TY JOUR TI Formation of the active state of the promoted iron oxide catalyst for dehydrogenation KW potassium polyferrite KW hematite KW promoted iron oxide catalyst KW ferrite system KW phase diagram JO From Chemistry Towards Technology Step-By-Step AU Dvoretsky, N.V. AU Anikanova, L.G. AU Malysheva, Z.G. AU Sudzilovskaya, T.N. PY 2021 IS 2 PB Yaroslavl State Technical University