Low temperature light off ammonia oxidation

A catalytic element comprising filaments consisting essentially of platinum, rhodium and optionally palladium, said filaments having a high surface area coating consisting essentially of platinum formed thereon, the surface area of said catalytic element exceeding 50 cm.sup.2 /g.

A method of forming a catalytic gauze element comprising forming a woven mesh consisting essentially of platinum, rhodium and optionally palladium, and spraying droplets comprising a thermally decomposable platinum compound dispersed in a volatile liquid onto said mesh and thereafter evaporating said volatile liquid and decomposing said thermally decomposable platinum compound to form a high surface area coating of platinum upon said mesh, the surface area of the resulting coated mesh being at least about 50 cm.sup.2 /g.

A method of forming a catalytic gauze element comprising forming a woven mesh consisting essentially of platinum, rhodium and optionally palladium, and depositing a thermally decomposable platinum compound dispersed in a volatile liquid onto said mesh and thereafter evaporating said volatile liquid and decomposing said thermally decomposable platinum compound to form a high surface area coating of platinum upon said mesh, the surface area of the resulting coated mesh being at least about 50 cm.sup.2 /g.