Structural analysis of sonochemically prepared Au/Pd nanoparticles dispersed in porous silica matrix

Takashi Nakagawa, Hiroaki Nitani, Shuji Tanabe, Kenji Okitsu, Satoshi Seino, Yoshiteru Mizukoshi, Takao A. Yamamoto

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

Bimetallic Au/Pd nanoparticles supported on a silica matrix were prepared by an ultrasonic technique. The samples heat-treated at 100, 200, 300 and 400°C were examined with techniques of XRD (X-ray diffraction), TEM and XAS (X-ray absorption spectrometry) for studying correlation between their structure and the catalytic activity of hydrogenation of cyclohexene. Even after the heat treatment at 400°C, the particles were smaller than 20 nm and well dispersed in the matrix without agglomeration nor sintering. Results of the XRD, TEM and XAS indicated that the as-prepared particles have a core/shell structure of Au/Pd and transform into a random alloy at 300°C. The catalysis seemed to be deactivated by alloying.

Original languageEnglish
Pages (from-to)249-254
Number of pages6
JournalUltrasonics Sonochemistry
Volume12
Issue number4
DOIs
Publication statusPublished - 2005 Mar

Keywords

  • 81.07.Bc
  • Bimetallic particles
  • Gold
  • Nanoparticles
  • Palladium
  • Structural analysis
  • XAFS

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Environmental Chemistry
  • Radiology Nuclear Medicine and imaging
  • Acoustics and Ultrasonics
  • Organic Chemistry
  • Inorganic Chemistry

Fingerprint Dive into the research topics of 'Structural analysis of sonochemically prepared Au/Pd nanoparticles dispersed in porous silica matrix'. Together they form a unique fingerprint.

Cite this