"Representative energy-activated catalysts include metal oxides such as anatase, rutile or amorphous titanium dioxide (TiO2), zinc oxide (ZnO), tungsten trioxide (WO3), ruthenium dioxide (RuO2), iridium dioxide (IrO2), tin dioxide (SnO2), strontium titanate (SrTiO3), barium titanate (BaTiO3), tantalum oxide (Ta2O5), calcium titanate (CaTiO3), iron (III) oxide (Fe2O3), molybdenum trioxide (MoO3), ni" . . . . .