Details

Autor(en) / Beteiligte

• Nesterov, N. S.
• Shalygin, A. S.
• Pakharukova, V. P.
• Martyanov, O. N.

Titel

Coprecipitation of Au clusters and alumina sol in supercritical CO2—the facile way to stabilize gold nanoparticles within oxide matrix

Ist Teil von

• Journal of sol-gel science and technology, 2019-12, Vol.92 (3), p.523-528

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2019

Quelle

SpringerLink

Beschreibungen/Notizen

• A novel method for the synthesis of catalytically active composites based on gold clusters incorporated into an alumina matrix was proposed. The method combines sol–gel and supercritical fluid technologies. The composites were synthesized by precipitating of gold clusters and alumina sol mixture in the supercritical antisolvent (SAS) carbon dioxide medium. Gold clusters were synthesized in the colloidal solution of alumina sol in situ (one-pot synthesis) via controlled reduction of Au III using PPh 3 as a stabilizer for the first time. It was shown that this method allows us to stabilize gold clusters with sizes less than 2 nm in the alumina matrix with a developed specific surface area ( S BET  = 441 m 2 /g) and a narrow pore size distribution. The obtained composite does not contain stabilizer, which may poison the catalyst. The developed approach makes possible to synthesize catalytically active composites with a certain amount of gold cluster and oxide matrix of different nature. Highlights The gold based cluster composites were obtained via supercritical antisolvent precipitation. The composites contain gold clusters with sizes less than 2 nm. The composites have a developed specific surface and narrow pore size distribution.