کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10239382 | 46068 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Silica aerogel supported catalysts for Fischer-Tropsch synthesis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Cobalt catalysts supported on silica aerogel have been prepared using sol-gel chemistry followed by drying under supercritical ethanol conditions. Three different loadings of cobalt were synthesized: 2, 6, and 10% by weight. Transmission electron micrographs indicate that the metallic cobalt exists as discrete particles 50-70Â nm in diameter for the 2 and 6% loadings. The 10% catalyst shows long needles of cobalt. BET and BJH measurements indicate that the catalysts retain the silica aerogel properties of high surface area (â¼800Â m2/g), large pore volume (â¼5Â cm3/g), and an average pore diameter in the mesoporous regime (â¼25Â nm). The catalysts were evaluated for Fischer-Tropsch activity in a laboratory-scale packed bed reactor. All three catalysts were active with the 10% Co catalyst achieving more than 20% CO conversion which corresponds to a rate of 1.53Â g CO per g-cat per hour. The catalysts were selective for the C10+ hydrocarbons with more than 50% of the carbon contained within this fraction. A significant portion of the C9-C15 hydrocarbon product was observed as 1-olefins which reflects the enhanced mass transport within the very porous aerogel support.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 278, Issue 2, 10 January 2005, Pages 233-238
Journal: Applied Catalysis A: General - Volume 278, Issue 2, 10 January 2005, Pages 233-238
نویسندگان
Brian C. Dunn, Paul Cole, Daniel Covington, Matthew C. Webster, Ronald J. Pugmire, Richard D. Ernst, Edward M. Eyring, Naresh Shah, Gerald P. Huffman,