All you do is cluster the corn-oil units around biodiesel plants that use another money-saving GreenShift innovation: a "continuous base catalystreaction" system that relies on a "proprietary process intensification and advanced separation technologies"--whatever those are.
The CO2 reduction takes place on a metal catalyst at the opposite side of nitride semiconductor photo-electrode.(See Fig. 1) The metal catalyst plays an important role in selecting and accelerating the reaction.