ON THE NATURE OF THE SO-CALLED IRON-GRAPHITE

Searching for the chemical and catalytic properties of iron-graphite, we reduced stage-1 FeCl3-graphite intercalation compounds (GIC) with K -naphthalenide/THF solutions, methyl-Li/THF solutions and hydrogen und er various conditions. In addition, stage-1 K-GIC and K(THF)(x)-GIC we re allowed to react with different iron compounds such as FeCl3, Fe(ac ac)(3), Fe(AcO)(2) and Fe(CO)(2)(NO)(2). The reduction of stage-1 FeCl 3-GIC by solutions resulted in graphite, three-dimensional iron platel ets, iron oxides and residual FeCl3-GIC encapsulated by carbon. In som e cases, intercalation of the reducing agent was observed. The samples reduced at high temperatures with hydrogen consist of graphite and th ree-dimensional iron platelets on the surface of the graphite flakes w ith a small amount of residual FeCl2-GIC. In contrast to the reduction of FeCl3-GIC, the reaction of K-GIC and K(THF)(x)-GIC with iron compo unds resulted in the formation of graphite, isotropic three-dimensiona l particles of metallic and oxidic iron supported on graphite, and res idual K-GIC. No lamellar two-dimensional Fe-graphite structure was fou nd in any of these samples. Copyright (C) 1997 Elsevier Science Ltd.