与机械混合法相比,用KOH水溶液浸渍法制成的K_2O-Fe_2O_3催化剂性能较佳。负载型多元催化剂的性能与C-64I相近。SEM、XPS和EDAX证实,经使用后,上述负载型多元催化剂表面形态明显改变,表面铁/钾原子比上升。连续升温XRD证实,在乙苯脱氢通常所采用的温度区间,载于表面的KOH会迅速和氧化铁相互作用生成K_2Fe_2O_4。本文认为K_3Fe_2O_4可能是活性相并据此对实验结果作出较为合理的解释。 Compared with the mechanical mixing method, the K_2O-Fe_2O_3 catalyst prepared by impregnation with KOH aqueous solution has better performance. The performance of supported multicomponent catalysts is similar to C-64I. SEM, XPS and EDAX confirmed that the surface morphology of the supported multicomponent catalyst changed obviously and the surface iron / potassium atomic ratio increased after use. Continuous heating XRD confirmed that in the ethylbenzene dehydrogenation temperature range usually used in the surface of KOH will quickly interact with iron oxide to generate K 2 Fe 2 O 4. In this paper, K_3Fe_2O_4 is considered as the active phase and the experimental results are explained reasonably.