carbon monoxide and oxygen gas can be produced from carbon dioxide by introducing a supply of co 2 - containing gas to a co 2 permeable porous media . the co 2 permeates through the media to separate the co 2 from other species in the co 2 - containing gas supply . an oxygen - deficient ferrite material , disposed on a surface of the co 2 permeable porous media , contacts with the separated co 2 at decomposition reaction conditions to produce co and o 2 . corresponding devices for treating exhaust gases from a co 2 exhaust gas - producing apparatus are also provided .