397. COMMERCIAL MINERA S. A. [Active Iron Oxide Catalyst.] Spanish Patent 192,978, Apr. 26, 1951. Chem. Abs., vol. 47, 1953, p. 1309.

Patent Abstracts

Oligiste (Fe₂O₃). In the form of scales, is mechanically broken up until the black original material acquires a dark-brown color. The material in this form is a much more active catalyst. Other agents may be added, and heat treatment may be used to improve the catalytic action.