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Hydrogen Production by Pyrolysis of Natural Gas : Thermodynamic Analysis  

Yoon, Y.H. (School of Chemical Engineering & Technology, Yeungnam Univ.)
Park, N.K. (School of Chemical Engineering & Technology, Yeungnam Univ.)
Chang, W.C. (School of Chemical Engineering & Technology, Yeungnam Univ.)
Lee, T.J. (School of Chemical Engineering & Technology, Yeungnam Univ.)
Hur, T. (Department of Materials Chemistry & Engineering, Konkuk Univ.)
Lee, B.G. (Environment & Process Technology Division, KIST)
Baek, Y.S. (LNG Technology Research Center)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.13, no.1, 2002 , pp. 42-51 More about this Journal
Abstract
Methane can be converted directly to hydrogen by pyrolysis. The reaction is highly endothemic and heat must be supplied at high temperatures. Gibbs free energy minimization calculations have been carried out for the methane pyrolysis to determine equilibrium products. The calculation parameters are the temperature, the initial H/C ratio, the pressure and Gibbs energies of each substance. Methane, ethylene, acetylene, benzene, naphthalene, and hydrogen are the main products. Excluding hydrogen, it is observed that ethylene and aromatics(benzene+naphthalene) are predominant products below 1400K, whereas acetylene is significantly formed above 1400K. Hydrogen dilution increases the selectivities for ethylene and acetylene and decreases the selectivity for aromatics. Increasing the pressure also decreases the decomposition of methane.
Keywords
Methane; Hydrogen; Pyrolysis; Carbon black; Thermodynamic equilibrium;
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