Reaction Kinetics of Fe_2O_3 and BaCO_3to Prepare Ba_2Fe_2O_5

摘要

Carbon dioxide is a greenhouse gas and substantially affects the global warming and climate change, so study on the adsorption of carbon dioxide is very urgent. As a new CO_2 captor, Ba_2Fe_2O_5 was prepared by the solid state reaction of Fe_2O_3 with BaCO_3, following formula Fe_2O_3 + 2BaCO_3 = Ba_2Fe_2O_5 + 2CO_2. The reaction kinetics in isothermal condition was investigated by using the method of thermo-gravimetric analyzer (TGA). It was found that the reaction of Fe_2O_3 with BaCO_3 was controlled by the diffusion step in the product layer, and the kinetics process could be described by the RPP model (Real Physical Picture) with the apparent activation energy extracted to be 161.122 kj/mol.