US scientists just demonstrated a process that converts atmospheric CO2 directly into jet fuel using concentrated sunlight as the only energy input — a breakthrough that could make aviation not merely carbon neutral but carbon negative by consuming more CO2 than aircraft burn.
Researchers at the National Renewable Energy Laboratory in Colorado used a thermochemical reactor heated by concentrated solar energy to 1,500 degrees Celsius to split CO2 molecules into carbon monoxide and oxygen through a cerium oxide catalyst cycle, then combined the carbon monoxide with hydrogen from solar-powered water splitting to produce synthetic jet fuel through Fischer-Tropsch synthesis. The complete process from atmospheric CO2 to aviation-grade kerosene uses only sunlight, water, and air as inputs — no fossil feedstocks, no rare materials, and no external energy beyond sunshine. The synthetic fuel burns identically to conventional jet fuel in existing aircraft engines with no modification required.
Solar-to-fuel efficiency reached 5.2 percent in laboratory demonstrations — meaning 5.2 percent of incident solar energy ends up stored as chemical energy in the fuel product — sufficient for commercial viability when combined with free solar land in desert regions adjacent to airports. The Mojave Desert alone receives enough solar energy annually to produce all jet fuel consumed by US aviation if 3 percent of its area used this process.
United Airlines and Boeing have jointly funded a $400 million pilot plant targeting 10 million liters of annual solar jet fuel production by 2027, with commercial scale deployment planned for Southwest desert airports from 2030.
Source: National Renewable Energy Laboratory, US Department of Energy, Nature Energy, 2025
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