The Gas-to-Liquid Fischer-Tropsch process is an industrial process that converts syngas, a mixture of H2/CO characterized by a molar ratio equal to 2, into hydrocarbons in the range C1-C100 . A monometallic 10%wtCo and bimetallic 10%wtCo - 0.1%wtRu based catalysts supported on silica were prepared by Flame Spray Pyrolysis (FSP), chatacterized by BET, SEM, TEM, TPR, XRD and tested at different temperature in a FT bench scale plant using a Packed Bed Reactor (PBR). FSP technique allows to obtain single or mixed metal oxides with an high surface area and high thermal stability thanks to the dispersion, vaporization and flame-decomposition (pyrolysis) of the precursors solution . The solution is composed of Co(CH3COO)2·4H2O (Fluka), Si(OC2H5)4 (Fluka) dissolved in a 1/1 mixture of CH3CH2COOH (Fluka)/C8H10 (Sigma Aldrich). The synthesis of the bimetallic catalyst starts with FSP followed by the addition of an impregnation step of Ru using Ru3(CO)12 (Sigma Aldrich) as a precursor. Selectivity T(ᵒC) %CO C2+ CO2 CH4 <C7 >C7 Co 245 255 260 23.4 60.7 98.8 20.4 54.0 82.0 1 1 6 12 10 11 10 10 10 77 79 73 Co-Ru 225 230 245 55.8 73.2 94.5 50.2 65.1 77.5 1 2 6 9 9 12 18 17 14 72 72 68 The TPR profiles (Figure 1) of both samples show two different peaks; the first one at T= 320-360°C is related to the transition Co3O4CoO and the second at T= 700-800°C is attributable to the reduction step CoOCo ; Figure 1 also highlight that the insertion of Ru decrease both peaks temperatures of about 20°C. The samples have been reduced in situ at T= 400°C and then tested at different temperature in the range T= 225-260°C at P= 2.0 MPa, H2/CO= 2 with sl/h/gcat= 3.0. The catalytic results summarized in Table 1 show that the bimetallic catalyst is more active in therms of CO conversion and C2+yeld if compared with the monometallic one, nevertheless the unpromoted catalyst shows selectivity to >C7 higher respect to the Ru-doped catalyst. Finally, the selectivity toward the reaction products is not largely influenced in the range of temperature tested. Reference  Q. Zhang, J. Kang, Wang Y, Chem. Cat. Chem. 2010, 2, 1030.  H. Jang, C. Seong, Y. Suh, H. Kim, C. Lee C, Sci. and Tech. 2004, 38, 1027.  C. Pirola, C.L. Bianchi, A. Di Michele, S. Vitali, V. Ragaini, Cat. Comm. 2009, 10, 823.
Flame Spray Pyrolysis Synthesized Co and Co/Ru Based Catalysts for the Thermochemical GTL : Fischer Tropsch Process / A. Comazzi, C. Pirola, A. Di Michele, M. Compagnoni, F. Galli, S. Cane, F. Manenti, I. Rossetti, C.L. Bianchi. ((Intervento presentato al 23. convegno Topical conference about “Synthesis gas chemistry” tenutosi a Dresden nel 2015.
|Titolo:||Flame Spray Pyrolysis Synthesized Co and Co/Ru Based Catalysts for the Thermochemical GTL : Fischer Tropsch Process|
|Data di pubblicazione:||2015|
|Settore Scientifico Disciplinare:||Settore ING-IND/25 - Impianti Chimici|
|Citazione:||Flame Spray Pyrolysis Synthesized Co and Co/Ru Based Catalysts for the Thermochemical GTL : Fischer Tropsch Process / A. Comazzi, C. Pirola, A. Di Michele, M. Compagnoni, F. Galli, S. Cane, F. Manenti, I. Rossetti, C.L. Bianchi. ((Intervento presentato al 23. convegno Topical conference about “Synthesis gas chemistry” tenutosi a Dresden nel 2015.|
|Appare nelle tipologie:||14 - Intervento a convegno non pubblicato|