Layered Double Hydroxides-Based Mixed Metal Oxides: Development of Novel Structured Sorbents for CO2 Capture Applications

Manohara Gudiyor Veerabhadrappa, M. Mercedes Maroto-Valer, Yuhang Chen, Susana Garcia

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Layered double hydroxide (LDHs)-based mixed metal oxides (MMOs) are widely studied as the medium to high temperature (200-400 °C) CO2 capture sorbents. However, most of the studies are carried out using the powdered samples. To upgrade these sorbents for industrial-scale CO2 capture, it is important to move away from the powdered form and develop structured sorbents. Moreover, the CO2 capture properties of these sorbents need to be improved in terms of capture capacity and cycling stability. Here we are utilizing a modified amide hydrolysis method to improve the CO2 capture capacities of LDHs-based MMOs. Subsequently, aqueous exfoliation coupled with the freeze-drying technique was utilized to develop LDHs-based novel MMOs. Exfoliated LDH nano sheets were pelletized (2 mm) to circumvent the challenges associated with powder samples when used in industrial-scale applications. The obtained pellets have an average crushing load of 11.1 N and 4.3 MPa of compressive strength, which indicate their good mechanical stability. The MMOs pellets showed a narrow distribution of pores (8-10 nm) with very good surface area (264 m2/g) and pore volume (1.27 cm3/g). They also had much improved CO2 capture capacities at ambient pressure and both low (2.17 mmol/g, 30 °C) and medium temperature (1.43 mmol/g, 200 °C), as compared to previously reported pristine MMOs powder samples. The pelletized structured sorbents also outperformed commercial LDH-based pellets by several fold.

Original languageEnglish
Pages (from-to)11805–11813
Number of pages9
JournalACS Applied Materials and Interfaces
Volume13
Issue number10
Early online date4 Mar 2021
DOIs
Publication statusPublished - 17 Mar 2021

Keywords

  • aqueous exfoliation
  • freeze-drying
  • layered double hydroxides
  • mixed metal oxides
  • structured sorbents and CO capture

ASJC Scopus subject areas

  • Materials Science(all)

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