Performance of Extruded Particles from Calcium Hydroxide and Cement for CO₂ Capture

Abstract

The reversible reaction of CaO with CO2 can be used for CO2 capture. However, two challenging problems, i.e., loss-in-capacity and high attrition rate for CaO-based sorbents, must be solved before it can be practically applied. In this paper, sorbents with various CaO contents were prepared from calcium hydroxide and cement using a screw extruder and the physical and chemical properties of the sorbents were obtained. The mechanical properties of sorbent particles were tested by friability and compression testers, and the sorption capacity and regenerability were measured in a thermogravimetric analyzer. It appears that the sorbents occupied acceptable attrition resistance and good mechanical strength. In the meantime, the sorbent particles showed higher CO2-capture capacities compared to pure CaO after 18 cycles, which was attributed to the stable phase of Ca12Al14O33 in the sorbents. The sorbent particles would be suitable for the calcium looping processes.

Coal gasification with in situ CO2 capture by the synthetic CaO sorbent in a 1 kWth dual fluidised-bed reactor

“…Consequently, the uniform distribution of mayenite among CaO micrograins leads to retarded sintering of calcium based sorbent. It has been reported that calcium based sorbents having mayenite as the binder exhibit stable and high CO 2 absorption capacities [12,13]. The final sorbents had a diameter of w1.5 mm with various lengths.…”

Preparation and Application of the Sol–Gel Combustion Synthesis-Made CaO/CaZrO3 Sorbent for Cyclic CO2 Capture Through the Severe Calcination Condition

“…Meanwhile, the crushing strength of SGCS-made Ca 8 Zr 2 was 1.63 N, above the crushing criterion of 1 N suggested for the potential materials needed in the realistic fluidized bed system [50] and the abrasion index was lower than 8% (by mass) loss with the initial 10 min duration at the rotation 3000 r·min -1 , comparative to the sorbent prepared with Ca(OH) 2 and cement as sorbent precursors by Qin et al [44]. Therefore, Ca 8 Zr 2 would be applicable to CO 2 capture in the realistic fluidized bed system.…”

“…Finally, resistance to fragmentation and abrasion are very important criteria for sorbents applied in the realistic CO 2 capture system [43][44][45]. And the two criteria for the SGCS-made CaO/CaZrO 3 sorbent were further measured using a SHIMPO FGJ-5 crushing strength apparatus [NIDEC-SHIMPO (ZheJiang) Corporation, China] and an ordered abrasion tester (Dalian Smart tester Factory, China), respectively.…”

Carbon dioxide removal using calcium aluminate carbonates on titanic oxide under warm-gas conditions

“…The results demonstrated that Ca 30 /Al/Ti 3.4 has the best combination of stability and high capacity among the tested sorbents. Other studies have illustrated that if sintering can be effectively controlled, the sorption/desorption cycles should continue indefinitely [34,35]. According to the TG analysis, the synthetic sorbents yielded superior recovery performances (96-98%), proving that Ca/Al/Ti composed of LDHs is more stable than CaO-based sorbents.…”

“…The sorbent stability can be significantly enhanced by incorporating suitable inert particles into CaO, yielding well-distributed oxides within the calcium oxides. Impregnating CaO with an inert particle helps to avoid the deterioration of the spent sorbent, for example, of CaO/ SiO 2 [10], Ca/Al-oxide [11], Zr/Ca complex [12], limestone/kaolin [13], CaO/aluminate cement [14], and extruded particles of Ca(OH) 2 /cement [15].…”