Mesoporous MgO enriched in Lewis base sites as effective catalysts for efficient CO2 capture

Lei Wang, Yi Yao, Trinh Tran, Patrick Lira, Steven Sternberg P.E., Richard Davis, Zhao Sun, Qinghua Lai, Sam Toan, Jianmin Luo, Yudai Huang, Yun Hang Hu, Maohong Fan

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Capturing CO2 has become increasingly important. However, wide industrial applications of conventional CO2 capture technologies are limited by their slow CO2 sorption and desorption kinetics. Accordingly, this research is designed to overcome the challenge by synthesizing mesoporous MgO nanoparticles (MgO-NPs) with a new method that uses PEG 1500 as a soft template. MgO surface structure is nonstoichiometric due to its distinctive shape; the abundant Lewis base sites provided by oxygen vacancies promote CO2 capture. Adding 2 wt % MgO-NPs to 20 wt % monoethanolamine (MEA) can increase the breakthrough time (the time with 90% CO2 capturing efficiency) by ∼3000% and can increase the CO2 absorption capacity within the breakthrough time by ∼3660%. The data suggest that MgO-NPs can accelerate the rate and increase CO2 desorption capacity by up to ∼8740% and ∼2290% at 90 °C, respectively. Also, the excellent stability of the system within 50 cycles is verified. These findings demonstrate a new strategy to innovate MEA absorbents currently widely used in commercial post-combustion CO2 capture plants.

Original languageEnglish (US)
Article number117398
JournalJournal of Environmental Management
Volume332
DOIs
StatePublished - Apr 15 2023

Bibliographical note

Funding Information:
The authors gratefully acknowledge Minnesota's Discovery, Research, and InnoVation Economy Program for financial support of this work. Parts of this work were done in the Characterization Facility at the University of Minnesota , which receives partial support from NSF through the MRSEC program.

Publisher Copyright:
© 2023

Keywords

  • Basic site density
  • CO capture
  • Flue gas
  • Monoethanolamine
  • Surface oxygen vacancy

PubMed: MeSH publication types

  • Journal Article

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