Ярославль, Ярославская область, Россия
Ярославль, Ярославская область, Россия
Ярославль, Ярославская область, Россия
Ярославль, Ярославская область, Россия
УДК 546.723 Трехвалентное железо
It was found that for K-β"Fe2O3 the maximum probability of realization of the active centers representing a cluster consisting of potassium ions, iron 3+ and 2+, and oxygen. The ability to self-reproduction and self-regulation in the reaction medium is an integral attribute of K-β"Fe2O3 as the main catalytically active component. This type of catalyst can be called a "catalyst with a permanently migrating promoter". Polyferrite serves as a conductor of the alkaline promoter. The monoferrite concentrated in the depth of the catalyst granules, for example, on the inner surface of closed pores can be a source of potassium. Polyferrites are solid electrolytes with a cationic type of conductivity and provide not only the delivery of the promoter to a required location through channels embedded in the crystal structure, but also its regular placement in the composition of active clusters. K-β"Fe2O3 is able to place the alloying additives in its structure. Only in this case, extremely small amounts of injected agent can greatly change the properties of the system. The rearrangement is not chaotic, if the K-β"Fe2O3 surface is chemically dispersed in the reaction medium to form a catalytically active short-lived substance - a nanoheterogeneous mixture of monoferrite and magnetite.
potassium polyferrite, hematite, promoted iron oxide catalyst, ferrite system, phase diagram
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