Characterization of silica-gel supported Pt–Cu alloy particles prepared ia the sol–gel technique
Physical Chemistry Chemical Physics Pub Date: 2000-05-05 DOI: 10.1039/A909900J
Abstract
Silica-gel-supported
Pt–Cu alloy particles (diameter 4–8 nm) were prepared ![[italic v (to differentiate from Times ital nu)]](http://scimg.chem960.com/usr/1/A909900J.jpg)
ia
sol–gel processing from mixtures
of tetraethoxysilane, 3-(2-aminoethylamine)propyltriethoxysilane as anchors for metal ions, and acetates
of Cu2+ and [Pt(NH3)4]2+ as metal sources. The calcined and reduced materials were characterized by transmission electron microscopy (carrier morphology and metal dispersion), photoelectron spectroscopy (global charge
states) and diffuse reflectance infrared spectroscopy of chemisorbed CO to probe the electronic structure
of the metal particles. The results obtained by the combined techniques provide evidence for the formation
of supported Pt–Cu alloy particles, the detection of geometric and ligand effects, and an unusual redistribution
of
intensity between the
bands corresponding to CO adsorbed on Cu and Pt atoms.
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Journal Name：Physical Chemistry Chemical Physics
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