C-H-O systems in the presence of iron oxide and iron carbide

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Gas phase compositions in equilibrium with Fe3O4, Fe2C, and Fe3C have been calculated over the complete composition range of the C-H-O system. The calculations were performed via the free energy minimization technique and cover a range of temperatures from 500 to 800 K, and pressures from 1 to 33⅓ atm. Also, over this range of conditions iron oxide and iron carbides boundaries were determined. These are presented on triangular coordinates in terms of atom percent of the elements C, H, and O. In addition, the equilibrium gas phase compositions are presented graphically as a function of the O/H atom ratio, and are discussed.


  • Coking
  • Iron carbide
  • Iron oxide
  • Thermodynamic equilibrium


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