Showing papers by "Alan W. Cramb published in 1981"

Studies of the interfacial kinetics of the reaction of CO 2 with liquid iron by the 14 CO 2 -CO isotope exchange reaction

Abstract: The rate of dissociation of CO2 on liquid iron between about 1540 and 1740 °C and at CO/CO2 ratios of 6.7 to 100 has been studied by means of the14CO2-CO exchange reaction. It is shown that for essentially pure iron the rate constant at low oxygen potential is consistent with that for the decarburization of liquid iron by CO2, indicating a common rate determining step. The influence of the gas composition on the rate is found to be consistent with surface blockage by adsorbed oxygen which obeys an ideal Langmuir adsorption isotherm over the experimentally accessible conditions. The adsorption coefficient for oxygen with respect to the infinitely dilute solution with 1 wt pct as standard state is deduced to be given by: logK′o = 11270/T – 4.09 The value of K′o at 1550 °C is found to be in good accord with the available data for the depression of the surface tension of liquid iron by oxygen.