Question
Promoter used in contact process.

Answer

Potassium oxide

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$\begin{array}{cc}
\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{}\\
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\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{}\\
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