2004. ------. [LARSON, A. T.] (E. I. du Pont de Nemours & Co.). Catalysts Suitable for Methanol Synthesis. United States Patent, 1,908,484, May 9, 1933; appl. filed Apr. 27, 1931. Chem. Abs., vol. 27, 1933, p. 3724.

In preparing a catalyst, a solution of a sexivalent Cr compound, such as chromic acid, is mixed with a soluble hydroxide, such as NH₄OH, and the salt of a heavy metal, the hydroxide of which is oxidizable by the sexivalent Cr, such as FeSO₄.

See also United States Patent 1,844,129 (abs. 2008) and 1,844,857 (abs. 2002).