Promoting effects of Re and Cs on silver catalyst in ethylene epoxidation

Journal Article · Sat Oct 31 23:00:00 EST 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90033-E· OSTI ID:5719917

Jingfa, Deng; Jun, Yang ^[1]; Shi, Zhang; Xiaohong, Yuan ^[2]

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1. Fundan Univ., Shanghai (China)
2. Shanghai Research Institute of Petrochemical Technology (China)

The study of ethylene epoxidation on promoted silver catalysts has been an active field in recent years. Alkali metals, boron, thallium, antimony, etc., are often incorporated into practical Ag/[alpha]-Al[sub 2]O[sub 3] catalysts in order to improve the selectivity of ethylene oxide. In recent work, it has been found that both Re and Cs added to Ag/[alpha]-Al[sub 2]O[sub 3] can increase the selectivity greatly, but no further information about the function of promoters was given. The authors have recently reported that the Re-promoted electrolytic silver catalyst appears to have a higher selectivity for ethylene epoxidation, and have investigated the function of Re. Most investigators had been concerned with the nature of promoters in ethylene epoxidation. The promoting effects of alkali and alkaline earth metal compounds were studied by Lambert and co-workers, and Campbell with surface science techniques. Most of these experiments were carried out on single Ag crystals. The present work describes the promoting effects of adding Re and Cs to electrolytic silver, on ethylene epoxidation and the adsorption of oxygen on the sample surface. The nature of Re and Cs promoters is also reported. 21 refs., 3 figs., 1 tab.

• OSTI ID: 5719917
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 138:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKALI METALS
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CESIUM
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
ETHYLENE
HETEROGENEOUS CATALYSIS
HYDROCARBONS
METALS
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PROMOTERS
RHENIUM
SILVER
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRANSITION ELEMENTS