Effect of impregnation conditions of cobalt nano particles in mesoporous silica using supercritical fluid solvent

Taichi Shimizu, Ikuo Ushiki, Masaki Ota, Yoshiyuki Sato, Hiroshi Inomata

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Cobalt nanoparticles were synthesized in mesoporous silica via a supercritical CO 2 impregnation technique using methanol as an entrainer at temperatures from 313 to 353 K, pressures from 20 to 25 MPa, and methanol concentrations from 5 to 20 mol%. The loading of cobalt particles in the materials, as quantified by energy-dispersive X-ray spectroscopy, was found to depend strongly on methanol concentration and slightly on temperature, and was revealed to reach a maximum of 3.8 wt% after calcination at 333 K, 20 MPa, a methanol concentration of 10 mol%, and a fixed reaction time of 5 h. Repeated treatment under the optimized conditions improved the Co loading up to 6.6 wt%, where the Co particles were observed by transmission electron microscopy (TEM) to be in the silica mesopores.

Original languageEnglish
Pages (from-to)615-621
Number of pages7
JournalJOURNAL of CHEMICAL ENGINEERING of JAPAN
Volume45
Issue number8
DOIs
Publication statusPublished - 2012 Aug 30

Keywords

  • Co catalysts
  • Mesoporous silica
  • Supercritical carbon dioxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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