This appears to be the synthetic jet fuel from Virent. It is made from light carbohydrates and other small organic molecules by their "Bioforming" process. This removes oxygen from the molecules by reaction in solution with hydrogen gas and a ruthenium catalyst. The resulting hydrocarbon molecules are then put through a reforming process where they are linked together and isomerized to get the right distribution of molecular weights.
I've followed this process for a while. It yields more energy than ordinary biomass approaches, since it can also incorporate the energy of the hydrogen input stream. This is good, because biomass has terrible efficiency at conversion of sunlight to fuel. No CO2 need be produced; the oxygen is carried away as water. One can think of the biomass as more of a carbon source than (just) an energy source. It also tolerates a wider variety of input molecules than enzyme-based approaches.
I've followed this process for a while. It yields more energy than ordinary biomass approaches, since it can also incorporate the energy of the hydrogen input stream. This is good, because biomass has terrible efficiency at conversion of sunlight to fuel. No CO2 need be produced; the oxygen is carried away as water. One can think of the biomass as more of a carbon source than (just) an energy source. It also tolerates a wider variety of input molecules than enzyme-based approaches.
https://www.virent.com/products/jet-fuel/
https://www.virent.com/technology/bioforming/