<p>Pyridine is an important and typical model compound for studying fuel-nitrogen conversion mechanisms during the combustion process. Blending a part of ammonia during the coal combustion process could effectively reduce CO₂ emissions. The co-oxidation kinetics of pyridine and ammonia were investigated in an atmospheric pressure jet-stirred reactor at temperatures between 770 and 1100 K with the equivalence ratios of 0.05 and 2. Pyridine, ammonia, and several major oxidation products were quantitatively measured by two gas chromatographs and a Fourier transform infrared spectrometer. The pyridine LTO 3.0 kinetic model was used to predict the pyridine-ammonia conversion characteristics. The current model could provide relatively good predictions of pyridine conversion under most conditions, including pyridine-ammonia co-oxidation under fuel-rich conditions, but the predictions for NH₃ under fuel-rich conditions and pyridine under fuel-lean conditions still require improvement. Blended ammonia promotes pyridine consumption under fuel-lean conditions and inhibits pyridine consumption under fuel-rich conditions. The results of this work could help better understand the coal-ammonia interaction during the co-firing process of coal and ammonia.</p>