In this work, CuFeMnO4 (copper iron manganese oxide) oxygen carrier was characterized using differential scanning calorimetry/thermogravimetric analysis (TGA), in situ X-ray diffraction, and scanning electron microscopy-energy dispersive X-ray spectroscopy (EDS) to gain a clear elucidation of the chemical looping combustion reactions with H-2 which is a component of synthesis gas. A reaction model which best described the experimental TGA reaction data was selected from the analysis. Intrinsic rate of reaction parameters obtained from the study could be used for designing a reactor for scale-up. A model with combined contributions from nucleation and growth model and dimensional phase boundary model was found to exhibit the best correlation with the experimental data. The analysis provided validation of intrinsic reaction rates and other rate parameters.