CATALYST FOR THE OXIDATION OF SO2 TO SO3

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A catalyst for the oxidation of SO2 to SO3, a process for producing it and its use in a process for the oxidation of SO2 to SO3 are provided. The catalyst comprises an active substance comprising vanadium, alkali metal compounds and sulfate applied to a support comprising naturally occurring diatomaceous earths, wherein the support comprises at least two different naturally occurring uncalcined diatomaceous earths which differ in terms of the structure type of the siliceous algae from which they are derived.