Why vanadium pentoxide is best catalyst used in cantact process
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Answer: In the contact process it serves for the oxidation of SO2 to SO3 with oxygen at 440°C. Besides it is used in the oxidation of ethanol to ethanale and in the production of phthalic anydride, polyamide, oxalic acid and further products.
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Platinum used to be the catalyst for contact process; however, as it is susceptible to reacting with arsenic impurities in the sulfur feedstock, vanadium oxide (V2O5) is now preferred...
platinum is a more efficient catalyst than vanadium pentoxide. But it is more expensive and it also gets poisoned by impurities like arsenic oxide....
Thus, vanadium pentaoxide is preferred over that....
hope this helps u...✌️
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