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[-] humanspiral@lemmy.ca 1 points 2 days ago

can be done right there in the same facility as the Fischer-Tropsch reactions

That happens to be fossil fuel propaganda for e-fuels. The process is a heat based industrial scale, where fossil fuel supply chains are already developed, and H2 "extraction" is part of a continuous heat process, and ample CO (often co2 processed into CO) generation is part of the process. Furthermore these are net 0 fuels which are not good enough, or as good as green fuels. A reasonable carbon tax is $300/ton. Direct air capture can reach costs below this amount, and compete with green transition, but only if the CO2 is permanently sequestered or solidified. 0 credit would be given if e-fuels CO2/CO content comes from fossil fuels or air capture.

Again, H2 or Ammonia, are the right long term fuels. They can be synthesized without the heat-based industrial processes, or at least use H2 for the heat. H2 economy means smaller scale production distributed closer to customers.

[-] grue@lemmy.world 1 points 2 days ago

That happens to be fossil fuel propaganda for e-fuels.

No, it doesn't, because it's my own original thought and I'm not a fossil fuel propaganist.

I'm not talking about fucking cracking natural gas; I'm talking about building an electrolysis plant running on renewable electricity next to a former refinery doing all the hydrocarbon chemistry that has been adaptively reused to make synthetic fuel. The hydrogen is not supposed to be coming from petroleum!

Furthermore these are net 0 fuels which are not good enough, or as good as green fuels.

On the contrary, carbon neutral is absolutely good enough. Why the hell wouldn't it be?!

Again, H2 or Ammonia, are the right long term fuels.

Again, you're wrong about H~2~ because throwing out all the liquid fuel infrastructure we already have to switch to the most difficult-to-handle choice short of something hypergolic is just fundamentally stupid.

I don't know anything about ammonia; maybe it really is the right solution. It's kind of a different topic, though. Do you want to start talking about that instead?

[-] humanspiral@lemmy.ca 1 points 2 days ago

carbon neutral is absolutely good enough. Why the hell wouldn’t it be?!

H2 (or green electricity) is carbon negative when it displaces FF use. unnecessary and expensive efuels are not. DAC is/can be carbon negative. But sequestering the CO2 is less expense than combining it with H2 into an efuel that negates the capture value of DAC. A carbon tax and dividend is a better social mechanism for cost (including climate cost) reductions even when investing in DAC reduces the tax collections and dividends.

throwing out all the liquid fuel infrastructure

A misunderstanding, that stems from extreme volume of disinformation, is that energy transition means "first we have to nuke all infrastructure from orbit" strawman, that is used to protect the status quo. Instead, less then no new dead ender energy infrastructure investments should be made during transition, and then one day, fairly far away, old inefficient machinery will not be worth repairing, even though access to fuel will continue existing for a very long time, and no matter how inneficient it is, a machine will be sold for something greater than 0 to someone who needs it for backup, or because it is cheap.

Just because you can't hold H2 in your existing beer mug container doesn't mean H2 handling is not a largely solved problem. Ammonia is higher energy density than liquid H2 with propane container handling solutions.

this post was submitted on 01 Oct 2025
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