期刊
PROGRESS IN REACTION KINETICS AND MECHANISM
卷 44, 期 4, 页码 316-323出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1468678319862438
关键词
Fischer-Tropsch synthesis; cobalt catalyst; carbon nanotubes; particle size effect; crystal phase
The effects of metallic cobalt crystal phase on catalytic activity of cobalt catalysts in the Fischer- Tropsch synthesis were investigated in a continuous spinning basket reactor. The cobalt catalysts were prepared by impregnation of the cobalt active phase in a microemulsion system on multiwall carbon nanotube supports. A series of cobalt catalysts with different Co particle sizes was prepared by variation of the water-to-surfactant molar ratio from 2 to 12 in the microemulsion system. The X-ray diffraction results validate a complex composition of cobalt phases containing cobalt oxides and metallic cobalt with hexagonal close-packed and face-centered cubic phases. The results show that larger cobalt particles exhibit more face-centered cubic and less hexagonal close-packed metallic cobalt. The experimental results show that the catalysts with higher fractions of hexagonal close-packed phase exhibited higher conversion in the Fischer-Tropsch reaction.
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