That is the Bergius process.
Zinc and this element's tetrathiol complexed with ammonium can be used to prevent copper uptake in the treatment of Wilson's disease. In addition to cerium, Seebach's staining reagent contains phosphoacids of this element, and although it's not tungsten, compounds of this element are used to catalyze the first step of a process which involves the hydrogenation of high-volatile bituminous coal to form synthetic liquid hydrocarbons. That is the Bergius process. Solution B of Masson's trichrome also contains this transition metal. Alkylidenes of this metal are part of a catalyst system developed by Schrock for (*) olefin metathesis, but they were later replaced by ruthenium-based Grubbs's catalyst. Along with iron, this metal atom is in the catalytic site of the enzyme xanthine oxidase. In a cluster containing iron and sometimes vanadium, this element helps to fix nitrogen in bacteria. For 10 points, name this transition metal notably found in the active sites of nitrogenase enzymes.
Zinc and this element's tetrathiol complexed with ammonium can be used to prevent copper uptake in the treatment of Wilson's disease.
Molybdenum [or Mo]