), 1 – 14
Abstract:

The decomposition of the chlorinated hydrocarbons CCl₄ and CHCl₃ in a gliding-arc plasma was examined. The effects of initial concentrations, total gas flow rates and power consumption were investigated. The conversion of the hydrocarbons mentioned above was relatively high. It could reach 80% for CCl₄ and 97% for CHCl₃. In atmospheric air as a carrier gas, the reaction was exothermic, and the main products were CO₂, CO and Cl₂. The transformation into CCl₄ was also detected for the decomposition reaction of CHCl₃. The conversion of these compounds increased with increasing frequency of power supplied and decreasing total gas flow rate.

Keywords: Plasma; Gliding arc; CCl₄; CHCl₃; Decomposition reaction

Antonius Indarto, Jae-Wook Choi, Hwaung Lee, and Hyung Keun Song

Energy, 2006, 31(14): 2986-2995

Abstract:
Methane conversion using gliding arc plasma has been studied. The process was conducted at atmospheric pressure. Four kinds of additive gases—helium, argon, nitrogen, and CO₂—were used to investigate their effects on methane conversion, as well as product selectivity, and discharged power. Methane conversion was increased with the increasing concentration of helium, argon, and nitrogen in the feed gas but decreased when CO₂ concentration increased. Qualitatively, hydrogen and acetylene were the major gas products. No liquid product was produced.

Keywords: Methane conversion; Plasma; Gliding arc discharge; Additive gas

© 2006 Published by Elsevier B.V

Antonius Indarto, Jae-Wook Cho, Hwaung Lee, Hyung Keun Song, and Jelliarko Palgunadi

Journal of Rare Earths, 2006, 24(5): 513-518

Abstract:

A 1% Fe-30% Hf over yttria-stabilized zirconia catalyst in combination with novel plasma-assisted activation techniques for a direct partial oxidation of methane to methanol was tested using dielectric barrier discharge plasma at ambient temperature and atmospheric pressure. However, instead of methanol, the reaction products were dominated by H₂, CO, CO₂, C₂, and H₂O. A catalytically activated plasma process increased the production of methanol compared with a noncatalytic plasma process. The maximum selectivity of methanol production was achieved using a catalyst that was treated at higher applied power.

Keywords: methane oxidation; dielectric barrier discharge; catalyst; plasma activation; rare earths

Antonius Indarto, Jae-Wook Choi, Hwaung Lee and Hyung Keun Song

Journal of Natural Gas Chemistry, 2006, 15(2): 87-92

Abstract:

The direct conversion of methane using a dielectric barrier discharge has been experimentally studied. Experiments with different values of flow rates and discharge voltages have been performed to investigate the effects on the conversion and reaction products both qualitatively and quantitatively. Experimental results indicate that the maximum conversion of methane has been 80% at an input flow rate of 5 ml/min and a discharge voltage of 4 kV. Experimental results also show that the optimum condition has occurred at a high discharge voltage and higher input flow rate. In terms of product distribution, a higher flow rate or shorter residence time can increase the selectivity for higher hydrocarbons. No hydrocarbon product was detected using the thermal method, except hydrogen and carbon. Increasing selectivity for ethane was found when Pt and Ru catalysts presented in the plasma reaction. Hydrogenation of acetylene in the catalyst surface could have been the reason for this phenomenon as the selectivity for acetylene in the products was decreasing.

Key words: plasma; dielectric barrier discharge; thermal process; methane conversion; catalyst