Powder XRD analysis and catalysis characterization of ultra-small gold nanoparticles deposited on titania-modified SBA-15

Wenfu Yan, Valeri Petkov, Shannon M. Mahurin, Steven H. Overbury, Sheng Dai

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Ultra-small gold nanoparticles (0.8-1 nm) are successfully deposited on titania-modified SBA-15 via a deposition-precipitation method. A comparison of experimental X-ray diffraction (XRD) patterns with theoretical ones shows that gold exists as Au3+ and Au0 in the as-synthesized and reduced catalyst, respectively. The XRD analyses also suggest that Au nanoparticles are more developed along the 〈111〉 direction forming a raft-type structure. Z-contrast transmission electron microscopy analyses indicate that the ultra-small gold nanoparticles are uniformly dispersed on the surface of the substrate. The material is found to possess high catalytic activity for low-temperature CO oxidation.

Original languageEnglish
Pages (from-to)404-408
Number of pages5
JournalCatalysis Communications
Volume6
Issue number6
DOIs
StatePublished - Jun 2005

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