Among $V_{2} O_{5}$ and $P t$ , which is a better catalyst for formation of $S O_{3}$ from $S O_{2}$ by contact process? Why?

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Solution

The contact process is the current method of producing sulfuric acid in the high concentrations needed for industrial processes. Platinum used to be the catalyst for this reaction; however, as it is susceptible to reacting with arsenic impurities in the sulfur feedstock, vanadium( $V$ ) oxide ( $V_{2} O_{5}$ ) is now preferred.
Vanadium pentoxide is used in different, industrial processes as catalyst: In the contact process it serves for the oxidation of ${S O}_{2}$ to ${S O}_{3}$ with oxygen at $440 ℃$ . Also, it cannot be deactivated easily.

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