[Astrokel]

Hey all,

Any idea why Osmium Tetroxide (OsO₄) is a better catalyst than iron in the haber process?
I believe it is a heterogenous catalysis, any hint would be good enough.

And, my teacher said OsO₄ was used as a catalyst on buckminsterfullerene C₆₀, however i did some research online and found out OsO₄ was used as a confirmation of buckminsterfullerene and not as a catalyst. So probably my teacher is wrong?

Thanks for any help ! 

[Astrokel]

Since OsO₄ is a better catalyst, it provides an alternative route which has a lower Ea than Fe, but why? OsO₄ has a larger surface area for adsorption?

Any help would be good, thanks.