Kinetics of catalytic oxidation of ethylene: Fixed-bed and fluidized-bed studies

Catalytic oxidation of ethylene was investigated with catalysts containing 5% Ag (Type A) and 12% Ag moderated with 0.002% Se and 0.3% Ba O 2 (Type B). Fixed-bed studies showed that selectivity is independent of inlet gas composition and total conversion and that its value is over 0.68 for temperatu...

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Bibliographic Details
Published in:The Chemical engineering journal 1985-12, Vol.31 (3), p.145-151
Main Authors: DOGU, G, SOZEN, Z. Z
Format: Article
Language:English
Subjects:
Applied sciences
Chemical industry and chemicals
Exact sciences and technology
Industrial chemicals
Organic industry
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Summary:Catalytic oxidation of ethylene was investigated with catalysts containing 5% Ag (Type A) and 12% Ag moderated with 0.002% Se and 0.3% Ba O 2 (Type B). Fixed-bed studies showed that selectivity is independent of inlet gas composition and total conversion and that its value is over 0.68 for temperatures up to 260 °C (Type A) and up to 290 °C (Type B). The rates of conversion of ethylene to ethylene oxide and to CO 2 are both of half order with respect to ethylene concentration and first order with respect to oxygen concentration. Fluidized-bed studies showed that both the velocity and concentration dependence of total fractional conversion of ethylene and the selectivity of the reaction agreed well with the theoretical predictions of a model in which the number of transfer units and the values of the bubble phase volume fraction were evaluated from the bubbling-bed model while plug flow and perfectly mixed flow were assumed in the bubble and dense phases respectively.
ISSN:0300-9467
1873-5541
DOI:10.1016/0300-9467(85)80055-1