941. ------. [HARTER, H.] [Catalyst for Ammonia Synthesis.] German Patent 647,720, July 10, 1937 (Cl. 12k-3). Chem. Abs., vol. 31, 1937, p. 8133.

Patent Abstracts

941. ------. [HARTER, H.] [Catalyst for Ammonia Synthesis.] German Patent 647,720, July 10, 1937 (Cl. 12k-3). Chem. Abs., vol. 31, 1937, p. 8133.

Catalyst consists of Fe, Fe₂O₃, difficulty reducible metal oxides, and the corresponding metals. The presence of the metals is ensured by reducing their oxides by adding reducing metals, such as Ca, Mg, or Al, to the fused mass and stirring. Thus, freshly precipitated Fe(OH)₂ is intimately mixed with nitrates of U, Th, and Zr, dried, and heated to glowing in a current of H₂. The resulting mass of Fe, Fe₂O₃, and difficulty reducible oxides of U, Th, and Zr is given and addition of Al, Ca, and Mg well mixed and fused. The oxides of U, Th, and Zr are partly reduced by the Al, Ca, and Mg to insure the presence of some metallic U, Th, and Zr. The product is used as the catalyst for NH₃ synthesis. Gives other examples. Small amounts of Mo and W may be added with the Al.