Issue
Korean Journal of Chemical Engineering,
Vol.21, No.3, 601-610, 2004
A Kinetic Study on the Conversion of Methane to Higher Hydrocarbons in a Radio-Frequency Discharge
This study investigated methane conversion with direct current discharge at low pressure in a radio frequency. The main gaseous products of the reaction were ethane, ethylene, acetylene and propane. This study was concentrated on the influence of discharge conditions on the conversion of methane to higher hydrocarbons. Reaction temperature, electron density and mean residence time were calculated from experimental data and mathematical relations. The maximum conversion of the methane was about 45% with the pure methane as a reactant. Ethane was the main product when the reaction occurred in the glow discharge. Ethane selectivity decreased with the increase of the gas temperature. The kinetics of reactions was also analyzed from possible reaction equations and various rate constant data. Consequently, the dissociation constant and the density of radicals could be obtained at any experimental conditions.
[References]
  1. Arigorev IS, Melihov EZ, "Physical Constants," Energoatomizdat, Moscow, 1991
  2. Baulch DL, Drysdale DD, Horne DG, Lloyd AC, "Evaluated Kinetics Data for High Temperature Reactions," Univ. of Leads, V. 1, 1972
  3. Bird RB, Stewart WE, Lightfoot EN, "Transport Phenomena," John Wiley & Sons, New York, 1960
  4. Brunet H, Lavarini B, Phys. Lett. A, 30, 181, 1969
  5. Cho W, Baek Y, Pang H, Kim YC, Korean J. Chem. Eng., 15(5), 500, 1998
  6. Dean AM, J. Phys. Chem., 94, 1432, 1990
  7. Granovsky VL, "Electric Current in Gas," Moscow, 1952
  8. Hwang BB, Yeo YK, Na BK, Korean J. Chem. Eng., 20(4), 631, 2003
  9. Jeong HK, Kim SC, Han C, Lee H, Song HK, Na BK, Korean J. Chem. Eng., under revision, 2001
  10. Kassel LS, Am. Chem. Soc., 54, 3949, 1932
  11. Kim SS, Lee H, Na BK, Song HK, Korean J. Chem. Eng., 20(5), 869, 2003
  12. Lee H, Savinov SY, Song HK, Na BK, J. Chem. Eng. Jpn., 34(11), 1356, 2001
  13. Lieberman MA, Lichtenberg AJ, "Principles of Plasma Discharge and Material Processing," John Wiley & Sons, New York, 1994
  14. Na BK, Choi JW, Lee H, Song HK, Korean J. Chem. Eng., 19(6), 917, 2002
  15. Ochkin VN, Savinov YS, Sovolev NN, "Electron Excited Molecules in Nonequilibrium Plasma," N.Y. Niva Publ., Proc. Lebedev Phys. Inst., V. 179, Suppl. V.2, 1989
  16. Raizer YP, "Gas Discharge Physics," Springer-Verlag, Berlin, 1991
  17. Rusanov VD, Fridman AA, "Physics of Chemically Active Plasma," Nauka, Moscow, 1984
  18. Savinov SY, Lee H, Song HK, Na BK, Ind. Eng. Chem. Res., 38(7), 2540, 1999
  19. Savinov SY, Lee H, Song HK, Na BK, Korean J. Chem. Eng., 19(4), 564, 2002
  20. Savinov SY, Lee H, Song HK, Na BK, Plasma Chem. Plasma Process., 23(1), 159, 2003