Mesoporous aerogel-like Al-Si oxides obtained via supercritical antisolvent precipitation of alumina and silica sols

Nikolai S. Nesterov, Anton S. Shalygin, Vera P. Pakharukova, Tatyana S. Glazneva, Oleg N. Martyanov

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

A method of alumina and silica sols precipitation in supercritical CO 2 has been developed for the first time to prepare alumina and silica doped alumina. The silicon content of samples is varied within the range from 0 to 30 mol. %. The approach suggested can be considered as a development of supercritical antisolvent (SAS) method that is widely used to prepare powders from solutions but not sols. The alumina and silicon-doped alumina obtained are shown to be mesoporous materials with narrow size distribution in the range of 3–5 nm. The high-temperature treatment of the sample containing 10 mol. % of Si results in the formation of γ-Al 2 O 3 phase followed by its transition into the δ-Al 2 O 3 phase at 1200 °C without α-Al 2 O 3 phase formation. It is demonstrated that the gradual introduction of silica into the alumina allows one to fine-tune the strength and amount of acid sites existing in oxides.

Original languageEnglish
Pages (from-to)110-119
Number of pages10
JournalJournal of Supercritical Fluids
Volume149
DOIs
Publication statusPublished - 1 Jul 2019

Keywords

  • Acidity
  • Alumina-silica
  • Mesoporous alumina
  • SAS
  • Sols
  • Supercritical antisolvent
  • FLUIDS
  • CO2
  • NANO-PARTICLES
  • BASICITY
  • NANOPARTICLES
  • HYDROGEN
  • GEORGEITE
  • FISCHER-TROPSCH CATALYSTS
  • SURFACE
  • ACIDITY

Fingerprint

Dive into the research topics of 'Mesoporous aerogel-like Al-Si oxides obtained via supercritical antisolvent precipitation of alumina and silica sols'. Together they form a unique fingerprint.

Cite this