Our CATs are fed hydrocarbon (fuel, in our case, AdBlue in trucks, some Mazda passenger vehicles and likely many more) which identifies the device as a three-way catalyst (present in most vehicles after the early 1980s). I neglected to mention the CO-CO2 conversion, thanks for pointing that out. One of my sources is Wikipedia, but I'll also try pull some info from the service manuals when I return home and have my full data library at hand (I'm still at Bathurst, and only have my laptop which doesn't have enough storage for all the manuals etc that I use for reference).
