We
report a stable and efficient Fe–Co catalyst derived
from N-coordinated Co single-atom carbon (FeK/Co–NC) for CO2 conversion to long-chain hydrocarbons with a C5+ selectivity of up to 42.4% at a conversion of 51.7% at 300 °C
and 2.5 MPa. Its performance remained stable over a time-on-stream
of 100 h. The FeK/Co–NC catalyst exhibited less methane selectivity
(21.6%) than the coimpregnated FeCoK/NC catalyst (33.8%), which is
attributed to the Co–NC support, efficiently inducing Fe–Co
alloy formation by atomically supplying Co into Fe nanoparticles.
The Fe–Co alloy of the FeK/Co–NC catalyst remained stable
in both carburized and oxide forms during the reaction. Density functional
theory suggests that Fe–Co mixed oxides accelerate oxygen removal
during the reverse water–gas shift, whereas Fe–Co mixed
carbides promote chain growth to suppress methane formation during
Fischer–Tropsch synthesis. Our combined experimental and theoretical
study demonstrates the promoting effect of the Fe–Co atomic
alloy structure for CO2 hydrogenation.
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