Abstract: The Fe2O3-K2O catalyst for ethylbenzene dehydrogenation was prepared by a mixing method. The structure and reduction properties of the catalyst calcined at different temperatures were characterized byX-raydiffraction, Mssbauer spectroscopy, mercury intrusion porosimetry, temperature-programmed reduction, and thermogravimetric analysis-differential thermal analysis. The results showed that, with the increase of calcination temperature, the specific surface area of the catalyst was decreased, but its average pore diameter increased. The calcination temperature also had effect on the structure of K2Fe22O34, the precursor of active phase of the catalyst, leading to the decrease in the content of Fe3+on tetrahedral site and the increase in the content of Fe3+on octahedral site, and the catalyst became more reducible. The induction period for the catalyst stationary activity was decreased with the increase in calcination temperature and too high calcination temperature would deteriorate the catalyst stability

Key words: calcination temperature, ethylbenzene, dehydrogenation, styrene, iron oxide, potassium oxide