Supported silver catalysts for the oxidation of ethylene the effects of thermal treatment of alumina as catalyst support

Journal Article · Tue May 01 04:00:00 EDT 1979 · J. Catal.; (United States)

DOI:https://doi.org/10.1002/chin.197930116· OSTI ID:6634816

Kanoh, H; Nishimura, T; Ayame, A

Silver (40Vertical Bar3< by wt) was supported on alumina prepared from hydrogel by heat treating at 300/sup 0/-1800/sup 0/C. With increasing alumina treating temperature, the catalyst surface area decreased from 171 to 0.37 sq m/g. The activity for ethylene oxidation at 250/sup 0/C increased with increasing surface area from approx. 70Vertical Bar3< conversion (0.37 sq m/g) to 100Vertical Bar3< approx. 10 sq m/g, 1150/sup 0/C pretreatment temperature), and the selectivity for ethylene oxide decreased with increasing surface area (0.37-10 sq m/g) from approx. 60Vertical Bar3< to zero. Pulsed kinetic studies on the oxidation of ethylene, ethylene oxide, and acetaldehyde, and of ethylene isomerization to acetaldehyde at 230/sup 0/-270/sup 0/C showed that ethylene oxide isomerization occurred on the alumina support as well as on silver and was always slower than acetaldehyde oxidation to carbon dioxide on the silver; that direct oxidation of ethylene to carbon dioxide occurred and that it was the predominant reaction on catalysts pretreated at high temperature and unsupported silver; and that the formation of carbon dioxide via ethylene oxide was the preferred path on catalysts pretreated at lower temperatures.

• Research Organization: Muroran Inst. Technol.
• OSTI ID: 6634816
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 57:3; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical &amp; Physicochemical Properties
400301* -- Organic Chemistry-- Chemical &amp; Physicochemical Properties-- (-1987)
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONVERSION
DATA
ELEMENTS
ETHYLENE
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
KINETICS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SILVER
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE EFFECTS
TRANSITION ELEMENTS