1 Citation (Scopus)

Abstract

In this work, K2CO3-containing composite materials were synthesized based on a mesoporous zirconia aerogel prepared by an epoxide-assisted sol-gel method using supercritical drying in ethanol. The porous ZrO2 was impregnated with an aqueous solution of potassium carbonate to obtain composite materials with K2CO3 weight content ranging from 9 to 29 wt%. All the composites were tested in the process of CO2 absorption from the air with a relative humidity of 25% followed by thermal desorption at 200 °C. The samples after the CO2 absorption step were characterized by Fourier transform infrared spectroscopy and X-ray diffraction methods. Among the materials studied, the composite sorbent containing 23 wt% K2CO3 demonstrated the highest dynamic CO2 absorption capacity (4.6 wt%) in the temperature-swing absorption (TSA) cycles. The results indicate that a certain part of K2CO3 loaded into zirconia mesopores forms surface species which do not actively participate in the CO2 absorption and desorption processes. For the composite K2CO3/ZrO2 material with the optimal K2CO3 loading, CO2 absorption capacity is higher compared to the values obtained for K2CO3/γ-Al2O3 composite sorbents studied under the same conditions. Taking into account that this material demonstrates stable CO2 absorption capacity values in the consecutive TSA cycles and needs a relatively low temperature for regeneration, it should be considered for application in Direct Air Capture units.

Original languageEnglish
Article number110624
Number of pages9
JournalMicroporous and Mesoporous Materials
Volume310
DOIs
Publication statusPublished - Jan 2021

Keywords

  • Aerogel
  • Carbon dioxide
  • Direct air capture
  • Potassium carbonate
  • Zirconia
  • ZIRCONIA AEROGEL
  • ADSORBENTS
  • REGENERATION
  • FIXED-BED
  • ADSORPTION
  • SURFACE CHARACTERIZATION
  • DEGRADATION
  • K2CO3/AL2O3
  • ABSORPTION
  • CARBON-DIOXIDE

Fingerprint

Dive into the research topics of 'K<sub>2</sub>CO<sub>3</sub>-containing composite sorbents based on a ZrO<sub>2</sub> aerogel for reversible CO<sub>2</sub> capture from ambient air'. Together they form a unique fingerprint.

Cite this