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Isotopic oxygen exchange on supported metal and bimetal catalysts

Book ·
OSTI ID:6971600
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
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
ALKALI METALS
BIMETALS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
DATA
ELEMENTS
EXPERIMENTAL DATA
GOLD
HIGH TEMPERATURE
INFORMATION
ISOTOPIC EXCHANGE
KINETICS
METALS
MINERALS
NONMETALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
QUANTITY RATIO
REACTION KINETICS
RUBIDIUM
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SILVER
TEMPERATURE EFFECTS
TRANSITION ELEMENTS