کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
41010 | 45874 | 2012 | 8 صفحه PDF | دانلود رایگان |

Fischer–Tropsch synthesis (493 K, 0.62 MPa CO, 1.24 MPa H2) has been performed over monometallic and bimetallic Co and/or Fe clusters deposited on mesoporous silicas (HMS and SBA-15). Catalysts have been prepared by incipient wetness impregnation and characterized by N2 adsorption–desorption isotherms, X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), and transmission electron microscopy (TEM).HMS supported Co-Fe catalyst showed the highest activity and C5+ hydrocarbon selectivity, while Co-Fe/SBA-15 catalyst revealed the highest selectivity to alcohols. Both bimetallic catalysts were more active toward the C2–C4 hydrocarbon fraction, with an enhancement in the selectivity to C2, C3 and 1-C4 olefins. Both bimetallic catalysts showed greater chain growth probability values than the monometallic iron based catalysts although their performance in catalytic tests were more close to the iron catalyst.
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► Bimetallic catalysts Co-Fe/HMS and Co-Fe/SBA-15 were used for Fischer–Tropsch synthesis.
► They promoted a high alcohols formation, being ethanol the main oxygenated product.
► Among the olefins both Co-Fe catalysts were more selective toward the propylene.
► The Co-Fe/HMS showed higher selectivity to C5+ and alcohols than Fe/HMS catalyst.
► The Co-Fe/SBA-15 exhibited a higher selectivity to C2–C4 hydrocarbons than Fe/SBA-15.
Journal: Applied Catalysis A: General - Volumes 423–424, 7 May 2012, Pages 146–153