Experimental and modeling of autoignition of gaseous hydrocarbon fuels in the presence of H2 and C2H4

•The focus of the investigation is to understand the kinetic interactions of H2 and C2H4 with other gaseous fuel components that are formed in combustion systems due to the pyrolysis of long-chained hydrocarbon fuels.•Ignition delay time measurements obtained in the current work will add value to the literature database for future model validation efforts, especially for binary mixtures which lack data in the literature.•Model improvements are made for low-temperature kinetics of C3H6 ignition based on the experimental measurements. The model was validated for high- and low-temperature conditions.•Uncertainty analysis is used to quantify model uncertainty in predicting ignition delay times, and to identify reactions that need further study to reduce the overall model uncertainty.