Investigation of the mechanism of influence of cerium additives on the properties of iron-potassium system – the active component of hydrocarbons dehydrogenation catalysts (2)

Abstract

Properties of model systems Fe2O3–K2O and Fe2O3–K2O–CeO2 with a weight ratio 80:20 and 50:20:30, respectively, were studied by methods of thermal, magnetic, and X-ray analysis of variance, and the low-temperature nitrogen adsorption. There is revealed that then interaction of iron oxide with potassium carbonate take place the successive formation of the mono-and poly ferritic phase is going. It is suggested that the activity of iron-potassium catalyst is proportional to content of the surface mono ferritic phase. Found that the introduction of cerium into iron-potassium system leads to a redistribution of mono- and poly ferrits of potassium in the ferrite phase, namely to increasing of the mono ferritic phase share. Consequently, the introduction of cerium promotes the activity of the catalyst system. The results of this study will be used to develop a new iron-potassium catalysts with enhanced catalytic activity in the dehydrogenation of isoamylenes to isoprene.