Abstract
Potassium-doped lithium zirconate (Li 2ZrO 3) sorbents with similar crystallite but different aggregate sizes were prepared by a solid-state reaction method from mixtures of Li 2CO 3, K 2CO 3, and ZrO 2 of different particle sizes. Carbon dioxide sorption rate on the prepared Li 2ZrO 3 sorbents increases with decreasing sorbent aggregate size. It is the size of the aggregate, not the crystallite, of Li 2ZrO 3 that controls the sorption rate. Temperature effect on CO 2 sorption is complex, depending on both kinetic and thermodynamic factors. A mathematical model based on the double-shell sorption mechanism was established for CO 2 sorption kinetics and it can fit experimental data quite well. Above 500°C, the rate-limiting step of CO 2 sorption is the diffusion of oxygen ions through the ZrO 2 shell formed during the carbonation reaction. Oxygen ion conductivities in the ZrO 2 shell were obtained by regression of the experimental CO 2 uptake curves with the model and are consistent with the literature data.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
