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CO2 To Fuel, Closing the "Carbon Loop"
leprasmurf writes "Inhabitat has posted an article detailing a recent announcement of a process to turn CO2 into fuel. The process, which used to be considered too energy inefficient, uses a multi-step, low pressure, and low temperature biocatalyst to break the CO2 into 'basic hydrocarbon building blocks.'"
Funnily enough there was a program on TV here in the UK last night about producing electricity from CO2 and water.
Two guys in the New Mexico desert had a huge mirror array the focussed the sun into a really intense beam (they could melt steel with it) and directed it into a giant furnace, which I think got to 2400 degrees C, but could have been 4200. This heated the air inside to separate the CO2 which they could then use to create hydrocarbons.
This all worked on a huge scale of course, but they also had a smaller version that could produce 2-3 gallons of fuel a day that was about the size of a pretty young small tree.
So I agree that the energy has to come from somewhere in order to separate the CO2, but who says that energy can't come from solar power eventually? Of course this is more expensive now, but it'll be getting cheaper all the time as oil gets more expensive.
Last February, Los Alamos announced they had a process that converts CO2 to gasoline. The associated white paper proposed using a nuclear reactor to provide the requisite energy to drive the process. They went as far as to estimate the costs of their process and pegged the cost of gasoline at $4.30 gallon at the pump. A significant fraction of their cost estimate was credit costs to finance the plant. They figured 50 cents for every dollar sales given the billions they'd need to start the process. Without factoring the credit costs (which they could do if they could convince enough investors to take an equity position instead of borrowing the capital) they estimated their process produced gasoline at $1.40 per gallon.
You cannot hide from the chemistry.
The energy to do this MUST come from *SOMEWHERE*.
Well, duh. That's not the point. The attractiveness of such a process is that we have a world built around hydrocarbons, we're running out of fuel, the climate is taking offense at all the CO2 in the atmosphere and there is a giant fission reactor 1AU from here which constantly delivers a huge amount of energy to us (but we haven't yet found a way to store that energy). If you could use the energy from the sun to turn CO2 back into usable fuel, that would solve quite a lot of problems in one go.
Indeed, they are a counted as a weed here in Australia... they ruin creeks and rivers by upsetting the balance of the ecosystem (dominate over natural grasses and trees).
So yes, GP needs to check their facts first.