|Statement||G. Chene ; supervised by B.H. Sakakini.|
|Contributions||Sakakini, B. H., Chemistry.|
Novel Utilization of Mesostructured Cellular Silica Foams as Support for Cobalt Catalysts in FischerTropsch Synthesis. Explanations of the Formation of Products during FischerTropsch Synthesis over Iron Catalysts. Davis deactivation decrease EXAFS Fischer-Tropsch catalysts Fischer-Tropsch synthesis formation fraction FT reactions. The effects of using D 2 rather than H 2 during Fischer-Tropsch synthesis were investigated using alumina- and silica-supported Ru catalysts. For the alumina-supported catalysts, the rate of CD 4 formation was to times faster than the formation of CH 4.A noticeable isotope effect was also observed for higher molecular weight products. Selective synthesis of mixed alcohols from syngas (CO + H 2) via Fischer–Tropsch synthesis (FTS) is an alternative one-step one-pot we report a series of Co-based catalysts supported by activated carbon (AC) and promoted by Mn and La, namely, CoxMnyLa/AC, over which the selectivity to alcohols is usually ∼% and up to % at elevated reaction pressure, accompanied by a. The effect of H bonded and isolated silanol groups on the metal support interactions of SiO 2-supported Co catalysts in Fischer-Tropsch (FT) synthesis are 2 supports were pre-treated in order to improve the concentration of isolated SiOH on the surface of the SiO ed SiOH groups act as an aid to achieving relatively good metal dispersions by creating metal anchoring sites.
The catalytic performance in Fischer–Tropsch synthesis was attributed to iron carbide. Higher Fischer–Tropsch reaction rates, higher olefin, and C 5+ selectivity were observed over larger pore iron catalysts. High dispersion of iron oxide in small-pore silicas was not favorable for carbon monoxide hydrogenation because of poor iron. The effects of support properties including pore size, hydroxyl group concentration, and support stabilizer were investigated for six alumina-supported FeCuK Fischer–Tropsch catalysts containing 20% or 40% iron. Catalysts were supported on one of four aluminas stabilized with La 2 O 3 or SiO 2. A large pore support was found to accommodate The conversion of CO2 over a CoPt/Al2O3 catalyst was investigated. Single-gas adsorption studies indicated that carbon was deposited on the catalyst by exposure to both CO2 and CO in the absence of H2 cofeed. When CO2 was preadsorbed followed by H2 flow, methane was produced, as well as traces of C3–C4 hydrocarbons, but no evidence of the reverse water gas shift reaction was found. Use was. By designing experimental methods, the modeling of hydrocarbon selectivity and CO conversion of the Fischer Tropsch synthesis over Co-based catalyst on a SiO 2 support has been investigated in this study. The variable parameters for modeling consisted of a total pressure between 10 and 25 bar, temperature range of – K, and space.
Fischer−Tropsch synthesis was carried out in slurry phase over cobalt-based catalysts supported on mesoporous metallo-silicates prepared by the rapid room-temperature synthesis method. The incorporation of Al and Ti into the silica framework was confirmed by NMR, FT-IR, and UV. Although the catalyst supported on mesoporous silica (MPS) was deactivated during the reaction, the catalysts. Support materials have an important role in Fischer–Tropsch synthesis (FTS) catalyst and are influenced by various factors. In this paper, the effects of silica augmentation to γ-Al2O3 supported cobalt material on morphology and performance of catalyst have been studied. A series of catalysts, contain 0, 5, 10, and 15 wt % SiO2, were prepared using the incipient wetness impregnation method. The surface chemistry of silica support is discussed. Silanol functional groups in silicon chemistry are explained extensively. The catalyst formulation in the Fischer Tropsch (F-T) process as. Transition-metal oxides and noble metals are well-known selectivity and activity promoters in cobalt-based Fischer–Tropsch catalysis. Niobia has been shown as an effective selectivity promoter as support material; however, its low porosity limits the cobalt loading. To combine the selectivity-promoting properties of niobia with a highly porous support, niobia-modified silica was prepared and.