Do you suggest releasing a catalyst into atmosphere? It may be dangerous, people tend to release methane, kids sometimes injure themselves by "catalysing" reaction of methane with oxygen by a flame source just for fun of watching flame farts. It would be unfortunate if these flame farts happened spontaneously as a sort of an embarassing social accident.
I was thinking more of pumping air across a surface coated with a catalyst. Although a releasable catalyst would also be an interesting option. Not sure if flame farts would be a hindrance or a feature.
