Engineering360: "Vehicular CO2 emissions slashed with onboard capture and conversion scheme"

"...a truck consuming 1 kg of conventional fuel could produce 3 kg of liquid CO₂ without incurring any energy penalty."

This is difficult to believe. How is this possible?

The chemical formula of fuel is approximately CH2 (that is chains and rings of carbon atoms, each with 2 hydrogens). The molecular mass of each carbon unit is 14.

The molecular mass of CO2 is 44. The carbon has gained mass by combining with oxygen from the air to make CO2. Simple chemistry.

Perhaps I should have made my statement more difficult to misunderstand. It is not the mass of the reactant or resultant that I find difficult to believe. What is difficult to believe is the part about not incurring an energy penalty.

The idea that there would be no energy penalty for producing CO2 as a high pressure liquid vs. just exhausting it to atmosphere is difficult to believe.

Simple thermodynamics.