乙烯氧气法氧氯化反应中铜催化剂的研究

用微分固定床和沸腾床反应器考查了在乙烯氧气法氧氯化制二氯乙烷反应中,浸渍法制备的铜催化剂的反应活性及其应用的可能性,并与共沉淀法制备的铜催化剂进行了比较。用x射线衍射分析,程序升温还原和乙烯脉冲反应探讨了乙烯氧氯化催化剂的活性相结构与反应机理。

STUOY ON COPPER CATALYST USED IN OXYGEN BASED OXYCHLORINATION OF ETHYLENE

In this paper, the reaction activity of impregnated microspheroidal CuCl₂/Al₂O₃ catalyst using in oxygen based ethylene oxychlorination to prepare ethylene dichloride was studied. XRD, TPR and pulse reaction technique proved that the impregnated catalyst has identical active phase of CuCl₂ with commercial coprecipitated catalyst,though the copper present in the later at first is in the form of Cu₂(OH)₃Cl, but it changes into CuCl₂ by HCl which is presented in the reacting gas as the oxychlorina-tion takes place. The copper content and its state of distribution on the surface of γ-Al₂O₃ car-rier appear important in the activity development of the catalyst. They also show a serious influence on the fluidity in fluidized bed reaction. The impregnated catalyst is simple to prepare and its cost is low. Catalyst with 9%(wt) copper content may be used instead of the coprecipitated catalyst having 13% (wt) of copper.