Coconut oil could fuel future jet engines

August 23, 2026

Researchers at Osaka Metropolitan University have developed a coconut oil-based aviation biofuel that can be blended with conventional Jet A-1 while maintaining strong engine efficiency. The fuel is produced using a low-energy cosolvent technique that operates at room temperature and atmospheric pressure, potentially making biofuel manufacturing simpler and less energy-intensive.

The research explored how coconut-derived fuels perform when mixed with Jet A-1, one of the most widely used aviation fuels worldwide. Scientists tested several fuel blends in a small turbojet engine, measuring fuel consumption, thermal efficiency and exhaust emissions.

Low-energy method produces coconut biofuel

Coconut oil is emerging as a potential feedstock for sustainable aviation fuels because its fatty acids have carbon-chain lengths that are relatively close to those required for jet-fuel hydrocarbons. This characteristic could help reduce the amount of processing needed to turn coconut oil into a usable aviation fuel component.

The Osaka Metropolitan University research team developed a cosolvent-based production process in which coconut oil extracts are combined with acetone and alcohol. Unlike some conventional biofuel production techniques that require elevated temperatures or pressures, the process works under ambient conditions.

Operating at room temperature and normal atmospheric pressure could lower energy requirements during production while also helping maintain the quality and purity of the resulting fuel.

Researchers produced two different coconut-derived biofuels. Fatty acid methyl ester (FAME) was created using methanol, while fatty acid ethyl ester (FAEE) was produced with ethanol.

Coconut biofuel tested with jet a-1

To evaluate whether the fuels could work in aviation applications, researchers blended varying concentrations of FAME and FAEE with conventional Jet A-1.

The mixtures were then used to power a small turbojet engine under controlled conditions. Scientists examined several important performance indicators, including fuel consumption and thermal efficiency.

Testing showed that fuel consumption rose as the percentage of coconut-derived biofuel in the blend increased. According to the researchers, the increase was primarily associated with differences between the heating values of the biofuels and conventional jet fuel.

However, the engine's thermal efficiency remained comparable to operation with Jet A-1. The findings suggest that adding coconut-derived fuel does not necessarily cause a significant decline in the engine's ability to convert fuel energy into useful power.

This is an important consideration for the development of alternative aviation fuels, as new fuels must meet demanding performance requirements while also being compatible with existing engine technologies.

Hydrocarbon emissions decline with higher biofuel blends

The researchers also analyzed how the coconut biofuel mixtures affected engine emissions.

One of the most notable findings was a decline in hydrocarbon emissions as the proportion of biofuel increased. Meanwhile, carbon dioxide and nitrogen oxide emissions showed no significant changes during the tests.

The results indicate that coconut-derived aviation fuel could potentially reduce certain exhaust pollutants without substantially compromising engine performance.

Dr. Huynh Phuong Uyen Nguyen of Osaka Metropolitan University's Graduate School of Sustainable System Sciences said the experiments demonstrated that the fuel blends could be used in existing gas turbine engines without major reductions in efficiency or performance and without increasing emissions.

The ability to use biofuel blends in existing engines could be particularly valuable for aviation because replacing or extensively modifying aircraft propulsion systems would significantly increase the cost and complexity of adopting alternative fuels.

Waste coconuts could become aviation fuel feedstock

Beyond engine performance, researchers see another potential environmental advantage: discarded coconuts could become a source of renewable fuel.

The technology could be particularly relevant to Southeast Asia and other major coconut-producing regions. A substantial share of harvested coconuts reportedly fails to meet commercial quality requirements and is discarded.

Instead of becoming agricultural waste, these rejected coconuts could potentially serve as feedstock for local biofuel production. Turning agricultural residues and unwanted crops into fuel could create additional value from existing resources while reducing dependence on conventional petroleum-based fuels.

Local production could also strengthen energy security in regions that are vulnerable to disruptions in imported fuel supplies.

Researchers aim for 100% coconut-based biofuel

Although the current research focused primarily on blends with conventional Jet A-1, the scientists ultimately hope to develop technology capable of operating aircraft engines entirely on biofuel.

Dr. Shinichiro Ogawa said future research will focus on improving fuel-consumption performance and developing systems capable of running engines on 100% biofuel.

Before coconut-derived aviation fuel can move toward widespread commercial use, several additional challenges will need to be addressed. The researchers plan to study long-term fuel storage stability, compatibility with engine and fuel-system materials, and the overall environmental footprint of the technology.

Life-cycle assessments will also be important for determining whether coconut-derived fuels can deliver meaningful greenhouse gas reductions once feedstock cultivation, processing, transportation and fuel production are taken into account.

If these challenges can be overcome, coconut waste could provide another pathway toward lower-impact aviation fuels while giving coconut-producing regions a new use for agricultural resources that might otherwise be discarded.