Abstract
The CO2 capture performances were demonstrated for Na2ZrO3 sorbents prepared by soft chemistry using varied sodium precursors and drying methods. It was found that ‘Na2C2O4 precursor+heated drying’ enabled superior sorption capacity (e.g. 22.77wt% CO2 uptake within 10min at 800°C in a 15vol% CO2 stream balanced by N2) to the other precursor-drying combinations. The as-identified strongest sorbent was further investigated at a series of carbonation temperatures (400–800°C) in N2-balanced purging streams with 15vol% and 50vol% CO2, corresponding post- and pre-combustion CO2 capture scenarios, respectively. The analysis of the resulting sorption capacity, stability and kinetics suggests that sodium diffusion is a more efficient driver than CO2 diffusion for the capture of CO2. Sintering and the subsequent densification inhibits CO2 diffusion but enhances sodium diffusion, which leads to a positive overall effect on the sorption performance. Hence, unlike other high-temperature solid sorbents such as CaO, sintering resistance during cyclic sorption is not a necessity for Na2ZrO3. In addition, higher CO2 fractions in the feed gas improve the sorption kinetics and stability by promoting sodium diffusion as well as CO2 diffusion.
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