Measurement and modeling of adsorption equilibria of cobalt (III) acetylacetonate on MCM-41 mesoporous silica in the presence of supercritical carbon dioxide with methanol co-solvent

Ikuo Ushiki, Mio Koike, Taichi Shimizu, Yoshiyuki Sato, Shigeki Takishima, Hiroshi Inomata

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Adsorption equilibria of cobalt (III) acetylacetonate (Co(acac)3) in the presence of supercritical carbon dioxide (scCO2) with methanol co-solvent on MCM-41 mesoporous silica were studied at 313–353 K and 12.5–20.0 MPa from experimental and model calculation viewpoints. The measured data indicated that the amount of the adsorbed metal precursor decreased with increasing pressure and decreasing temperature, which could be explained by CO2 density effects. Correlation by the Dubinin-Astakhov equation was applicable for examining the adsorption equilibria of the metal precursor on the mesoporous silica in scCO2 while considering the molecular size of the precursor, affinity for the adsorbent, and CO2 density effects. Simulated results with the DA equation implied that the methanol co-solvent can affect the adsorption equilibria of Co(acac)3 on the MCM-41 adsorbent in scCO2.

Original languageEnglish
Pages (from-to)329-335
Number of pages7
JournalJournal of Supercritical Fluids
Volume140
DOIs
Publication statusPublished - 2018 Oct

Keywords

  • Adsorption equilibria
  • Cobalt (III) acetylacetonate
  • Mesoporous silica
  • Metal precursor
  • Supercritical carbon dioxide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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