Just remember that you'll also get NOx (probably NO2) if you're putting air through it.
Ozone is very useful in some applications. Don't know how much so for refining, as it's so hard to make any substantial quantity and it only serves as an oxidizer. If you had a large enough generator, it would be great for a NOx scrubber.
Once upon a time, I collected ozone (and oxygen) in a liquid nitrogen cooled trap, looked like a dark blue ink. In a concentrated form, it's fearsome stuff!