CO2 capture performance of calcium-based synthetic sorbent with hollow core-shell structure under calcium looping conditions

Abstract

A novel calcium-based synthetic CO2 sorbent with hollow core-shell structure was prepared by a carbon microsphere template route where carbide slag, alumina cement and glucose were employed as the low-cost calcium precursor, support and carbon source, respectively. The effects of the alumina cement addition, the pre-calcination temperature during the preparation process, the carbon template addition and calcination conditions on CO2 capture performances of the calcium-based synthetic sorbents were studied during calcium looping cycles. The synthetic sorbent containing 5 wt.% alumina cement possesses the highest CO2 capture capacity during calcium looping cycles, which is mainly composed of CaO and Ca12Al14O33. The CO2 capture capacities of the synthetic sorbent under mild and severe calcination conditions can retain 0.37 and 0.29 g/g after 20 cycles, which are 57% and 99% higher than those of carbide slag under the same conditions, respectively.

A facile one-pot synthesis of CaO/CuO hollow microspheres featuring highly porous shells for enhanced CO2 capture in a combined Ca–Cu looping process via a template-free synthesis approach

“…3) target material coating/deposition; and 4) template removal. 34 Ma et al, 38 Armutlulu et al 39 and our group 36 successfully developed CaO hollow microspheres using this synthesis method, respectively, and confirmed the superiority of hollow microsphere structures for enhanced CO2 capture performance of CaO-based sorbents. However, in order to limit the complexity and to increase the throughput of the synthesis procedure, a favorable approach should not involve the use of any templates, as they must be first prepared and then finally removed.…”

A study of the synergistic effects of Mn/steam on CO2 capture performance of CaO by experiment and DFT calculation

“…(b) and (c), a shift to the highest binding energy of Ca 2p and O 1s in C‐Mn‐CaO was found, which was not observed in the original CaO. It means that it was easier for the Ca atom and O atom in C‐Mn‐CaO to give electrons to CO 2 than the original CaO, which assisted the fast formation of CO 3 . The doping of Mn in CaO was beneficial to the electron transport from CaO to CO 2 , which accelerated the carbonation rates of CaO.…”

“…Natural calcium‐based sorbents like limestone, dolomite, and some calcium‐based industrial wastes like carbide slag, are used to capture CO 2 during the calcium looping process. However, the decay in the CO 2 capture capacities of calcium‐based sorbents with the number of carbonation / calcination cycles, resulting from sintering, is the major problem that limits CO 2 capture efficiency and the large‐scale industrial application of calcium looping . Attempts have been made to improve the CO 2 capture capacities and the sintering resistance of calcium‐based sorbents during multiple cycles.…”

Stabilized Performance of Al‐Decorated and Al/Mg Co‐Decorated Spray‐Dried CaO‐Based CO2 Sorbents

“…The CaO‐based sorbents continuously circulate between the two interconnected reactors to achieve CO 2 removal from the flue gases . Although the CLP technology has a lot of advantages, i.e., high CO 2 ‐carrying capacity, abundant and low‐cost sorbent sources, widespread applicability etc., the rapid loss‐in‐capacity of CaO‐based sorbents is a prominent issue encountered during the long‐term CO 2 capture process , . Therefore, extensive efforts have been devoted to improve the CO 2 capture stability of CaO‐based sorbents, such as incorporation of inert supports , mechanical activation , , acid modification , addition of biotemplates , salt doping , and sol‐gel synthesis .…”

“…Until now, the researchers mainly focus on developing a number of effective inert supports to improve the CO 2 capture stability of CaO‐based sorbents, commonly including Al‐based , , Mg‐based , , Si‐based , , Ti‐based , , Zr‐based materials , etc. .…”