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/sup 13/C nuclear magnetic resonance of carbon monoxide on platinum: study of a highly dispersed catalyst

Thesis/Dissertation ·
OSTI ID:7046733
The /sup 13/C Nuclear Magnetic Resonance lines, spin-lattice relaxation times T/sub 1/ and spin-spin relaxation times T/sub 2/ of CO chemisorbed on the surface layer of small particles of Pt metal have been observed by the method of spin echoes as a function of magnetic field, temperature, CO coverage and Pt dispersion. The samples are industrial catalysts: Pt supported on eta-alumina, with Pt dispersions ranging from 4% to 76%. After cleaning, the samples are exposed to CO isotopically enriched to 90% /sup 13/C. The /sup 13/C line shapes and spin-lattice relaxation times establish the presence of a /sup 13/C Knight shift ..delta..H.
Research Organization:
Illinois Univ., Urbana (USA)
OSTI ID:
7046733
Country of Publication:
United States
Language:
English