XRD研究表明 ,作为乙苯脱氢催化剂中的氧化铁活性组分 ,具有反式尖晶石结构的Fe3O4 比刚玉型的α Fe2O3 更易与钾助催化剂发生相互作用 :α Fe2O3-K2O需经850℃煅烧才能生成多铁酸钾 ,但在Fe3O4 -K2O体系中只需700℃即可.而且 ,钾还可抑制Fe3O4 被氧化为α Fe2O3 的进程 ,在空气中 ,Fe3O4 只需300℃煅烧即可明显转化为α Fe2O3 ,但同样的转化在Fe3O4 K2O体系中要经700℃煅烧才会明显地发生.实验结果表明 ,某种形态的多铁酸钾可能是催化剂中的储钾相. XRD studies show that, as an active component of iron oxide in the dehydrogenation of ethylbenzene dehydrogenation, Fe 3 O 4 with a trans-spinel structure is more likely to interact with a potassium promoter than a corundum-type α Fe 2 O 3: α Fe 2 O 3 -K 2 O undergoes 850 ° C. Calcined to generate potassium ferrite, but in the Fe3O4-K2O system only 700 ℃. And, potassium can inhibit the oxidation of Fe3O4 α Fe2O3 process, in the air, Fe3O4 only 300 ℃ calcination can be obvious To α Fe2O3, but the same conversion will obviously occur in Fe3O4 K2O system calcined at 700 ℃ .Experimental results show that some forms of potassium ferrate may be the potassium storage phase in the catalyst.