<abstract xmlns="http://www.w3.org/1999/xhtml">In the presented article, oxide forms of iron catalysts with the wustite structure and with a R = Fe2+/Fe3+ 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 Fe1−xO phase. The molar ratio of iron ions R = Fe2+/Fe3+ was determined by manganometric titration. The distribution of promoters in the structure of iron catalyst precursors with different R = Fe2+/Fe3+ ratio was determined by a selective etching method. The dependence of the lattice parameter <italic>ao</italic> value in the crystal structure Fe1−xO on the molar ratio R = Fe2+/Fe3+ was determined. On the basis of the determined dependence, R can easily be calculated in catalyst precursors of the wustite structure.</abstract>

In the presented article, oxide forms of iron catalysts with the wustite structure and with a R = Fe2+/Fe3+ 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 Fe1−xO phase. The molar ratio of iron ions R = Fe2+/Fe3+ was determined by manganometric titration. The distribution of promoters in the structure of iron catalyst precursors with different R = Fe2+/Fe3+ ratio was determined by a selective etching method. The dependence of the lattice parameter ao value in the crystal structure Fe1−xO on the molar ratio R = Fe2+/Fe3+ was determined. On the basis of the determined dependence, R can easily be calculated in catalyst precursors of the wustite structure.

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

Faculty of Chemical Technology and Engineering, Institute of Inorganic Chemical Technology and Environment Engineering

Polish Journal of Chemical Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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

In the presented article, oxide forms of iron catalysts with the wustite structure and with a R = Fe2+/Fe3+ molar ratio in the range from 3.78 to 8.16 were...

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

Published Online: Sep 26, 2019

Page range: 48 - 52

DOI: https://doi.org/10.2478/pjct-2019-0029

Keywords
wustite ammonia catalyst, XRD technique, manganometry, wustite lattice parameter

© 2019 Artur Jurkowski et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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

Published Online: Sep 26, 2019

Page range: 48 - 52

DOI: https://doi.org/10.2478/pjct-2019-0029

Keywordswustite ammonia catalyst, XRD technique, manganometry, wustite lattice parameter

© 2019 Artur Jurkowski et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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

Keywords
wustite ammonia catalyst, XRD technique, manganometry, wustite lattice parameter