Isotopic oxygen exchange on supported metal and bimetal catalysts
The isotopic oxygen exchange technique was applied to four supported metal and bimetal catalytic systems. In the first system, rubidium-gold/silica catalysts with rubidum-gold ratios of 0.25:1 to 1.0:1 and a total metal content of approx. 0.7Vertical Bar3< by wt were studied at 250/sup 0/-320/sup 0/C and 7-80 mm Hg oxygen partial pressure rubidium was the active component. Two series of platinum-gold/silica catalysts were studied at 390/sup 0/C and 4-73 mm Hg oxygen partial pressure. In Series A, the total metal content was approx. 0.7Vertical Bar3< by wt, and the platinum-gold ratio was 0 to 1:1. In Series B, the platinum content was 0.7Vertical Bar3< by wt, and the gold content, 0-5.5Vertical Bar3< by wt. In both series, platinum was 5-6 orders of magnitude more active than gold, and Series A was 2-30 times more active than Series B. In the third system, two supported silver catalysts that were selective to ethylene oxide formation and two that were nonselective were studied at 150/sup 0/-220/sup 0/C and 8-80 mm Hg oxygen partial pressure. Surface silver in all the catalysts was oxidized to silver oxide, but in the selective case, the oxygen was largely molecular; in the nonselective, atomic. Gold on silica-alumina catalysts showed an interaction between the gold and the support at their interface.
- OSTI ID:
- 6971600
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
GOLD
CATALYTIC EFFECTS
PLATINUM
RUBIDIUM
SILVER
BIMETALS
CATALYST SUPPORTS
EXPERIMENTAL DATA
HIGH TEMPERATURE
ISOTOPIC EXCHANGE
METALS
OXYGEN
QUANTITY RATIO
REACTION KINETICS
SILICA
TEMPERATURE EFFECTS
ALKALI METALS
CHALCOGENIDES
DATA
ELEMENTS
INFORMATION
KINETICS
MINERALS
NONMETALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SILICON COMPOUNDS
SILICON OXIDES
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties