Wires incorporating a helical component, assemblies thereof, and use of said assemblies as catalyst and/or to recover precious metals

The invention relates to a wire or wire comprising at least one coiled threadlike element in the form of a helix. The helix-shaped winding is made of a platinum wire or a platinum alloy. The invention also relates to the joining or splicing of these threads or wire, such as knitted fabrics, fabrics, filters. It also refers to the use of these junctions or joints, as a catalyst for the preparation reaction of nitric acid or hydrocyanic acid, and to recover the precious metals that come from these catalysts.