2515. ------. [NATTA, G.]. [Methanol Catalyst.] Italian Patent 267,698, no date. Schmidt, J., Das Kohlenoxyd, Akad. Verlagsgesell., Leipzig, 1950, p. 208.

Before use, smithsonite is heated to 400°-450° at 300 atm.

See also German Patent 612,267 (abs. 2519) and United States Patent 1,815,677 (abs. 2518).