I was thinking about a way to separate some if not all exhaust gases from cars?

Question

so I decided to see if anyone asked about this already and someone did, but mine is somewhat different. This is what they asked, "Is there any way to convert carbon dioxide into oxygen in car exhaust engines without using plants?
I'm doing a little research on the car exhaust engine... 
I know there's already a catalytic converter in the car exhaust system which converts carbon monoxide into carbon dioxide, but how do we convert that into oxygen artificially?" 

My question is, why we can't use the electric engines in cars to produce the energy to do this conversion, we know that electric engines can produce a lot of power and some of the energy required for the engine can be regained due to braking while we use cars, so can we use the batteries they use in electric cars for this, and can we use them electric engines in the first place to do this.

Answer

You are talking about combining chemistry, physics, electrics, and ... something you are going to invent. I'll cut this short: Energy is not a physical unit. It is a philosophical concept and an accounting technique used to analyze mechanical and chemical exchanges. In nuclear physics it is defined as a color of light, in biology it is a synonym for metabolism, and in public utilities they say energy when they mean connectivity. Speaking about chemistry, you want to go from a low energy compound, CO2, to a high energy state, O2 and C. Get that process figured out and the rest is fairly easy. I am told that submarines use a process to do that. Maybe you can find a reference to that. (They used to use a chemical to absorb the CO2 and then added oxygen from a tank. But now they have an actual recycling process.)

I was thinking about a way to separate some if not all exhaust gases from cars?

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