prov:value
| - Among the useful metal catalytic components are those selected from components of tin compounds, the rare earth metals, certain other catalytic components and mixtures thereof, in particular catalysts containing gold, silver, copper, vanadium, chromium, cobalt molybdenum, tungsten, zinc, indium, the platinum group metals, i.e., platinum, palladium, and rhodium, iron, nickel, manganese, cesium, tit
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