Development of High-performance CaO-based CO2 Sorbents Stabilized with Al2O3 or MgO. (July 2017)

• Record Type: Journal Article
• Authors: Naeem, Muhammad Awais; Armutlulu, Andac; Kierzkowska, Agnieszka; Müller, Christoph R.
• Is Part Of: Energy procedia. Volume 114(2017)
• Page Start: 158
• Page End: 166
• Publication Date: 2017-07
• Subjects: CO2 capture -- calcium looping -- carbon template -- mayenite -- sintering; Power resources -- Congresses; Power resources -- Periodicals; Power resources; Conference proceedings; Periodicals; 333.7905
• DOI: 10.1016/j.egypro.2017.03.1158
• Languages: English
• ISSNs: 1876-6102

Abstract

Abstract: Two organic templating methods, viz., a Pechini and a resorcinol/formaldehyde (RF) carbon-gel approach were employed to prepare CaO-based, Al2 O3 - and MgO-stabilized CO2 sorbents. Scanning electron microscopy confirmed the formation of micro- and nanostructured morphologies in the synthetic sorbents. The cyclic CO2 uptake performance of the sorbents was assessed in a thermo-gravimetric analyzer and compared to the reference limestone. It was found that as little as 10 mol% Al 3+ was required to obtain cyclically stable CO2 sorbents independent of the synthesis method used. However, a sintering-induced capacity decay of MgO-supported CaO could only be overcome via RF carbon-gel templating approach using at least 20 mol% of Mg 2+ for stabilization. X-ray diffraction revealed the formation of mayenite, whereas MgO did not form a solid solution with CaO. The CO2 uptake of the best synthetic sorbent exceeded limestone by more than 300% (after 10 carbonation/calcination cycles).