In addition to Fenton's reagent, this was the central element complexing with two dienyl rings in the first observed metallocene.
One reagent containing this element along with hydrogen peroxide generates radical hydroxide groups and is used in the treatment of waste-water. In addition to Fenton's reagent, this was the central element complexing with two dienyl rings in the first observed metallocene. It can be isolated from its carbonate ore which is called siderite, and Bosch modified the Haber process by using the oxide of this element as a catalyst. For 10 points, identify this element which can alternatively be called ferrum.
One reagent containing this element along with hydrogen peroxide generates radical hydroxide groups and is used in the treatment of waste-water.
{iron} [or {Fe;} accept ferrum until mentioned]