Mark,
Approach it from a slightly different perspective. Think of the gas you want
out, what are it's constituents? Is it for making an IC engine run, hydrogen
for a turbine or kiln? What % H, CO, and other gasses do you want?
You can reform CO2 and H2O with enough added heat and in theory, recover
it. But does it give you the product out (gas composition) that you desire?
Skip to the liquids... alcohols... and notice about double the hydrogen in
relation to the CO. How would you get there? It has to be the water gas shift
plus carbon, in sufficient quantity to make CO and not CO2.
In your CO2 example, it would seem to need more carbon (plus heat). Adding C
plus CO2 would be a strategy for increasing CO then, but would do nothing to
increase hydrogen.
Regards,
Toby
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