Man, fuck hetcat. You put extremely rare metals on special rocks in a very particular way just to burn something juuuuuust the right amount. Or un-burn it, I suppose. How does it work? Well, oxygen adatoms react with the substrate bound to a metal nanoparticle on its 10(-67) face following a formation of an oxygen vacancy-- jk, jk, it's actually all happening at a tellurium defect in your special rocks, you silly goose. Oh wait, nvm, it's actually iron contamination from manufacturing defects in the walls of your vessel. Git gud. Oh wait nvm it is actually catalyzed by your precious metal, but that metal needs to be slightly poisoned by lead and nickel from the radioactive decay of trace thorium from the welds and cobalt-60 in the steel, respectively. How could you have forgotten?

"But it works in my reactor!"