Fundamental investigations of supported monometallic and bimetallic catalysts by proton magnetic resonance spectroscopy
Proton magnetic resonance spectroscopy, or nuclear magnetic resonance (NMR) of hydrogen, has been applied to investigate silica-supported Group VIII monometallic and Group VIII-Group IB bimetallic catalysts and alumina- and silica-supported platinum-rhenium bimetallic catalysts. Two adsorbed states of hydrogen, i.e., irreversible and reversible hydrogen, on the surfaces of monometallic Ru, Pt, and Cu particles and bimetallic Ru-Group Ib, Pt-Group Ib, and Pt-Re particles were observed directly via proton NMR. The same amounts of the irreversible hydrogen adsorbed on pure Ru catalysts were measured by both proton NMR and the volumetric technique. The electronic environments on surfaces of monometallic catalysts are sensitive to changes in metal dispersion, state of adsorbed hydrogen, and residual chlorine. Surface compositions for the Ru--Cu and Pt--Cu bimetallic catalysts were determined by NMR of adsorbed hydrogen. 297 refs., 96 figs., 19 tabs.
- Research Organization:
- Ames Lab., IA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6767823
- Report Number(s):
- IS-T-1441; ON: DE91000610
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BIMETALS
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINE
COPPER
DEHYDROGENATION
ELEMENTS
GOLD
HALOGENS
HYDROGEN
MAGNETIC RESONANCE
METALS
MINERALS
NONMETALS
NUCLEAR MAGNETIC RESONANCE
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
RESONANCE
RHENIUM
RUTHENIUM
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SILVER
SORPTION
SURFACE PROPERTIES
TRANSITION ELEMENTS
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BIMETALS
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINE
COPPER
DEHYDROGENATION
ELEMENTS
GOLD
HALOGENS
HYDROGEN
MAGNETIC RESONANCE
METALS
MINERALS
NONMETALS
NUCLEAR MAGNETIC RESONANCE
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
RESONANCE
RHENIUM
RUTHENIUM
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SILVER
SORPTION
SURFACE PROPERTIES
TRANSITION ELEMENTS