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Stabilization of ε-iron carbide as high-temperature catalyst under realistic Fischer–Tropsch synthesis conditions
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Stabilization of ε-iron carbide as high-temperature catalyst under realistic Fischer–Tropsch synthesis conditions
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Journal Article
Stabilization of ε-iron carbide as high-temperature catalyst under realistic Fischer–Tropsch synthesis conditions
2020
Overview
The development of efficient catalysts for Fischer–Tropsch (FT) synthesis, a core reaction in the utilization of non-petroleum carbon resources to supply energy and chemicals, has attracted much recent attention. ε-Iron carbide (ε-Fe
2
C) was proposed as the most active iron phase for FT synthesis, but this phase is generally unstable under realistic FT reaction conditions (> 523 K). Here, we succeed in stabilizing pure-phase ε-Fe
2
C nanocrystals by confining them into graphene layers and obtain an iron-time yield of 1258 μmol
CO
g
Fe
−1
s
−1
under realistic FT synthesis conditions, one order of magnitude higher than that of the conventional carbon-supported Fe catalyst. The ε-Fe
2
C@graphene catalyst is stable at least for 400 h under high-temperature conditions. Density functional theory (DFT) calculations reveal the feasible formation of ε-Fe
2
C by carburization of α-Fe precursor through interfacial interactions of ε-Fe
2
C@graphene. This work provides a promising strategy to design highly active and stable Fe-based FT catalysts.
ε-Fe
2
C has been identified as the highly active phase for Fischer-Tropsch synthesis (FTS), but is stable only at low-temperature. Here, the authors show that ε-Fe
2
C phase can be stabilized even at ~ 573 K by being encapsulated inside graphene layers, and retains high activity in FTS.
