Synthesis and structure characterization of Ru nanoparticles stabilized by PVP or {gamma}-Al{sub 2}O{sub 3}

Journal Article · Mon Nov 03 00:00:00 EST 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.11.006· OSTI ID:21143979

Zawadzki, Miroslaw ^[1]; Okal, Janina ^[1]

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1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, PO Box 141, 50-950 Wroclaw (Poland)

Uniform and stable Ru nanoparticles were synthesized by reduction of RuCl{sub 3} in ethylene glycol (EG) in the presence of poly(N-vinyl-2-pyrrolidone) by using microwave-assisted solvothermal method. The obtained materials were characterized by UV-vis, FT-IR, XPS, XRD and TEM techniques, and used as precursors of heterogeneous metal colloid catalysts. Characterization by TEM showed that as-prepared PVP-stabilized Ru nanoparticles have small average diameters (below 2 nm) and narrow size distributions (1-3 nm). Diffraction data confirmed that a crystallite size is around 2.0 nm. A colloidal Ru/{gamma}-Al{sub 2}O{sub 3} catalyst was obtained by two different methods: immobilization of the PVP-stabilized Ru colloid on the support or by in situ deposition of Ru colloid, e.g., reduction of RuCl{sub 3} with EG in the presence of the {gamma}-alumina. It was found that both synthesis methods produced the Ru/{gamma}-Al{sub 2}O{sub 3} catalysts with narrow size distributions of metallic nanoparticles, that are distributed uniformly over the support. However, only in situ preparation of the colloidal Ru/{gamma}-Al{sub 2}O{sub 3} catalyst results in chlorine free system with high activity for hydrogen chemisorption. The H{sub 2} uptake on the Ru(PVP)/{gamma}-Al{sub 2}O{sub 3} catalyst was very low because the ruthenium surface was strongly occluded with a thin layer of polymer molecules.

• OSTI ID: 21143979
• Journal Information: Materials Research Bulletin, Vol. 43, Issue 11; Other Information: DOI: 10.1016/j.materresbull.2007.11.006; PII: S0025-5408(07)00508-9; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CATALYSTS
CHEMISORPTION
COLLOIDS
DEPOSITION
FOURIER TRANSFORMATION
HYDROGEN
INFRARED SPECTRA
MICROWAVE RADIATION
NANOSTRUCTURES
PVP
REDUCTION
RUTHENIUM
RUTHENIUM CHLORIDES
SURFACE PROPERTIES
SYNTHESIS
THIN FILMS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY