PATENTS

      1546.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  [Regenerating Catalysts.]  German Patent Appl. I 72,810, OZ 13,565, filed July 22, 1942 (Cl. IV d-12 o).  FIAT Reel  168, frames 6,956-6,959; PB 68,444; TOM Reel 17, item 32, frames 890-893; Meyer Transl. PC-S-II, Fischer-Tropsch, vol. 2, chap. 94, 1948, p. 55

            In rebuilding uses, so-called fused Fe catalysts, preferably after the removal of conversion products still held by them, by treatment with a solvent or at raised temperature with H₂ they are exposed to small amounts of O₂ or to another oxidizing gas until they no longer become heated in air and then are fused in a stream of O₂.