2303. MOLSTAD, M. C., AND DODGE, B. F. Zinc Oxide-Chromium Oxide Catalysts for Methanol Synthesis. Ind. Eng. Chem., vol. 27, 1935, pp. 134-140; Chem. Abs., vol. 29, 1935, p. 2313.
Mixtures of ZnO and Cr oxide, made by NH3 precipitation from a solution of the mixed nitrates, are active, rugged MeOH catalysts. The most active mixture in a short test is Zn75Cr25, in agreement with other investigators that excess Zn is necessary. Catalysts containing more Cr increase in activity during tests, and the improvement is accelerated by temperatures up to 100° above maximum-activity temperature so that the best catalyst for long service is Zn50Cr50, which produces almost pure MeOH and is unaltered by long use at temperatures considerably above the normal operating temperature.
MOMEN, S. A. See abs. 2446.