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In the presented article, oxide forms of iron catalysts with the wustite structure and with a R = Fe 2+ /Fe 3+  molar ratio in the range from 3.78 to 8.16 were investigated. The chemical composition of the tested catalyst precursors was determined by inductively coupled plasma optical emission spectrometry (ICP-OES). The X-ray diffraction (XRD) technique was used to determine the phase composition and location of reflections characteristic of the Fe 1−x O phase. The molar ratio of iron ions R = Fe 2+ /Fe 3+  was determined by manganometric titration. The distribution of promoters in the structure of iron catalyst precursors with different R = Fe 2+ /Fe 3+  ratio was determined by a selective etching method. The dependence of the lattice parameter  a o value in the crystal structure Fe 1−x O on the molar ratio R = Fe 2+ /Fe 3+  was determined. On the basis of the determined dependence, R can easily be calculated in catalyst precursors of the wustite structure.

polish journal of chemical technology

Determination of Fe<sup>2+</sup>/Fe<sup>3+</sup> mole ratio based on the change of precursor lattice parameters of wustite based iron catalysts for the ammonia synthesis

Determination of Fe2+/Fe3+ mole ratio based on the change of precursor lattice parameters of wustite based iron catalysts for the ammonia synthesis

Determination of Fe²⁺/Fe³⁺ mole ratio based on the change of precursor lattice parameters of wustite based iron catalysts for the ammonia synthesis