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Catalytic Properties of Ni-Fe Systems in the Reaction of CO₂ Methanation at Atmospheric Pressure

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Meshkini-Far R., Dyachenko A., Gaidai S., Bieda O., Filonenko M., Ischenko O.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
1088-1090
EN
Catalytic activity, phase composition, and morphology of binary Ni-Fe metallic systems in CO₂ hydrogenation were investigated. High methane yield was detected in the region of high Ni content, except the sample with 75% of Ni which has shown a sharp drop in activity. By means of scanning electron microscopy-energy dispersive X-ray and X-ray diffraction methods the differences in surface structuring of active (Ni₈₀Fe₂₀) and inactive (Ni₇₅Fe₂₅) catalysts were revealed. High methane yield for the former might be explained by defective porous superficial layer of catalyst grains, whereby for the latter the specific surface is diminished due to sintering.
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Structure and Catalytic Properties of Co-Fe Systems in the Reaction of CO₂ Methanation

100%
Zhludenko M., Dyachenko A., Bieda O., Gaidai S., Filonenko M., Ischenko O.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 4
1084-1087
EN
The properties of Fe-Co catalysts in the reaction of CO₂ hydrogenation were investigated. Samples with high cobalt concentrations have shown higher activity. Morphology of the obtained catalysts was observed by using scanning electron microscopy and the elemental composition of surface of the catalysts was determined by scanning electron microscopy-energy dispersive X-ray method. Energy dispersive X-ray analysis showed that metal distribution is not homogeneous with various metal ratio in selected points of the surface for the Fe-rich less active samples, whereas for the Co-rich samples with higher activity metals are homogeneously distributed, which is possibly connected to the formation of single phase.
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