In this process, oxygen and sulfur dioxide are reacted, and the reaction product is dissolved in a concentrated solution to form oleum, H2S2O7, which can be reacted with water to give the final product.
The initial reagents in this process must be ultrapure to prevent poisoning of the vanadium oxide catalyst.  In this process, oxygen and sulfur dioxide are reacted, and the reaction product is dissolved in a concentrated solution to form oleum, H2S2O7, which can be reacted with water to give the final product. Developed in 1831 by a British vinegar merchant, it can produce a much more concentrated product than the older lead chamber process.  So named due to the interaction sulfur dioxide and oxygen have with the catalyst, this is, FTP, what major industrial process that produces sulfuric acid?
The initial reagents in this process must be ultrapure to prevent poisoning of the vanadium oxide catalyst.  
the contact process