METHOD FOR MAKING GAS PERMEABLE WEB OF NOBLE METALS UTILIZABLE FOR CATALYTIC PROCESSES

摘要

For knitting round nets for use as catalysts in ammonia combustion and as recovery nets for platinum metals, wires of platinum with 4 to 12 % of rhodium or 4 to 12 % of palladium and rhodium and wires of palladium with 2 to 15 % of nickel or 2 to 15 % of copper or 2 to 15 % of nickel and copper are used, which must have a diameter from 50 to 120 mu m, a tensile strength from 900 to 1050 N/mm<2> and an elongation limit from 0.5 to 3 %. In addition, a flat-knitting machine having a pitch between 3.63 mm and 1.81 mm is required, the mesh length having to be between 2 and 6 mm.