Process for the production of catalytic gas permeable nets and process for oxidizing ammonia

US5268157A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Siegfried Blass · Alzenau, DE
• Horst Duebler · Hanau, DE
• Thomas Stoll · Reutlingen, DE

Key dates

• Filing date: Mar 13, 1992
• Grant date: Dec 7, 1993
• Expiry date: Mar 13, 2012

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D10B2403/0242
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Wires of platinum containing 4 to 12% rhodium or 4 to 12% of palladium and rhodium (4 to 12% being in reference to the sum of palladium and rhodium and not the percent values for each individually) and wires of palladium containing 2 to 15% nickel or 2 to 15% copper or 2 to 15% of nickel and copper (2 to 15% being in reference to the sum of nickel and copper) and having a diameter of 50 to 120 .mu.m, a tensile strength of 900 to 1050 N/mm.sup.2 and an elastic limit of 0.5 to 3% are used for the knitting of round nets for use as catalysts in the oxidation of ammonia and as recovery nets for platinum metals. A flat knitting machine with a gauge of 3.63 to 1.81 mm is also used whereby the loop length is 2 to 6 mm and wherein the loop or width gauge corresponds with the knitting machine gauge so as to provide a loop width of 1.81 to 3.63 mm.