Inorganic carbonate composites as potential high temperature CO₂ sorbents with enhanced cycle stability

Abstract

A Ca/Mg/Al oxide composite was synthesised and showed a high CO2 uptake of 0.537 g g−1 at 650 °C with high uptake even after 100 cycles.

Synthesis and characterization of sodium hafnium oxide (Na2HfO3) and its high-temperature CO2 sorption properties

“…Modied CaCO 3 and MgCO 3 also showed high stability with 1% loss in CO 2 uptake capacity aer 23 cycles. 19 Overall, NHO-1 and 1.25 can be considered to be chemically and structurally stable aer repeated carbonation and calcination when compared with other sorbents. We are aware that as our experiments were performed using pure CO 2 and N 2 , they cannot be considered to be realistic for real-life applications.…”

“…Sintering reduces the accessible surface area available for the reaction between CO 2 and the sorbent, which decreases the CO 2 uptake capacity. 18 In order to improve the performance of inorganic oxide sorbents, researchers have focused their research on (1) preventing sintering by adding a thermal stabilizer to the sorbents [19][20][21][22][23] or (2) developing sorbents with high cycling stability. [24][25][26] Zirconium-based inorganic oxides such as Na 2 ZrO 3 , Li 2 ZrO 3 , and K 2 ZrO 3 have attracted attention in recent decades as potential CO 2 sorbents.…”

Synthetic solid oxide sorbents for CO2 capture: state-of-the art and future perspectives

“…Similarly, Vall et al 56 employed MgO and Al 2 O 3 to stabilise a synthetic CaO sorbent, obtained by calcining highly porous amorphous calcium carbonate (HPACC -BET surface area of over 450 m 2 /g). Whilst MgO alone can effectively stabilise the CaO sorbent, the sorbent synergistically stabilised by both MgO and Al 2 O 3 yielded even higher stability, showing only a 2.8 % decrease in the CO 2 uptake capacity after 23 cycles (1 st cycle 54.2 wt.% (69.1 mol%).…”

“…Figure 3. Scanning electron micrograph of CaO stabilised with both MgO and Al 2 O 3 a) as-synthesized and b)after 23 cycles of carbonation/calcination 56. …”

Calcium looping carbon capture: Progress and prospects

“…[ 143 ] Sun et al [ 144 ] showed the positive effect of CeO 2 against sintering for the CaO‐based sorbent. Moreover, Vall et al [ 145 ] used MgO and Al 2 O 3 to stabilize a synthetic CaO sorbent using co‐precipitation method. It was shown that the sorbent synergistically stabilized by both MgO and Al 2 O 3 , resulting in high stability with only a 2.8% decrease in the CO 2 uptake capacity after 23 cycles.…”