Preparation of a Low-Cost K2CO3/Al2O3 Sorbent for CO2 Capture at Flue-Gas Operating Conditions

• Published in: Adsorption science & technology 2013-08, Vol.31 (8), p.683-689
• Main Authors: Esmaili, Javad, Ehsani, Mohammad Reza
• Format: Article
• Language: English
• ISSN: 0263-6174; 2048-4038
• DOI: 10.1260/0263-6174.31.8.683

In this study, the efficiency of a low-cost K2CO3/Al2O3 sorbent as a CO2 capture support was investigated. The sorbent was prepared by impregnating K2CO3 on industrial-grade Al2O3. The CO2 capture capacity of the sorbent was calculated from the breakthrough curve of the CO2 adsorption inside a fixed-bed reactor, in the presence of H2O and at an adsorption temperature of 60 °C. An adsorption capacity of 75.4 mg CO2/g of sorbent was obtained. The stability of capture capacity of the sorbent was higher than that of the reference sorbent. The changes in the pore volume and surface area were 0.020 cm3/g and 5.5 m2/g, respectively, after five cycles of adsorption and regeneration. However, there were minor changes in the pore-size distribution and surface area of the sorbent after five cycles. This sorbent can be considered to be used in large-scale applications.