The
influence of different support surfaces and physical structures
on cobalt species and catalytic Fischer–Tropsch synthesis (FTS)
performance has been investigated by using silica or mesoporous carbon
as support. All the three catalysts Co/SBA-15, Co/SiO2,
and Co/CMK-3 behaved differently in the FTS test and showed characteristic
cobalt species. After calcination in argon, Co3O4 was prominent on both Co/SBA-15 and Co/SiO2 because of
the stronger metal–support interaction. However, the weaker
metal–support interaction on Co/CMK-3 coupled with the autoreduction
of cobalt oxide facilitated the formation of more CoO on the support
surface. On account of the higher reducibility and specific surface
area, Co/SBA-15 exhibited higher CO conversion in FTS than another
two as-synthesized catalysts. SBA-15 and CMK-3 possess well-ordered
channel structure which favors mass transport and diffusion while
diffusion inhibits hydrocarbon chain growth. The highest C5+ and C11–17 selectivities were observed over Co/SiO2 without regular channels, enabling enough intermediate residence
time for carbon chain growth.
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