3 years ago

Fischer–Tropsch synthesis using Co and Co-Ru bifunctional nanocatalyst supported on carbon nanotube prepared via chemical reduction method

Fischer–Tropsch synthesis using Co and Co-Ru bifunctional nanocatalyst supported on carbon nanotube prepared via chemical reduction method
We used a chemical reduction method to synthesize the catalysts of cobalt (Co) and cobalt-ruthenium (Co-Ru) bifunctional supported on carbon nanotubes (CNTs) for Fischer–Tropsch synthesis (FTS) in a fixed-bed reactor. These Co-Ru/CNTs catalysts were synthesized with various weight proportions of Ru/Co (0.1 to 0.4 wt%) with keeping a fixed amount of cobalt (10 wt%). Moreover, for comparison purpose, CNTs supported Co- and Co (Ru)-based catalysts at same loading as the above catalysts were prepared through impregnation method. We characterize the present catalysts through the various techniques such as Energy–dispersive X-ray (EDX), Transmission Electron Microscopy (TEM), Brunauer–Emmett–Teller (BET), Hydrogen-Temperature-Programmed Reduction (H2-TPR), Hydrogen-Temperature-Programmed Desorption (H2-TPD) and O2 titration. Thus using the chemical reduction method, a narrow particle size distribution was obtained so that the small cobalt particles were confined inside the CNTs. The Co-based catalyst prepared by impregnation was compared with the Co-Ru catalysts at the same loading. The results demonstrated that the use of chemical reduction method led to decrease the average Co oxide cluster size to 8.7 nm so that the reduction enhanced about 24% and stabilized an earlier time at the stream. Among the prepared catalysts, the results indicated that the Co-Ru/CNTs catalysts demonstrated high catalytic activity with the highest long-chain hydrocarbons (C5 +), selectivity up to 74.76%, which was higher than those we obtained by the Co-Ru/γ-Al2O3 (61.20%), Co/CNTs (43.68%) and Co/γ-Al2O3 (37.69%). At the same time, comparing with those catalyst synthesized by impregnation, the use of chemical reduction led to enhancement of the C5 + selectivity from 59.30% to 68.83% and increment in FTS rate about 11% for the Co-Ru/CNTs catalyst.

Publisher URL: www.sciencedirect.com/science

DOI: S2095495617306216

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