Preparation and Evaluation of CaO-Based CO2 Sorbents Deposited on Saffil Fiber Supports

• Published in: Energy & fuels Vol. 32; no. 8; pp. 8631 - 8640
• Main Authors: Ramirez-Solis, Sergio, Dupont, Valerie, Milne, Steven J
• Format: Journal Article
• Language: English
• Published: American Chemical Society 16.08.2018
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/acs.energyfuels.8b00986

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.