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

Abstract

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.

Authors:
 [1];  [1]
  1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, PO Box 141, 50-950 Wroclaw (Poland)
Publication Date:
OSTI Identifier:
21143979
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 43; Journal 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); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Zawadzki, Miroslaw, and Okal, Janina. Synthesis and structure characterization of Ru nanoparticles stabilized by PVP or {gamma}-Al{sub 2}O{sub 3}. United States: N. p., 2008. Web. doi:10.1016/j.materresbull.2007.11.006.
Zawadzki, Miroslaw, & Okal, Janina. Synthesis and structure characterization of Ru nanoparticles stabilized by PVP or {gamma}-Al{sub 2}O{sub 3}. United States. doi:10.1016/j.materresbull.2007.11.006.
Zawadzki, Miroslaw, and Okal, Janina. Mon . "Synthesis and structure characterization of Ru nanoparticles stabilized by PVP or {gamma}-Al{sub 2}O{sub 3}". United States. doi:10.1016/j.materresbull.2007.11.006.
@article{osti_21143979,
title = {Synthesis and structure characterization of Ru nanoparticles stabilized by PVP or {gamma}-Al{sub 2}O{sub 3}},
author = {Zawadzki, Miroslaw and Okal, Janina},
abstractNote = {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.},
doi = {10.1016/j.materresbull.2007.11.006},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 11,
volume = 43,
place = {United States},
year = {2008},
month = {11}
}