通过对乙苯脱氢制苯乙烯工业催化剂演变过程的分析，认为近年催化剂组成已经历由fE-k-Cr系列向fE-k-CE系列以及由高钾含量向低钾含量的过渡。催化剂制备工艺也有诸多改进，颗粒形状由传统圆柱形向齿轮柱形及三叶柱形等异型颗粒演变。关于催化活性本质的研究渐趋活跃，多数研究者认为活性相是k2fE2O4，钾流失是催化剂在正常操作条件下逐渐老化的根本原因。ccording to the evolution of the commercial catalysts for dehydrogenation of ethylbenzene to styrene,it was deduced that the basic composition of these catalysts was transformed from Fe-K-Cr to Fe-K-Ce system and the potassium content in the catalysts was greatly decreased since the end of 1980′s.The production technics of the catalysts also had some improvements and the ethylbenzene dehydrogenation catalysts with ribbed or trilobate shapes appeared in the market recently.Studies focusing on the nature of the active phase of these catalysts and on the mechanism of catalyst aging were taken more and more attentions.It was concluded by most of the researchers that K_2Fe_2O_4 was the active phase of the catalysts and potassium migration from the catalysts was the main reason of the catalyst aging
