Fischer-Tropsch FAQ
Fischer-Tropsch technology converts synthesis gas into liquid hydrocarbons used to produce sustainable aviation fuel, renewable diesel, and other synthetic fuels.
Answers for some of the most common questions about Fischer-Tropsch — process, feedstocks, fuel products, and FT’s role in sustainable fuel production.
How does Fischer-Tropsch work?
Fischer-Tropsch technology converts synthesis gas (a mixture of hydrogen and carbon monoxide) into liquid hydrocarbons using a catalyst.
During the reaction, hydrogen and carbon monoxide interact on the catalyst surface to form hydrocarbon chains. These hydrocarbons are then upgraded into fuel products such as sustainable aviation fuel, renewable diesel, and naphtha.
The simplified reaction is:
(2n + 1)H₂ + nCO → CnH(2n+2) + nH₂O
This process produces a range of hydrocarbons that can be refined into transportation fuels.
For the detailed reaction chemistry, see Fischer-Tropsch synthesis.
What is the Fischer-Tropsch process?
The FT process is a chemical reaction that converts synthesis gas (syngas) into liquid hydrocarbons such as jet fuel, diesel, naphtha, and waxes.
The process uses a catalyst (typically iron or cobalt-based) to facilitate the conversion at elevated temperatures and pressures. FT synthesis plays a foundational role in the production of synthetic fuels and chemicals from non-petroleum feedstocks like natural gas, biomass, biogas, municipal solid waste, or captured CO2.
Is Fischer-Tropsch carbon neutral?
Fischer-Tropsch technology itself is a chemical conversion process. The carbon intensity of the fuel depends on the feedstock used to produce synthesis gas.
When syngas is produced from fossil resources such as coal or natural gas, the resulting fuels have a higher carbon footprint.
When syngas is produced from sustainable feedstocks such as biomass, waste materials, or renewable hydrogen and captured CO₂, the resulting fuels can have significantly lower lifecycle emissions.
In some systems that integrate carbon capture, the overall fuel pathway can even achieve very low or negative lifecycle carbon intensity.
For SAF lifecycle emissions context, see Sustainable aviation fuel.
What is FT-SPK?
FT-SPK stands for Fischer-Tropsch Synthetic Paraffinic Kerosene, a synthetic aviation fuel blending component produced from Fischer-Tropsch hydrocarbons.
FT-SPK is produced by upgrading hydrocarbons generated through Fischer-Tropsch synthesis into jet-range fuel molecules.
It is one of several pathways approved for sustainable aviation fuel under the ASTM International D7566 aviation fuel specification.
FT-SPK is blended with conventional jet fuel to meet full aviation fuel standards.
For more detail, see Fischer-Tropsch synthetic paraffinic kerosene.
What feedstocks are used for SAF produced through Fischer-Tropsch?
Fischer-Tropsch SAF can be produced from a wide range of carbon-containing feedstocks once they are converted into synthesis gas.
Common feedstocks include:
- Biomass such as forestry residues or agricultural waste
- Municipal solid waste
- Biogas or landfill gas
- Natural gas
- Renewable hydrogen combined with captured CO₂ for e-fuels
These feedstocks are first converted into syngas before entering the Fischer-Tropsch synthesis step.
Feedstock flexibility is one of the reasons the Fischer-Tropsch pathway is widely studied for sustainable aviation fuel production.
Note that pyrolysis gas streams are not suitable for FT conversion.
For pathway context, see Syngas to SAF.
What is syngas made from?
Syngas, or synthesis gas, is a mixture of hydrogen (H₂) and carbon monoxide (CO) used as the input for Fischer-Tropsch synthesis.
Syngas can be produced from several processes including:
- Biomass gasification
- Waste gasification
- Natural gas reforming
- Biogas reforming
- Electrolysis combined with carbon capture
The ratio of hydrogen to carbon monoxide is an important factor in reactor performance and catalyst efficiency.
For more detail, see CO conversion explained.
Why is Fischer-Tropsch technology important for sustainable fuels?
Fischer-Tropsch technology enables the production of liquid hydrocarbon fuels from non-petroleum carbon sources.
Because the resulting fuels are hydrocarbons, they are compatible with existing:
- aircraft engines
- fuel pipelines
- storage systems
- refinery infrastructure
This compatibility allows synthetic fuels produced through the Fischer-Tropsch process to function as drop-in fuels for aviation and heavy transport.
For broader fuel pathways, see Renewable fuel technology.
How does FT differ from methanol-to-gasoline (MTG), methanol-to-jet (MTJ) or HEFA processes?
Fischer-Tropsch technology can be used across a wide range of feedstocks to produce a number of fuels and hydrocarbon products.
FT
Converts syngas into a range of hydrocarbons; feedstock flexible with multiple possible end products (FT-SPK, renewable diesel, naphtha, FT waxes, etc.)
MTG/MTJ
Converts methanol into gasoline-range/aviation range fuels; less mature technology that is not commercially proven and has not yet passed ASTM process requirements
HEFA
Uses fats, oils, and greases to produce hydroprocessed esters and fatty acids; dependent on lipid feedstocks, which are limited in supply and will not be enough to produce the anticipated required volume of renewable fuels
What are the primary applications of Fischer-Tropsch technology today?
FT technology is primarily used to convert syngas into liquid hydrocarbons
FT fluids are upgraded to final products like the following:
- Sustainable aviation fuel (SAF)
- Renewable diesel and naphtha
- Synthetic paraffins and waxes
- Specialty chemicals and lubricants
More common FAQs
Is Fischer-Tropsch technology new?
No. The Fischer-Tropsch process was first developed in the 1920s and has been used for decades in coal-to-liquids and gas-to-liquids fuel production.
Does Fischer-Tropsch produce jet fuel directly?
No. The process produces synthetic hydrocarbons that are later upgraded and refined into jet-range fuel fractions.
Can Fischer-Tropsch fuels replace fossil fuels?
Fischer-Tropsch fuels are chemically similar to petroleum-derived fuels and can serve as drop-in replacements when produced from sustainable feedstocks.
Why is syngas important in the FT process?
Syngas provides the hydrogen and carbon monoxide required for hydrocarbon formation during Fischer-Tropsch synthesis.