Question

What catalysts are used to manufacture sulfuric acid and nitric acid?

Answer 1

Here is a site for HNO3. The site lists Pt and Rh as catalysts but Fe oxides and Ni are also used.
(Broken Link Removed)

This sits lists vanadium oxide as a catalyst for the contact process of producing H2SO4. There may be others.
http://www.ausetute.com.au/sulfacid.html