Wires encolsing a spiral element, their sets and use of such sets as a catalyst and/or in noble metal recovering processes

PCT No. PCT/FR93/00752 Sec. 371 Date Jan. 31, 1995 Sec. 102(e) Date Jan. 31, 1995 PCT Filed Jul. 22, 1993 PCT Pub. No. WO94/03665 PCT Pub. Date Feb. 17, 1994A wire comprising at least one helically wound wire element is disclosed. The helical winding consists of a platinoid or platinoid alloy wire (20). Also disclosed are assemblies of these wires (20) such as knitted materials, fabrics and felts, and the use of said assemblies as catalysers in the reaction for preparing nitric or cyanhydric acid, and to recover precious metals from these catalysers.