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Monteverdi, S.
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article
Structural and surface propperties of Ni-Cu nanoparticles supported on SiO<inf>2</inf>
Abstract
<p>Nickel (1%) and nickel (1%)-copper (0.2-0.75%) metal phases supported on silica have been prepared by aqueous hydrazine reduction of nickel acetate at 70°C. They were characterized by XRD, TEM, H<sub>2</sub>-adsorption and TPD. The obtained results show that nickel is in a whisker-like shape or as a film of low density for the Ni/SiO<sub>2</sub> and Ni-Cu/SiO<sub>2</sub> systems respectively. The mean particle size is lower than 2 nm. Copper is in the shape of bigger facetted particles in the mono or bimetallic systems with a mean particle size of about 25 nm. The nickel phase dispersion, as determined by H<sub>2</sub>-adsorption, decreased in the presence of copper, as probably a result of Ni-Cu interactions. All the solids were found to be good hydrogen reservoir through the formation of H-spiltover species. The amounts of hydrogen stored changed with the copper content due to changes in the Ni-Cu interactions. © 2006 Springer Science + Business Media, Inc.</p>