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Ultrafast and stable CO2 capture using Alkali metal salt-promoted MgO–CaCO3 sorbents

(2018) ACS APPLIED MATERIALS & INTERFACES . 10(24). p.20611-20620
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Abstract
As a potential candidate for precombustion CO2 capture at intermediate temperatures (200-400 °C), MgO-based sorbents usually suffer from low kinetics and poor cyclic stability. Herein, a general and facile approach is proposed for the fabrication of high-performance MgO-based sorbents via incorporation of CaCO3 into MgO followed by deposition of a mixed alkali metal salt (AMS). The AMS-promoted MgO-CaCO3 sorbents are capable of adsorbing CO2 at an ultrafast rate, high capacity, and good stability. The CO2 uptake of sorbent can reach as high as above 0.5 gCO2 gsorbent-1 after only 5 min of sorption at 350 °C, accounting for vast majority of the total uptake. In addition, the sorbents are very stable even under severe but more realistic conditions (desorption in CO2 at 500 °C), where the CO2 uptake of the best sorbent is stabilized at 0.58 gCO2 gsorbent-1 in 20 consecutive cycles. The excellent CO2 capture performance of the sorbent is mainly due to the promoting effect of molten AMS, the rapid formation of CaMg(CO3)2, and the plate-like structure of sorbent. The exceptional ultrafast rate and the good stability of the AMS-promoted MgO-CaCO3 sorbents promise high potential for practical applications, such as precombustion CO2 capture from integrated gasification combined cycle plants and sorption-enhanced water gas shift process.
Keywords
CO2 capture, MgO sorbent, alkali metal salts, high cyclic stability, ultrafast sorption rate

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Chicago
Cui, Hongije, Qiming Zhang, Yuanwu Hu, Chong Peng, Xiangchen Fang, Zhenmin Cheng, Vladimir Galvita, and Zhiming Zhou. 2018. “Ultrafast and Stable CO2 Capture Using Alkali Metal Salt-promoted MgO–CaCO3 Sorbents.” Acs Applied Materials & Interfaces 10 (24): 20611–20620.
APA
Cui, Hongije, Zhang, Q., Hu, Y., Peng, C., Fang, X., Cheng, Z., Galvita, V., et al. (2018). Ultrafast and stable CO2 capture using Alkali metal salt-promoted MgO–CaCO3 sorbents. ACS APPLIED MATERIALS & INTERFACES , 10(24), 20611–20620.
Vancouver
1.
Cui H, Zhang Q, Hu Y, Peng C, Fang X, Cheng Z, et al. Ultrafast and stable CO2 capture using Alkali metal salt-promoted MgO–CaCO3 sorbents. ACS APPLIED MATERIALS & INTERFACES . 2018;10(24):20611–20.
MLA
Cui, Hongije et al. “Ultrafast and Stable CO2 Capture Using Alkali Metal Salt-promoted MgO–CaCO3 Sorbents.” ACS APPLIED MATERIALS & INTERFACES 10.24 (2018): 20611–20620. Print.
@article{8570009,
  abstract     = {As a potential candidate for precombustion CO2 capture at intermediate temperatures (200-400 {\textdegree}C), MgO-based sorbents usually suffer from low kinetics and poor cyclic stability. Herein, a general and facile approach is proposed for the fabrication of high-performance MgO-based sorbents via incorporation of CaCO3 into MgO followed by deposition of a mixed alkali metal salt (AMS). The AMS-promoted MgO-CaCO3 sorbents are capable of adsorbing CO2 at an ultrafast rate, high capacity, and good stability. The CO2 uptake of sorbent can reach as high as above 0.5 gCO2 gsorbent-1 after only 5 min of sorption at 350 {\textdegree}C, accounting for vast majority of the total uptake. In addition, the sorbents are very stable even under severe but more realistic conditions (desorption in CO2 at 500 {\textdegree}C), where the CO2 uptake of the best sorbent is stabilized at 0.58 gCO2 gsorbent-1 in 20 consecutive cycles. The excellent CO2 capture performance of the sorbent is mainly due to the promoting effect of molten AMS, the rapid formation of CaMg(CO3)2, and the plate-like structure of sorbent. The exceptional ultrafast rate and the good stability of the AMS-promoted MgO-CaCO3 sorbents promise high potential for practical applications, such as precombustion CO2 capture from integrated gasification combined cycle plants and sorption-enhanced water gas shift process.},
  author       = {Cui, Hongije and Zhang, Qiming and Hu, Yuanwu and Peng, Chong and Fang, Xiangchen and Cheng, Zhenmin and Galvita, Vladimir and Zhou, Zhiming},
  issn         = {1944-8244},
  journal      = {ACS APPLIED MATERIALS \& INTERFACES },
  language     = {eng},
  number       = {24},
  pages        = {20611--20620},
  title        = {Ultrafast and stable CO2 capture using Alkali metal salt-promoted MgO--CaCO3 sorbents},
  url          = {http://dx.doi.org/10.1021/acsami.8b05829},
  volume       = {10},
  year         = {2018},
}

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