FILL IN THE BLANKS the catalyst used to convert SO2 to SO3
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Adding an excess of oxygen to sulfur dioxide in the presence of the catalyst vanadium pentoxide at 450 °C and 1-2 atm. The sulfur trioxide formed is added to sulfuric acid which gives rise to oleum The oleum is then added to water to form sulfuric acid which is very concentrated.
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vanadium pentoxide
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