SELECTIVITY OF GAS-SOLID CATALYTIC REACTION

SYNTHESIS OF ETHYLENE OXIDE

抄録

A new model, in which both effectiveness factors of micropore and macropore are taken into consideration, has been proposed for the analysis of the selectivity of the intermediate product in a consecutive gas-solid catalytic reaction. This model is applied to the synthesis of ethylene oxide with silver catalyst, on which many papers had been presented without regard to the effectiveness factors of the catalyst used. Many experimental results in those papers are studied and analyzed by this model. From these analyses it may be concluded that: (1) this catalyst system is well simulated by tha model, (2) the reaction scheme is the simple consecutive one C₂H₄→C₂H₄O→CO, CO₂ with k₁/k₂ about 16, and (3) tha ratio of the effectiveness factors of micropore are regarded as constant in this system, and so tha main factors that dominate the selectivity of ethylene oxide are tha ratio of the effectiveness factors of macropore and the conversion of ethylene.