乙苯脱氢催化剂中CaO助催化作用的穆斯堡尔谱学表征

Abstract

穆斯堡尔谱学研究表明，在k2O-fE2O3体系中引入CAO促进k2O与fE2O3之间的相互作用，降低k1＋XfE11O17的生成温度.而且，CAO的引入还降低了在k2O-fE2O3体系中产生“α-fEOOH“物种所必须的k2O含量（由约17%降低为约8%）.在乙苯脱氢反应条件下所发生的fE3＋被还原为fE2＋的过程，亦被钙的存在所延缓.

The Promotions of CaO in the catalysts of ethylbenzene dehydrogenation to styrene were investigated by M6ssbauer studies, which showed that the interaction between K2O and Fe2O3 was enhanced and the formation temperature of K1+xFe11O17 was depressed by the introduction of CaO into K2O-Fe2O3 system.Moreover, the necessary content of K2O in K2O-Fe2O3 system for the formation of "a-FeOOH" species was reduced from about 17% to 8% by the introduction of CaO.We also found that the process of reduction from Fe3+ to Fe2+ in the Fe2O3 based catalysts under the condition of ethylbenzene dehydrogenation was retarded by the presence of Ca in the catalysts.