CO2 sorption properties of Li4SiO4 with a Li2ZrO3 coating. (December 2019)

• Record Type: Journal Article
• Authors: Buelens, L.C.; Poelman, Hilde; Detavernier, Christophe; Marin, Guy B.; Galvita, Vladimir V.
• Is Part Of: Journal of CO₂ utilization. Volume 34(2019)
• Page Start: 688
• Page End: 699
• Publication Date: 2019-12
• Subjects: CO2 sorbent -- Lithium orthosilicate -- Carbonation; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2019.08.022
• Languages: English
• ISSNs: 2212-9820

Abstract

Highlights: Three different CO2 sorbents based on lithium orthosilicate were prepared and characterized. Li4 SiO4 @Li2 ZrO3 was the best performing material in terms of sorption capacity, stability and rate of carbonation-decarbonation. Core-shell structure saturated with Li, allowing for easy restructuring during carbonation and fast regeneration. Abstract: The application of a CO2 sorbent which releases CO2 at a lower temperature than calcium oxide is of interest in view of reducing the operating temperature or increasing the operating pressure of the super-dry reforming process. To this end, three different CO2 sorbents based on lithium orthosilicate (Li4 SiO4 ) were prepared and characterized: (i) Li4 SiO4 as such; (ii) zirconia coated Li4 SiO4, denoted Li4 SiO4 @ZrO2 ; (iii) Li4 SiO4, coated with lithium metazirconate and denoted as Li4 SiO4 @Li2 ZrO3 . While the carbonation properties of Li4 SiO4 were found satisfactory, its decarbonation was incomplete. Li4 SiO4 @ZrO2 on the other hand, was found to contain Li2 SiO3 and Li2 ZrO3 rather than the anticipated Li4 SiO4 and showed fast carbonation and decarbonation of Li2 ZrO3 . The best performing material in terms of CO2 sorption capacity, stability and rate of carbonation-decarbonation was Li4 SiO4 @Li2 ZrO3 . Its superior performance is ensured by the core-shell structure saturated with Li, allowing for easy restructuring during carbonation and fast regeneration upon decarbonation.