<p>This article aims to investigate the effects of using an alternative fuel on the emissions of carbon dioxide (CO₂) and carbon monoxide (CO) in a reactive flow spraying inside a model combustor. The study highlights the trade-offs between CO₂ and CO emissions, encouraging further investigation into alternative fuels, considering their environmental impact. The bio-synthetic fuel comprises Jatropha Bio-Synthetic Paraffinic Kerosene (JSPK) blended with Jet-A at five different weight ratios to make the alternative fuels. The two-phase flow of the fuel and air mixture is assessed by the Eulerian-Lagrangian approach. The realizable κ-ε model is employed to model the turbulent flow. The discrete ordinates method is applied to model radiative heat transfer, and the steady flamelet combustion model is utilized to model combustion. The distributions of mean mixture fraction and mole fractions of CO₂ and CO at the combustion chamber outlet are presented. Results reveal that variations in fuel properties affect the emission of pollutants since adding JSPK increases the emission rate of the mean mixture fraction and the mole fraction of CO and decreases the mole fraction of CO₂ at the combustor outlet. Also, employing a weight ratio of 80% Jet-A with 20% JSPK leads to achieving the lowest mean mixture fraction and mole fraction of CO with a maximum reduction of 25% relative to utilizing only the base fuel. In addition, the lowest amount of CO₂ is obtained for 70% Jet-A / 30% JSPK, which is about 15% less than other weight ratios.</p>