One method for producing this compound used nitrogen dioxide as a catalyst and involved a highly exothermic  oxidation; later versions of that method used a Glover tower to recover the nitrogen oxides and concentrate the  product.
One method for producing this compound used nitrogen dioxide as a catalyst and involved a highly exothermic  oxidation; later versions of that method used a Glover tower to recover the nitrogen oxides and concentrate the  product. That method, the lead chamber process, has been largely supplanted by a process that uses a vanadium  oxide catalyst. Its "fuming" variety is also known as oleum, and it is found in the clouds of Venus. This diprotic  acid is also found in car batteries and acid rain. Historically known as "oil of vitriol," this is, for 10 points, what strong acid with formula H2SO4?
One method for producing this compound used nitrogen dioxide as a catalyst and involved a highly exothermic  oxidation; later versions of that method used a Glover tower to recover the nitrogen oxides and concentrate the  product.
{Sulfuric acid} [accept {H2SO4} before mentioned]