Temperature-programmed reaction of pre-adsorbed CO on iron catalyst: new experimental evidence for competition model

Synthesis of Iron-Carbide Nanoparticles: Identification of the Active Phase and Mechanism of Fe-Based Fischer–Tropsch Synthesis

“…[11][12][13][14][15] To address this issue, various types of metal or metal carbides were prepared. [16][17][18][19][20][21][22] Metallic iron, [23][24] and various phases of iron carbides had all been claimed to be active. 4,6,[25][26][27][28][29][30][31][32][33][34][35][36][37][38] The complication for FTS comes also from the complexity of the reaction network itself, 4 h before it was cooled down to room temperature.…”

A DFT study towards dynamic structures of iron and iron carbide and their effects on the activity of the Fischer–Tropsch process

“…Therefore, the exact structural composition of the active phase and the role of these phases are still controversial due to the limitations of in situ characterization of the catalyst. 2,14 Claims of catalytic activity of Fe 3 O 4 , [31][32][33] pure Fe, 16,34,35 and iron carbides 26,36,37 in FTS are all found in previous studies. From the Mössbauer emission spectroscopy (MES), Niemantsverdriet et al 34 found that the carbides can only be observed in coexistence with pure Fe or just aer it disappeared.…”

Theoretical study of crystal phase effect in heterogeneous catalysis

“…The identification of the active phase has long been controversial because of the prevention by complicated composition and in situ characterization of the catalysts. For example, metallic Fe, Fe 2.2 C, Fe 7 C 3 , Fe 5 C 2 had all been claimed as the active phase responsible for FTS. It remains an open question which is the active phase for FTS, i.e., Fe or Fe carbides.…”