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Particle size dependence of CO 2  absorption rate of powdered Ba 2 Fe 2 O 5  with three kinds of particle size was studied by XRD, SEM, particle size distribution measurement and thermogravimetry. From the particle size distribution measurement, average particle sizes of the powdered Ba 2 Fe 2 O 5  samples were estimated about 52.5 μm, 77.5 μm and 100.0 μm, respectively. Results show that the reaction of CO 2  with Ba 2 Fe 2 O 5  was controlled by the diffusion step in the product layer, and the kinetics process could be described by the RPP model (Real Physical Picture). Moreover, Ba 2 Fe 2 O 5  exhibits a good recycling performance though the adsorption capacity is reduced slightly during the cycle processes, and the pathway of the CO 2  adsorption–desorption on Ba 2 Fe 2 O 5  has also been obtained, which suggested that Ba 2 Fe 2 O 5  is a promising CO 2  absorbent material.

CO 2 Absorption of Powdered Ba 2 Fe 2 O 5 with Different Particle Size