Facile reactivation of used CaO-based CO2 sorbent via physical treatment: Critical relationship between particle size and CO2 sorption performance

Hyung Jin Yoon, Sungyong Mun, Ki Bong Lee

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Herein we report a new and facile mechanical approach for maximizing the CO2 sorption performance of CaO sorbents, and also for recovering the sorption performance of the used (or deactivated) sorbent. We compared the physicochemical properties of CaO-based sorbents, which could change depending on their preparation methods, and determined that the CaO particle size was the most critical factor that affected their CO2 sorption performance. The CO2 sorption performance of CaO-based sorbents could be maximized via the simple physical reduction of their particle size, and this was experimentally demonstrated using ball-milling. The CO2 sorption uptake of CaO prepared using the conventional solid-state method was significantly increased to the highest ever reported level after ball-milling, and it reached 98.0% of the theoretical maximum CO2 sorption capacity. The most important application of the particle-size-dependency of CaO-based sorbents on their CO2 sorption uptake is the reactivation of used sorbents via reducing the size of the aggregated or sintered bulky particles that form after cyclic usage. The CO2 sorption uptake of the used CaO (~32.9 wt% after 10 alternative sorption–regeneration cycles) was successfully recovered (almost doubled) to ~64.7 wt% after ball-milling. This is the first time a facile mechanical-grinding-based reactivation method, which appeared to be highly efficient and directly applicable to the continuous calcium looping technology, has been developed and used.

Original languageEnglish
Article number127234
JournalChemical Engineering Journal
Volume408
DOIs
Publication statusPublished - 2021 Mar 15

Bibliographical note

Funding Information:
This work was supported by the Energy Technology Development Business of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government Ministry of Trade, Industry & Energy (grant number 20182020201260 ) and the National Research Foundation of Korea (NRF) through the Super Ultra Low Energy and Emission Vehicle Engineering Research Center funded by the Korean government Ministry of Science and ICT (grant number NRF-2016R1A5A1009592).

Funding Information:
This work was supported by the Energy Technology Development Business of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government Ministry of Trade, Industry & Energy (grant number 20182020201260) and the National Research Foundation of Korea (NRF) through the Super Ultra Low Energy and Emission Vehicle Engineering Research Center funded by the Korean government Ministry of Science and ICT (grant number NRF-2016R1A5A1009592).

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

  • CO sorption
  • CaO
  • Calcium looping
  • Carbon dioxide capture and storage
  • Reactivation

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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