Ultra-low emission combustion of diesel-coconut biodiesel fuels by a mixture temperature-controlled combustion mode

•A novel, Mixture Temperature-Controlled (MTC) combustion concept was used.•The cold atomizing jet leads to MTC combustion with low luminosity.•<13 mg/Nm3 NOX and <4 mg/Nm3 CO emission at 15% O2 was sustained in MTC mode.•B100 over diesel fuel is leading to 46% lower NOX emission on average in MTC mode.•OH* of straight flames correlates well with NOX and flue gas temperature.