/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
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Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
DIFFUSION
ELEMENTS
EVEN-ODD NUCLEI
ISOTOPES
KNIGHT SHIFT
LIGHT NUCLEI
MAGNETIC FIELDS
MAGNETIC RESONANCE
METALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
RELAXATION
RESONANCE
SEPARATION PROCESSES
SORPTION
SPIN-LATTICE RELAXATION
SPIN-SPIN RELAXATION
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENTS
360104* -- Metals & Alloys-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
DIFFUSION
ELEMENTS
EVEN-ODD NUCLEI
ISOTOPES
KNIGHT SHIFT
LIGHT NUCLEI
MAGNETIC FIELDS
MAGNETIC RESONANCE
METALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
RELAXATION
RESONANCE
SEPARATION PROCESSES
SORPTION
SPIN-LATTICE RELAXATION
SPIN-SPIN RELAXATION
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENTS