Abstract
Calcium-oxide-based sorbents were coated onto Saffil ceramic fibers by means of a wet impregnation method. The effect of synthesis parameters on the crystalline structure, morphology, and texture of the CaO layer was investigated by X-ray diffraction, scanning electron microscopy, and gas adsorption techniques. The analyses revealed that the optimized synthesis method produced a uniform coating composed of a network of CaO nanoflakes. The evaluation of the materials as CO2 sorbents was performed under repeated carbonation–decarbonation cycles using thermogravimetric analysis (TGA). A nominal 25 wt % loading of CaO gave a CO2 uptake capacity of 0.118 mg of CO2/mg of sorbent (carbonation at 650 °C in 90% CO2 and decarbonation at 850 °C in N2). A 5 wt % loading exhibited improved durability with a ∼30% decay in carrying capacity after 30 TGA cycles but at the expense of the initial uptake capacity.
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