South Korea claims breakthrough technology that turns air into high-quality gasoline
South Korea unveils a process that converts CO2 into synthetic gasoline. We examine its thermodynamic viability and the scientific skepticism.
English · Original discussion in Spanish · Published
South Korea claims to turn air into gasoline: reality or thermodynamic mirage?
South Korean researchers claim to have developed a process that captures CO₂ and hydrogen from the air to produce 50 kg of synthetic gasoline per day, according to a study published in ACS Sustainable Chemistry & Engineering. The immediate question: how much energy does it take? Because the laws of thermodynamics are unforgiving: to break apart CO₂ and H₂O, you must put in at least as much energy as you later get from burning the fuel. The paper does not detail the energy balance, which raises every red flag.
The hydrogen problem
Atmospheric hydrogen is practically nonexistent; it escapes into space. The only way to obtain it is by electrolysis of water, a process that consumes electricity. If that electricity comes from renewables, the whole chain could be carbon neutral, but the energy cost multiplies. Moreover, the concentration of CO₂ in the air is a mere 400 ppm, so capturing it requires moving enormous volumes of air, making the process even more expensive.
Efficiency and alternatives
Synthetic fuels are nothing new: they have been produced with renewable energy for decades, but their efficiency hovers around 20-30% (from electricity to fuel and back to motion), compared with 70-80% for a battery electric car. For this technology to compete, it would need a nearly free source of energy. For now, there is no data to support that.
Meanwhile, the scientific community is still waiting for concrete efficiency figures. History is full of promising announcements that evaporated once thermodynamics was applied. This one will probably meet the same fate.
Related debates in the forum
South Korean researchers claim to have developed a process that captures CO₂ and hydrogen from the air to produce 50 kg of synthetic gasoline per day, according to a study published in ACS Sustainable Chemistry & Engineering. The immediate question: how much energy does it take? Because the laws of thermodynamics are unforgiving: to break apart CO₂ and H₂O, you must put in at least as much energy as you later get from burning the fuel. The paper does not detail the energy balance, which raises every red flag.
The hydrogen problem
Atmospheric hydrogen is practically nonexistent; it escapes into space. The only way to obtain it is by electrolysis of water, a process that consumes electricity. If that electricity comes from renewables, the whole chain could be carbon neutral, but the energy cost multiplies. Moreover, the concentration of CO₂ in the air is a mere 400 ppm, so capturing it requires moving enormous volumes of air, making the process even more expensive.
Efficiency and alternatives
Synthetic fuels are nothing new: they have been produced with renewable energy for decades, but their efficiency hovers around 20-30% (from electricity to fuel and back to motion), compared with 70-80% for a battery electric car. For this technology to compete, it would need a nearly free source of energy. For now, there is no data to support that.
Meanwhile, the scientific community is still waiting for concrete efficiency figures. History is full of promising announcements that evaporated once thermodynamics was applied. This one will probably meet the same fate.
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Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (18 replies).
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