Japanese researchers have developed a coconut‑oil‑based aviation biofuel that was tested in a small jet engine. The experiment, reported by the Good News Network, showed that the new kerosene additive can reduce harmful emissions without significantly compromising engine efficiency. The study was carried out by scientists at Osaka Metropolitan University, who proposed producing fuel from coconut oil using solvents. They added 10 % acetone and either methanol or ethanol to the base material. The process can be carried out at room temperature and atmospheric pressure, which lowers energy consumption and the overall carbon footprint. Glycerin is produced as a by‑product, and the reagents can be reused. During testing, the researchers blended the biofuel with conventional jet kerosene in ratios ranging from 10 % to 50 %. The thermal efficiency of the blends was almost identical to that of standard fuel, although fuel consumption increased slightly because the plant component has a lower heating value. The most striking result was a reduction in unburnt hydrocarbons in the exhaust gases. At a 50 % biofuel content, the concentration of these hydrocarbons fell by 5 % to 40 %, depending on engine operating mode. The effect was most pronounced at low engine revolutions per minute, typical of idle conditions. Carbon dioxide and nitrogen‑oxide levels remained essentially unchanged. Despite these encouraging findings, the technology is not yet ready for commercial use. Adding the coconut‑oil fuel increased toxic carbon‑monoxide emissions, which could pose a risk to airport personnel. Experts say that the drawback must be addressed and that the fuel’s long‑term stability during storage needs to be tested before it can be considered for aviation applications.
Article source: Magyar Hirlap | Image credit: Magyar Hirlap