摘要
The effect of calcination condition on the cobalt species and Fischer-Tropsch synthesis （FTS） was studied. It was found that higher calcination temperature resulted in decreased FTS activities because CNTs were consumed by oxidation in air at temperature higher than 230 ℃. Cobalt species went through transformation from Co304 to metallic Co in Ar by autoreduction at temperature over 500℃. The autoreduction route might be Co3O4→CoO→C0 or Co3O4→Co2C→Co. Reduction at temperature higher than 500 ℃ also resulted in decreased FTS activities due to the methanation of CNTs in hydrogen.
The effect of calcination condition on the cobalt species and Fischer-Tropsch synthesis （FTS） was studied. It was found that higher calcination temperature resulted in decreased FTS activities because CNTs were consumed by oxidation in air at temperature higher than 230 ℃. Cobalt species went through transformation from Co304 to metallic Co in Ar by autoreduction at temperature over 500℃. The autoreduction route might be Co3O4→CoO→C0 or Co3O4→Co2C→Co. Reduction at temperature higher than 500 ℃ also resulted in decreased FTS activities due to the methanation of CNTs in hydrogen.
基金
supported by the National Natural Science Foundation of China (21076151)
New Century Excellent Talents in University Chinese Ministry of Education (NCET-06-0239)
the Programme of Introducing Talents of Discipline to Universities (B06006)
