Molybdenum, tungsten, vanadium, cobalt, nickel spent catalyst
Bismuth Oxide, Cobalt Oxide, Nickel Oxide, Indium Oxide, Tin Oxide, Tellurium Oxide, Antimony Oxide, Cadmium Oxide, Ferric Oxide, Manganese Oxide, Silicon Oxide, Molybdenum Oxide, Antimony Tin Oxide