2731. PYZEL, E. (Shell Development Co.). Catalytic Converter Suitable for Use in the Synthesis of Ammonia, and Methanol. United States Patent 2,006,078, June 25, 1935. Chem. Abs., vol. 29, 1935, p. 5316.

Apparatus suitable for use under high pressure comprises a converter shell containing at least 3 alternate layers of coarsely divided uniform catalyst and finely divided uniform catalyst of the same chemical composition arranged transverse to the gas flow through the converter and in contact with each other.