Mössbauer investigation of supported Fe and FeNi catalysts: II. Carbides formed Fischer-Tropsch synthesis
作者： GB Raupp , WN Delgass
DOI: 10.1016/0021-9517(79)90274-4
关键词: Nickel 、 Chemistry 、 Catalysis 、 Carbide 、 Compounds of carbon 、 Particle 、 Mössbauer spectroscopy 、 Chemical engineering 、 Inorganic chemistry 、 Chemical reaction 、 Fischer–Tropsch process
摘要: Abstract Mossbauer characterization of iron catalysts following Fischer-Tropsch reaction at 523 °K reveals significant differences in carbide phases formed depending on particle, support, and alloying with Ni. Small particles silica favor formation the unstable ϵ′ ϵ carbides. Large small magnesia form χ as is normal for bulk unpromoted iron. Alloying nickel approximately equimolar amounts completely prevents carbides our conditions, but some evidence exists surface carbon. The complexity metastable Fe/FexC/C system further exemplified a series spectra recorded intermediate times. These data demonstrate time dependency dependence rate average metal particle size.
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