Abstract
Abstract Despite the very good CO 2 uptake of lithium based silicates at high temperature, this material is expensive and not very abundant. Therefore, there is the need to develop high temperature sorbents based on low-cost and widely available materials. In this work, Na-silicates prepared by mixing sodium carbonate with fly ash (FA) in the molar ratio of Na2CO3:SiO2 of 1:1 and 4:1 were evaluated for their capacity to chemisorb CO 2 at 700 °C. This temperature was chosen as it is compatible with post-combustion technologies. Pure Na-FA sorbent (NaCO3:SiO2 molar ratio of 1:1) was able to adsorb 1.8 mmol CO 2 /g sorbent. The CO 2 uptake capacity increased to 2mmol CO 2 /g sorbent in presence of 20% Li2CO3 as additive. Therefore, this work suggests that Na-silicate materials with acceptable CO 2 uptake can be developed as high temperature sorbents for post-combustion technologies.
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