The catalyst is vanadium(V) oxide (vanadium pentoxide, V2O5)

It is a compound in the form V2O3 with vanadium of an oxidation state of (III). It is derived from reduction of vanadium pentoxide V2O5. It is mostly used as a catalyst of various reactions. Personally I've produced it by reducing vanadium pentoxide in sulfuric acid, heating for 30mins then creating a basic solution using sodium carbonate.

Manganese dioxide

Sulfuric acid

Vanadium pentoxide

Platinum

Palladium

vanadium pentoxide is used as an in oxidation catalysts to produce chemicals like sulfuric acid, maleic anhydride, phthalic anhydride and others. it is also used in catalsyts for pollution control applications (DeNOx and DeSOx catalysts for removing nitrogen oxides and suflur dioxide from flue gases in power stations and industrial plants). Vanadium pentoxide is also used in ceramic frits as a fluxing agent and pigment as well as UV absorbing glasses.

Vanadium pentoxide can be converted into ferrovaandium alloy for use in high strength low alloy steels, tool steels and high speed steels. it can also be converted into vanadium-aluminum alloys used in the production of titanium alloys for aerospace, industrial and recreational applications.

In 1998 South Africa controlled 89 percent of the vanadium pentoxide market, China held a 6 percent market share, and Russia had 4 percent of the market.