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OwnerNikola Anastasijevic, Dietrich Werner +4inventors
InventorsNikola Anastasijevic, Dietrich Werner, Marcus Runkel, Stefan Laibach, Egon Winkler, Achim Hollnagel
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A gas mixture comprising molecular oxygen and 15 to 60 vol-% SO2 flows through a first catalyst layer which contains a catalyst containing vanadium pentoxide, and directly subsequently through a second catalyst layer which contains a catalyst containing iron. With an inlet temperature of 350 to 600° C., the gas mixture is introduced into the first catalyst layer which contains a granular V2O5 catalyst and 20 to 80 wt-% catalytically inactive inert material. Directly subsequently, the gas mixture is introduced into the second catalyst layer with a temperature of 500 to 750° C. Preferably, the catalyst of the second catalyst layer contains 3 to 30 wt-% arsenic oxide. There is produced an SO3-containing product gas with a volume ratio of SO2: SO3 of not more than 0.1.
A process for the catalytic conversion of a gas mixture which contains molecular oxygen and 15 to 60 vol-% SO2 at temperatures in the range from 350 to 800° C. when flowing through a first catalyst layer which contains a catalyst containing vanadium pentoxide, and directly subsequently through a second catalyst layer which contains a catalyst containing iron, for producing an SO3-containing product gas with a volume ratio of SO2:SO3 of not more than 0.1, characterized in that the gas mixture is introduced into the first catalyst layer with an inlet temperature of 350 to 600° C., that the first catalyst layer contains granular V2O5 catalyst and 20 to 80 wt-% catalytically inactive inert material, and that the gas mixture is introduced into the second catalyst layer with a temperature of 500 to 750° C.
Dependencies are inferred from the claim text.