کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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62386 | 47637 | 2010 | 7 صفحه PDF | دانلود رایگان |
The role of the cobalt particle size distribution in the Fischer–Tropsch (FT) reaction for supported Co catalysts was investigated. Using TEM histogram analyses and activity measurements of carbon nanofiber-supported catalysts, the TOF of discrete Co particle sizes was calculated. It was found that cobalt particles of 4.7 ± 0.2 nm are the most active in the FT reaction (1 bar, 220 °C), and a narrow Co particle size distribution is clearly essential to arrive at the maximum activity. We have approached this requirement for maximum FT activity with an 18 wt.% Co/SiO2 catalyst prepared via impregnation, drying and calcination in NO/He. The more narrow Co particle size distribution (4.6 ± 0.8 nm) in Co/SiO2 led to an activity enhancement of ∼40% compared to Co/CNF (5.7 ± 1.4 nm), although some promoting effect of silica could not be excluded.
From TEM histograms and Fischer–Tropsch activities of Co/CNF catalysts, an optimum cobalt size with maximum activity was deduced. Based on this knowledge, a highly active Co/SiO2 catalyst with a narrow size distribution was synthesized.Figure optionsDownload high-quality image (107 K)Download as PowerPoint slide
Journal: Journal of Catalysis - Volume 270, Issue 1, 22 March 2010, Pages 146–152