Abstract
Triple-salt-promoted MgO composites (NaNO3, Na2CO3, and LiNO3) for precombustion CO2 capture were developed by a precipitation method with a controllable salt composition. MgO precursors were mixed and aged with salts to control the composition and morphology. The MgO composites exhibited a CO2 sorption capacity of 73 wt % in pure CO2 at 240 min and 300 °C and achieved a sorption capacity of 25 wt % within 10 min because of a high sorption rate. When a cyclic test was conducted with pure CO2 sorption for 60 min at 325 °C and N2 regeneration for 15 min at 425 °C (60/15 min cycle) as a reference, the cyclic capacity was 45 wt % after 30 cycles. On the other hand, considering the applicable capture processes, the sorption capacity during a fast cycle (10/5 min cycle) was 18 wt % under the same gas and temperature conditions. Finally, the working capacity of the MgO composite was evaluated under a simulated emission gas (29% CO2, 3% H2O, and balance N2) at 300 °C for sorption and CO2 at 450 °C for regeneration because of the importance of water vapor and CO2 regeneration in the evaluation. The rearrangement of the salts and the MgO grains during the initial cycles led to an enhanced working capacity. However, the working capacity declined along the subsequent cycles due to sintering, and it was severe under CO2 regeneration. However, the working capacity for the wet mixture sorption and CO2 regeneration stabilized after 20 cycles at 23 and 4.6 wt % for 60/15 min and 10/5 min cycles, respectively. The results indicate that the as-synthesized MgO composites are feasible for the practical application of precombustion CO2 capture.
| Original language | English |
|---|---|
| Pages (from-to) | 9725-9735 |
| Number of pages | 11 |
| Journal | Energy and Fuels |
| Volume | 31 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2017 Sep 21 |
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All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
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Salt-Composition-Controlled Precipitation of Triple-Salt-Promoted MgO with Enhanced CO2 Sorption Rate and Working Capacity. / Jin, Seongmin; Ho, Keon; Vu, Anh Tuan; Lee, Chang-Ha.
In: Energy and Fuels, Vol. 31, No. 9, 21.09.2017, p. 9725-9735.Research output: Contribution to journal › Article
TY - JOUR
T1 - Salt-Composition-Controlled Precipitation of Triple-Salt-Promoted MgO with Enhanced CO2 Sorption Rate and Working Capacity
AU - Jin, Seongmin
AU - Ho, Keon
AU - Vu, Anh Tuan
AU - Lee, Chang-Ha
PY - 2017/9/21
Y1 - 2017/9/21
N2 - Triple-salt-promoted MgO composites (NaNO3, Na2CO3, and LiNO3) for precombustion CO2 capture were developed by a precipitation method with a controllable salt composition. MgO precursors were mixed and aged with salts to control the composition and morphology. The MgO composites exhibited a CO2 sorption capacity of 73 wt % in pure CO2 at 240 min and 300 °C and achieved a sorption capacity of 25 wt % within 10 min because of a high sorption rate. When a cyclic test was conducted with pure CO2 sorption for 60 min at 325 °C and N2 regeneration for 15 min at 425 °C (60/15 min cycle) as a reference, the cyclic capacity was 45 wt % after 30 cycles. On the other hand, considering the applicable capture processes, the sorption capacity during a fast cycle (10/5 min cycle) was 18 wt % under the same gas and temperature conditions. Finally, the working capacity of the MgO composite was evaluated under a simulated emission gas (29% CO2, 3% H2O, and balance N2) at 300 °C for sorption and CO2 at 450 °C for regeneration because of the importance of water vapor and CO2 regeneration in the evaluation. The rearrangement of the salts and the MgO grains during the initial cycles led to an enhanced working capacity. However, the working capacity declined along the subsequent cycles due to sintering, and it was severe under CO2 regeneration. However, the working capacity for the wet mixture sorption and CO2 regeneration stabilized after 20 cycles at 23 and 4.6 wt % for 60/15 min and 10/5 min cycles, respectively. The results indicate that the as-synthesized MgO composites are feasible for the practical application of precombustion CO2 capture.
AB - Triple-salt-promoted MgO composites (NaNO3, Na2CO3, and LiNO3) for precombustion CO2 capture were developed by a precipitation method with a controllable salt composition. MgO precursors were mixed and aged with salts to control the composition and morphology. The MgO composites exhibited a CO2 sorption capacity of 73 wt % in pure CO2 at 240 min and 300 °C and achieved a sorption capacity of 25 wt % within 10 min because of a high sorption rate. When a cyclic test was conducted with pure CO2 sorption for 60 min at 325 °C and N2 regeneration for 15 min at 425 °C (60/15 min cycle) as a reference, the cyclic capacity was 45 wt % after 30 cycles. On the other hand, considering the applicable capture processes, the sorption capacity during a fast cycle (10/5 min cycle) was 18 wt % under the same gas and temperature conditions. Finally, the working capacity of the MgO composite was evaluated under a simulated emission gas (29% CO2, 3% H2O, and balance N2) at 300 °C for sorption and CO2 at 450 °C for regeneration because of the importance of water vapor and CO2 regeneration in the evaluation. The rearrangement of the salts and the MgO grains during the initial cycles led to an enhanced working capacity. However, the working capacity declined along the subsequent cycles due to sintering, and it was severe under CO2 regeneration. However, the working capacity for the wet mixture sorption and CO2 regeneration stabilized after 20 cycles at 23 and 4.6 wt % for 60/15 min and 10/5 min cycles, respectively. The results indicate that the as-synthesized MgO composites are feasible for the practical application of precombustion CO2 capture.
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U2 - 10.1021/acs.energyfuels.7b01428
DO - 10.1021/acs.energyfuels.7b01428
M3 - Article
AN - SCOPUS:85030120846
VL - 31
SP - 9725
EP - 9735
JO - Energy & Fuels
JF - Energy & Fuels
SN - 0887-0624
IS - 9
ER -