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

doi:10.1016/j.catcom.2005.04.004

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

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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 language	English
Pages (from-to)	404-408
Number of pages	5
Journal	Catalysis Communications
Volume	6
Issue number	6
DOIs	https://doi.org/10.1016/j.catcom.2005.04.004
State	Published - Jun 2005

Funding

This work was conducted at the Oak Ridge National Laboratory and supported by the Division of Chemical Sciences. Office of Basic Energy Sciences, U.S. Department of Energy, under Contract No. DE-AC05-000R22725 with UT-Battelle, LLC and in part by NSF through Grant CHE-0211029. This research was supported in part by an appointment for W.Y. and S.M. to the Oak Ridge National Laboratory Postdoctoral Research Associates Program administered jointly by the Oak Ridge Institute for Science and Education and Oak Ridge National Laboratory.

Funders	Funder number
Division of Chemical Sciences
National Science Foundation	CHE-0211029
U.S. Department of Energy	DE-AC05-000R22725
Basic Energy Sciences
Oak Ridge National Laboratory
Oak Ridge Institute for Science and Education

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10.1016/j.catcom.2005.04.004

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

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.",

author = "Wenfu Yan and Valeri Petkov and Mahurin, {Shannon M.} and Overbury, {Steven H.} and Sheng Dai",

year = "2005",

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AU - Yan, Wenfu

AU - Petkov, Valeri

AU - Mahurin, Shannon M.

AU - Overbury, Steven H.

AU - Dai, Sheng

PY - 2005/6

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AB - 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.

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

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