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Eutectic mixture promoted CO2 sorption on MgO-TiO2 composite at elevated temperature.

Vishwanath Hiremath1, Monica Louise T Trivino1, Jeong Gil Seo1

  • 1Department of Energy Science and Technology, Myongji University, Gyeonggi-do 17058, Republic of Korea.

Journal of Environmental Sciences (China)
|December 12, 2018
PubMed
Summary

New MgO-TiO2 sorbents, enhanced with a eutectic mixture, show high capacity and stability for elevated temperature carbon dioxide (CO2) capture. This advancement is crucial for pre-combustion capture technologies.

Keywords:
Elevated temperature CO(2) captureEutectic mixture promoterMgO stabilityMgO-TiO(2) composite

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Developing effective carbon dioxide (CO2) sorbents for high-temperature applications is critical for advancing pre-combustion capture technologies.
  • Promoter-based systems using alkali/alkaline earth metal nitrates/carbonates offer enhanced CO2 uptake but face challenges with sorbent stability, particularly for magnesium oxide (MgO) during temperature swing regeneration.

Purpose of the Study:

  • To develop stable and highly efficient solid sorbents for elevated temperature CO2 capture.
  • To investigate the performance of MgO-TiO2 sorbents promoted by a eutectic mixture of KNO3 and LiNO3 for CO2 sorption at high temperatures.

Main Methods:

  • Synthesis of MgO-TiO2 solid sorbents incorporating a eutectic mixture of potassium nitrate (KNO3) and lithium nitrate (LiNO3).
  • Evaluation of CO2 sorption capacity and kinetics at elevated temperatures (300°C).
  • Assessment of sorbent stability and recyclability under temperature swing regeneration conditions.

Main Results:

  • The developed MgO-TiO2 sorbents promoted by the eutectic mixture exhibited significantly improved CO2 sorption capacity (>30 wt.%) at 300°C.
  • The enhanced performance is attributed to an alternative CO2 sorption pathway facilitated by the ionization of dispersed MgO within the eutectic mixture.
  • The MgO-TiO2 framework contributed to retaining MgO configuration, and composite structures were essential for improved recyclability and stability during temperature swing operations.

Conclusions:

  • The eutectic mixture-promoted MgO-TiO2 sorbents represent a promising next-generation material for high-temperature CO2 capture.
  • Composite sorbent design is vital for achieving high CO2 sorption capacity and excellent recyclability at elevated temperatures.
  • These findings offer a pathway for more efficient and stable pre-combustion carbon capture technologies.