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Ni-Fe, Co-Fe, and Co-Ni nanocomposites based on carbon nanotubes in the reaction of CO2 methanation
Ist Teil von
Molecular Crystals and Liquid Crystals, 2021-05, Vol.720 (1), p.38-46
Ort / Verlag
Philadelphia: Taylor & Francis
Erscheinungsjahr
2021
Quelle
Taylor & Francis
Beschreibungen/Notizen
For effective carbon dioxide (CO
2
) methanation, bimetallic Co
80
Ni
20
/CNTs, Ni
80
Fe
20
/CNTs, and Co
93
Fe
07
/CNTs nanocomposite catalysts, where subscript numbers indicate the metal content (wt.%), have been prepared with wet impregnation method, further thermal decomposition, and chemical reduction stages using carbon nanotubes (CNTs) as a carrier. The catalysts were characterized using TG, SEM-EDX, argon physisorption, and X-ray powder diffraction methods. The pristine nanotubes demonstrated a slight activity in CO
2
conversion due to the presence of small quantity of Ni. Among the tested nanocomposites the bimetallic Ni
80
Fe
20
/CNTs catalyst showed improved catalytic activity compared to Co
80
Ni
20
/CNTs and Co
93
Fe
07
/CNTs. The SEM-EDX analysis showed not uniform distribution of bimetallic aggregates on carbon nanotubes matrix for Ni
80
Fe
20
/CNTs and Co
93
Fe
07
/CNTs. However, this fact did not affect to catalytic properties of mentioned nanocomposites. Ni
80
Fe
20
/CNTs exhibited high activity in the CO
2
methanation with 88% of CH
4
yield at 350 °С unlike Co
93
Fe
07
/CNTs with 64% of CH
4
yield.