In situ synthesis and catalytic activity in CO oxidation of metal nanoparticles supported on porous nanocrystalline silicon

Sergej Polisski, Bernhard Goller, Karen Wilson, Dmitry Kovalev, Vladimir Zaikowskii, Alexei Lapkin

Research output: Contribution to journalArticle

Abstract

Reactive surface of mesoporous nanocrystalline silicon was used to synthesise noble metal nanoparticles via in situ reduction of the precursor salt solutions. The synthetic methodology for metal nanoparticle formation was systematically developed, and reaction conditions of metal salts reduction were optimised to prepare nanoparticles of controlled size distribution in the order 5–10 nm inside the mesoporous silicon template. CO oxidation was used as a test reaction for the synthesised Pt/porous silicon catalysts. Sharp reaction light-off was observed at about 120 °C on the optimised catalysts. The catalysts were shown to be stable in the extended steady-state runs and in the catalysts re-use experiments. Metal nanoparticles were shown to be stable to sintering at elevated temperatures up to 1000 °C. However, after thermal treatment on air, Pt nanoparticles were covered by a SiOx layer and were less active in CO oxidation.
Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalJournal of Catalysis
Volume271
Issue number1
Early online date5 Mar 2010
DOIs
Publication statusPublished - 12 Apr 2010

Keywords

  • metal nanoparticles
  • porous silicon
  • nanocrystalline silicon
  • CO oxidation
  • Pt catalyst

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