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.