Iron Catalysts Supported On Carbon Nanotubes
For Fischer–Tropsch Synthesis:
Effect Of Pore Size
Author(s)
R. M. Malek Abbaslou, J. Soltan, S. Sigurdson & A. K. Dalai
Abstract
In this report, the effects of pore diameter and structure of iron catalysts
supported on carbon nanotubes (CNTs) on Fischer–Tropsch (FT) reaction rates
and product selectivities are presented. Two types of CNTs with different
average pore sizes (12 and 63 nm) were prepared. The CNTs were chosen in a
way to have comparable surface areas so as to eliminate the effects of different
surface areas. The iron catalysts (the narrow pore catalyst denoted Fe/np-CNT
and wide pore catalyst denoted Fe/wp-CNT) were prepared using incipient
wetness impregnation method and characterized by ICP, BET, XRD, TPR, SEM
and TEM analyses. The TEM and XRD analysis showed that the iron oxide
particles on the Fe/wp-CNT (17 nm) were larger than those on Fe/np-CNT
sample (11 nm). TPR analyses of the catalysts showed that the degree of
reduction of the Fe/np-CNT catalyst was 17% higher compared to that of the
Fe/wp-CNT catalyst. For the FT reactions, it was found that the activity of the
np-CNT catalyst (%CO conversion of 31) was much higher than that of the wp-
CNT catalyst (%CO conversion of 11). Also, the Fe/wp-CNT was more selective
toward lighter hydrocarbons with a methane selectivity of 41% whereas, the
methane selectivity of the np-CNT catalyst was 14%. It can be concluded that
the deposition of the metal particles on the CNT with narrow pore size (in the
range of larger than 10 nm) results in more active and selective catalyst due to
higher degree of reduction and higher metal dispersion.
Keywords: Fischer–Tropsch synthesis, iron, carbon nanotubes, pore size.
Keywords
Fischer–Tropsch synthesis, iron, carbon nanotubes, pore size
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