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Iron-based FBC additives with a different length of the organic stabilizing ligands: undecylenic acid (C11) and oleic acid (C18) were synthesized. A physicochemical characterization of the materials structure and morphology was performed by means of Raman spectroscopy, electron diffraction and TEM imaging. It was found that the reactivity of iron-based fuel borne catalysts depends on the length of the organic disperser and the size of the formed hematite nanoparticles. Reactivity tests performed in soot oxidation reaction both at a laboratory scale and in a commercial light oil burner revealed that the C11 stabilizer is more efficient than the C18 one in decreasing the emission of CO and soot particles.