CATALYTIC ELEMENT FOR AMMONIA CONVERSION Russian patent published in 1999 - IPC

FIELD: production of nitric acid and related compounds. SUBSTANCE: invention relates to honeycomb catalytic elements for ammonia conversion that can be used as second- step catalyst in production of nitric acid, hydrocyanic acid, and hydroxylamine sulfate. Catalytic element is made in the form of honeycomb canals-containing layer consisting of separate prisms tightly joined with each other by their lateral faces. According to invention, diameter of prism base and its height constitute, respectively, 4 to 100 and 2 to 75 equivalent diameters of honeycomb canal. Invention is also distinguished by that prism base is shaped as tri-, tetra-, or hexagon and in that element is made from material composed of, %: Fe₂O₃ 92 and Cr₂O₃ 8; or Fe₂O₃ 89.5, ZrO₂ 5, MgO 5, and ZrBaO 0.5; or Fe₂O₃ 79, Al₂O₃ 20, and MgO 1; or Fe₂O₃ 79.7, Al₂O₃ 30, and V₂O₅ 0.3; or perovskite 90, Al₂O₃ 8, and SiO₂ 2. EFFECT: increased strength and lifetime of catalyst. 3 cl, 8 dwg