CaO carbonation with CO 2 is potentially a very important reaction for CO 2 removal from exhaust gas produced in power plants and other metallurgical plants and for hydrogen production by promoting water gas shift reaction in fossil fuel gasification. A mathematical model based on the grain model was applied for modeling of this reaction. Diffusion of gaseous phase through the product layer and structural change of the grains were considered in the model. The modeling results show that ignoring the reaction kinetics controlling regime in the early stage of the reaction and replacing it with a regime considering both the reaction kinetics and diffusion can generate good simulation results. The frequency factor of the reaction rate equation and the diffusivity of CO 2 through the CaCO 3 layer were justified to get the best fit at different temperature range from 400 to 750 o C with respect to experimental data in the literature. The mathematical model switches to a pure diffusion controlling regime at final stage of reaction.
The present work deals with reduction of cobalt oxide, CoO, with methane. Thermogravimetry was used for finding kinetic parameters of the reduction reaction. The reaction of cobalt oxide with methane was carried out in the temperature range 800 °C to 950 °C at atmospheric pressures with porous pellets prepared from cobalt oxide powder with a mean particle size of 10.6 m. Assuming that the reaction is first order with respect to methane concentration, the activation energy is f6ound to be155 kJ/mol (Ϯ20).
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