It's confusing, because at the top they say "This rockets don't use a catalyst" but further down the page they say "all this thanks to our proprietary formula of the penta metallic catalyst pack invented by Juan Manuel Lozano Gallegos from TAM."

(Side note: I saw that name and wondered where I had seen it before; turns out he's the guy Popular Science wrote about fifteen years ago for building his own peroxide-powered jetpack.)