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Surface chemistry on transition metal colloids: An infrared and NMR study of carbon monoxide adsorption on colloidal platinum

Journal Article · · Journal of Catalysis; (USA)
; ; ;  [1]
  1. Exxon Research and Engineering Co., Annandale, NJ (USA)
Highly dispersed (<10{angstrom}) platinum has been prepared in colloidal solution by condensing platinum vapor into a solution of triisobutylaluminoxane in methylcyclohexane. Carbon monoxide, adsorbed in a linear mode on the surface of the colloidal metal, has been characterized by infrared spectroscopy and {sup 13}C NMR. The chemical shift of the adsorbed CO is 192 ppm, and the absence of a Knight shift is interpreted in terms of a pseudomolecular description of the highly dispersed platinum particles, which are not large enough to exhibit metallic properties. The CO covered colloid is converted by hydrolysis into the molecular platinum carbonyl anion clusters (Pt{sub 3}(CO){sub 6}){sub n}{sup 2 {minus}}, n = 3, 4.
OSTI ID:
5679669
Journal Information:
Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 129:2; ISSN 0021-9517; ISSN JCTLA
Country of Publication:
United States
Language:
English