Engine tests for GTL and Hexanol blends with B5 in application to a EURO 5 Diesel engine

A study has been performed with two fuel blends, both allowing the principal usage of up to 33 vol. % CO2 neutral fuel in a EURO 5 engine. The intention has been to understand, if those fuels can be applied as drop in fuels without any calibration changes and still meeting the emission limits the engine has been certified to. This would offer a significant CO2 reduction potential with the engine fleet, already in the market. The vehicle emission tests showed, that for both fuel blends the emission are very close to those, measured with standard B5 fuel and well within the limits. Also the tank-to-wheel CO2 emissions were close or even slightly reduced, thus offering the full well-to-wheel CO2 reduction potential of the fuel blends. However, the stationary measurement on the engine test bench revealed the risk that under non-cycle conditions the NOx emissions are increased, in case no calibration adjustment will be done. So far both fuel blends have not been tested with regard to wear and compatibility with the fuel hoses and engine oil.